[tex]\text{Li}^{2+} \; (g) \to \text{Li}^{3+} \; (g)+ \text{e}^{-}[/tex]
ExplanationIonization energy is what it takes to free one mole of electrons from one mole of gaseous atoms or ions.
The first ionization energy takes electrons away from a neutral atom. The atom here has to be gaseous.
[tex]\text{Li}^{} \; (g) \to \text{Li}^{+} \; (g)+ \text{e}^{-}[/tex]
The second ionization energy removes one electron from the [tex]\text{Li}^{+}[/tex] ion. The ion shall also be gaseous.
[tex]\text{Li}^{+} \; (g) \to \text{Li}^{2+} \; (g)+ \text{e}^{-}[/tex]
Removes one more electron. Doing so will convert the [tex]\text{Li}^{2+} \; (g)[/tex] ion to a gaseous [tex]\text{Li}^{3+}[/tex].
[tex]\text{Li}^{2+} \; (g) \to \text{Li}^{3+} \; (g) + \text{e}^{-}[/tex].
The process above removes the third electron from lithium. Its energy change is the third ionization energy of this element.
The chemical equation representing the third ionization energy for lithium is;
[tex]Li^{2+} + e^{-} -----> Li^{3+}[/tex]
Ionization is the loss of electrons. The energy required for electrons to be lost is called the ionization energy.
For an atom having n electrons, there can be n number of ionization energies as electrons are successively lost from the atom.
The equation showing the third ionization energy of lithium has been shown above.
Learn more: https://brainly.com/question/16243729
the equation below shows the decomposition of lead nitrate. how many grams of oxygen are produced when 11.5g NO2 is formed?
2Pb(NO3)2(s) -> 2PbO(s) + 4NO2(g) + O2(g)
a. 2.88 g
b. 2.00 g
c. 32.0 g
d. 1.00 g
PLEASE AND THANK YOU IN ADVANCE
Final answer:
2.00 g of oxygen is produced ,option B
Explanation:
To determine how many grams of oxygen are produced when 11.5 g of NO2 is formed, we can use the stoichiometry of the balanced chemical equation:
2 Pb(NO3)2(s) = 2 PbO(s) + 4 NO2(g) + O2(g)
From the equation, we see that 4 moles of NO2 are produced alongside 1 mole of O2. First, we find the number of moles of NO2 that 11.5 g corresponds to:
Molar mass of NO2 = 14.01 (N) + (2 *16.00) (O) = 46.01 g/mol
Moles of NO2 = 11.5 g / 46.01 g/mol
Then, we take into account the mole ratio between NO2 and O2, which is 4:1:
Moles of O2 = (Moles of NO2) times (1 mole O2 / 4 moles NO2)
Finally, we find the mass of O2 produced:
Molar mass of O2 = 2 times 16.00 g/mol = 32.00 g/mol
Mass of O2 = (Moles of O2) times (32.00 g/mol)
By going through the calculations, we find that the mass of O2 produced is 2.00 g, which corresponds to option (b).
HELP PLS !!! :) Based on valence electron configurations, which of the following is the accurate formula for a compound formed from sodium (Na) and oxygen (O)?(Note: All numerical values below are subscripts) *
Answer: The accurate formula is [tex]Na_2O[/tex].
Explanation: Atomic no of Sodium is 11. The electronic configuration is:
Na: [tex]1s^22s^22p^63s^1[/tex]
Atomic no of Oxygen is 8. The electronic configuration is:
O: [tex]1s^22s^22p^4[/tex]
Thus sodium needs to lose one electron in order to attain noble gas configuration and Oxygen needs to gain two electrons to attain noble gas configuration.
Thus Na will lose one electron to form [tex]Na^+[/tex] and Oxygen gain two electrons to form [tex]O^{2-}[/tex]. In order to form a stable neutral compound, two sodium ions are required.
Thus the formula will be [tex]Na_2O[/tex].
The study of chemicals is called chemistry. There are two types of solution in the chemistry and these are acid and base.
The correct answer is [tex]Na_2O[/tex]
What are moles?
The mole is the base unit of the amount of substance in the International System of Units.It is defined as exactly 6.02214076×10²³ elementary entities, which may be atoms, molecules, ions, or electrons.Thus sodium needs to lose one electron in order to attain noble gas configuration and Oxygen needs to gain two electrons to attain noble gas configuration.
Thus Na will lose one electron to form [tex]Na^+[/tex] and Oxygen gain two electrons to form[tex]O^{-2}[/tex] In order to form a stable neutral compound, two sodium ions are required.
Thus the formula will be [tex]Na_2O[/tex].
For more information, refer to the link:-
https://brainly.com/question/15209553
Which of these is a renewable resource? A) Gasoline that contains some alcohol B) Wind produced by the uneven heating of Earth's surface C) Natural gas pumped from deep underground D) None of these
Answer is: B) Wind produced by the uneven heating of Earth's surface.
Gasoline is a mixture of many different hydrocarbons: alkanes (paraffins), cycloalkanes and alkenes (olefins). It is not renewable resource, because every year is less and less gasoline.
Natural gas is usualy methane, it is not renewable recourse.
Wind consists of the bulk movement of air.
Final answer:
Wind produced by the uneven heating of Earth's surface is the renewable resource among the options provided.
Explanation:
Among the listed options, the renewable resource is B) Wind produced by the uneven heating of Earth's surface. Renewable energy sources such as wind can be replenished within a human timescale and do not deplete. Gasoline, even if it contains some alcohol, is not renewable because it is derived from petroleum which is a finite resource. Natural gas, while it may be used alongside renewable resources, is also non-renewable as it cannot be replenished within a human timescale once it's extracted from deep underground.
Find the mass of liquid water required to absorb 5.23 × 104 kJ of energy on boiling.
The mass of water required to absorb 5.23 × 10⁴ kJ of energy during boiling is approximately 23.2 kg.
Explanation:To find the mass of liquid water required to absorb a specific amount of energy during boiling, one can use the formula Qv = mLv, where Qv is the energy (in this case 5.23 × 10⁴ kJ), m is the mass we need to find, and Lv is the latent heat of vaporization, which for water is 2256kJ/kg.
Rearranging the formula to get mass, we find m = Qv/Lv. We substitute given values and calculate the mass.
So, m = (5.23 × 10⁴ kJ) / (2256 kJ/kg) = 23.2 kg (approximately).
This means that approximately 23.2 kg of water is required to absorb 5.23 × 10⁴ kJ of energy on boiling.
Learn more about Absorption here:https://brainly.com/question/12943685
#SPJ3
The mass of liquid water required to absorb 5.23 × 10⁴ kJ of energy on boiling is approximately 23.14 kg.
The latent heat of vaporization of water is approximately 2260 kJ/kg.
The formula to calculate the mass (m) of the water is:
[tex]\[ Q = m \times L \][/tex]
where:
- Q is the amount of energy absorbed (in kJ),
- m is the mass of the water (in kg),
- L is the latent heat of vaporization (in kJ/kg).
Given:
[tex]\[ Q = 5.23 \times 10^4 \text{ kJ} \]\[ L = 2260 \text{ kJ/kg} \][/tex]
We need to find m.
Rearranging the formula to solve for m:
[tex]\[ m = \frac{Q}{L} \][/tex]
Substitute the given values:
[tex]\[ m = \frac{5.23 \times 10^4 \text{ kJ}}{2260 \text{ kJ/kg}} \][/tex]
Perform the calculation:
[tex]\[ m = \frac{52300 \text{ kJ}}{2260 \text{ kJ/kg}} \]\[ m \approx 23.14 \text{ kg} \][/tex]
calculate the enthalpy change when 4.00 mol Cl2O7 is produced according to the following balanced equation:
2Cl2(g) + 7O2(g) + 130kcal -> 2Cl2O7(g)
a. 1040 kcal
b. -260 kcal
c. 260 kcal
d. -1040 kcal
** if you could explain it as well, that would be much appreciated !! if not, thats okay too its multiple choice
So the equation is,
2Cl2(g) + 7O2(g) + 130kcal -> 2Cl2O7(g)
from this , ΔH°rxn=[tex]130kcal.mol^{-1}[/tex]
[tex]mol^{-1}[/tex] is mentioned because it is for per mole of reaction. So for 4. moles of the product [tex]2Cl_{2} O_{7}[/tex] we need 4/2 moles of reaction to be used to calculate associated enthalphy change for the reaction.
Therefore[tex]4/2*130=260 kcal[/tex]
One of a kind static electricity is a result of electrons moving into an object from another object. What is another way static electricity can build up in an object?
Another way static electricity can build up in an object is induction. Induction is the transfer of electrons from one part of an object to another part, caused by the electric field of another object, without the two objects touching.
How many electrons does boron lose when forming a ion?
A. 1
B. 2
C. 3
D. 4
(NOT D)
(Answer) (C) 3
Boron is a non-metal with atomic number 5. The electronic configuration of boron atom is [He]2s^22p^1.
Boron atom has the tendency to obtain stable electronic configuration like its nearest noble gas helium by losing electrons. Boron atom usually loses 3 electrons from its outermost electronic shell to form a cation with +3 charge.
Therefore, boron atom loses 3 electrons while forming an ion.
A 0.1326 g sample of magnesium was burned in an oxygen bomb calorimeter. the total heat capacity of the calorimeter plus water was 5,760 j/°c. if the temperature rise of the calorimeter with water was 0.570°c, calculate the enthalpy of combustion of magnesium. mg(s) + 1/2o2(g) →mgo(s)
The enthalpy of combustion of magnesium in this experiment is approximately -602 kJ/mol, which was determined by dividing the total heat transferred (calculated from the calorimeter's heat capacity and temperature change) by the number of moles of magnesium burnt.
Explanation:
In the experiment described, a small piece of magnesium was burnt in a oxygen bomb calorimeter, leading to a recorded temperature rise in the calorimeter and the water it contains. The enthalpy of combustion of magnesium can be determined from these values by using the equation q = mcΔT, where q is the heat transferred, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. In this case, the total heat transferred (q) is the heat capacity of the calorimeter and the water times the temperature change, or 5760 J/°C * 0.570 °C = 3283.2 J. The molar enthalpy of combustion can then be calculated by determining the moles of Mg burnt (0.1326 g / 24.305 g/mol = 0.00545 mol) and dividing the heat produced by the moles of Mg burnt (3283.2 J / 0.00545 mol = -602 kJ/mol). Therefore, when rounded to 3 significant figures, the enthalpy of combustion of magnesium is around -602 kJ/mol.
Learn more about Enthalpy of Combustion here:https://brainly.com/question/31292902
#SPJ12
Help me number 16 and 17
16) Chemical equation: Ca + H₃PO₄ → Ca₃(PO₄)₂ + H₂.
Oxidation reaction: Ca⁰ → Ca⁺² + 2e⁻ /×3.
3Ca⁰ → 3Ca⁺² + 6e⁻
Reduction reaction: 6e⁻ + 2H₃⁺¹ → 3H₂⁰.
Calcium change oxidation number from 0 to +2 (oxidation) and hydrogen change oxidation number from +1 to 0 (reduction).
Balanced chemical equation: 3Ca + 2H₃PO₄ → Ca₃(PO₄)₂ + 3H₂.
Calcium is stronger reducing agent than hydrogen, gives electrons easier.
This is example of single displacement reaction.
Single displacement is reaction where neutral element metal or nonmetal become an ion as it replaces another ion in a compound.
17) Balanced chemical equation:
3Ca(s) + 2H₃PO₄(aq) → Ca₃(PO₄)₂(aq) + 3H₂(g).
Ionic equation: 3Ca + 6H⁺ + 2PO₄³⁻ → 3Ca²⁺ + 2PO₄³⁻ + 3H₂.
Net ionic equation: 3Ca + 6H⁺ → 3Ca²⁺ + 3H₂.
A spectator ion is an ion that exists as a reactant and a product in a chemical equation.
A spectator ion is phospate anion PO₄³⁻.
If a neutral atom loses electrons, what type of particle is formed?
A.
a positively charged ion
B.
an isotope
C.
a negatively charged ion
D.
a new element
If a neutral atom loses electrons, type of particle which is formed is a positively charged ion.
What is an ion?
An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.
Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions . They are very reactive in their gaseous state and rapidly react with oppositely charged ions resulting in neutral molecules.
Ions combine which are of opposite charges to form an ionic compound which are hard and good conductors of electricity.
Learn more about ions,here:
https://brainly.com/question/29183072
#SPJ5
Which of the following statements about energy in systems is true? Energy can be transferred or transformed inside or outside of a system, but energy cannot be destroyed. The total amount of energy in a system must be equal to the total amount of matter in that system. When energy is transferred or transformed within a system, some matter must be changed into energy so that the total amount of energy remains constant.
According to first law of thermodynamics, energy can neither be formed nor be destroyed but can be converted from one form to another.
thus the statement that Energy can be transferred or transformed inside or outside of a system, but energy cannot be destroyed, is true statment.
Answer:
Energy can be transferred or transformed inside or outside of a system, but energy cannot be destroyed.
Explanation:
A popular principle in science is known as the principle of conservation of energy. It states that energy cannot be created nor destroyed but can be converted from one form to another.
In a system, energy transformations are possible and does happen though inefficiently according to the laws of thermodynamics but energy can never be destroyed following the laws of thermodynamics.
The salts NaCl and CaCl2
(a) are good conductors of electricity
(b) have positive charges
(c) have the same crystal lattice of energy
(d) are held together by ionic bond
Answer: The correct answer is Option a and d.
Explanation: Both the salts are ionic in nature because when dissolved in water, they dissociate into their respective ions.
Ionic compounds are held together by ionic bond. They are neutral compounds as both positive and negative charges neutralize each other. These compounds are also good conductors of electricity because of the presence of ions.
As both the salts have different molecular formula, both of them will have different crystal lattice system and hence, different crystal lattice energy.
From the above information, the correct options are option a and option d.
Answer:
D
Explanation:
both a and b
that i a correct
answer
The element bromine, Br, has a larger atomic radius than A) Cu, O and Ba B) I, Cu, and Ba C) F and Kr D) O, F, and Kr
The answer is: D) O, F, and Kr.
Atomic radius of bromine (Br) is 114 pm.
Atomic radius of oxygen (O) is 73 pm.
Atomic radius of fluorine (F) is 72 pm.
Atomic radius of krypron (Kr) is 112 pm.
The atomic radius of a chemical element is a measure of the size of its atom.
The atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.
The atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.
What is the total magnification with two lenses when one lens has a magnification or 15, and the other lens has a magnification of 30?
Given that Cu + 2HCI Cu2+ + 2CI- + H2(g) has an overall reduction potential of –0.34 V, what is a valid prediction about how this reaction works? The reaction is not spontaneous and will require energy to proceed. The reverse reaction would require energy input in order to occur. The half reactions would both occur spontaneously. The reaction is not spontaneous, and it is impossible to make it occur.
Cu + 2HCI → Cu²⁺ + 2CI⁻ + H2(g)
has an overall reduction potential of –0.34 V
The correct option is:
The reaction is not spontaneous and will require energy to proceed.
Since the overall reduction potential is negative,the reaction is not spontaneous and it requires energy to proceed.
The reaction is
Cu(s) + 2HCI(aq) ---> Cu⁺² + 2CI⁻ + H₂(g)
The given E⁰cell = -0.34
The overall reduction potential is negative
A reaction is said to be spontaneous it is ΔG° is negative
The relation between ΔG° and Electrode potential is
ΔG° = -nFE°cell
as given that
E°cell = -0.34 V
The overall value of ΔG° will be positive and hence reaction must be non spontaneous
so
The reaction is not spontaneous and will require energy to proceed.
Question 1(Multiple Choice Worth 4 points) (04.05 LC) What is the oxidation number of manganese in MnO41−? +3 +4 +7 +8 Question 2(Multiple Choice Worth 4 points) (04.05 LC) Which of the following reactions could be used to power a battery because of the transfer of electrons? Pb22+ + 2Br− → PbBr CaCl2 + 2NaOH → Ca(OH)2 + 2NaCl KOH + HCl → KCl + H2O Zn + Cu2+ → Zn2+ + Cu Question 3(Multiple Choice Worth 4 points) (04.05 MC) Read the following chemical equation: 2Al + 3Br2 → 2AlBr3 Which statement best identifies and describes the oxidizing agent in the reaction? Al is the oxidizing agent because its oxidation number increases. Al is the oxidizing agent because its oxidation number decreases. Br2 is the oxidizing agent because its oxidation number increases. Br2 is the oxidizing agent because its oxidation number decreases. Question 4(Multiple Choice Worth 4 points) (04.05 MC) In which of the following reactions is chlorine (Cl) oxidized? Br2 + 2Cl− → Cl2 + 2Br− Cl2 + 2e− → 2Cl− 2ClO3− + 12H+ → Cl2 + 6H2O 2Na + Cl2 → 2NaCl Question 5(Multiple Choice Worth 4 points) (04.05 MC) The diagram shows the setup of an experiment. A few observations of the experiment are listed in the table below the diagram. A beaker filled three-fourths with a liquid labeled colorless silver nitrate solution is shown. A small strip is shown inside the beaker. The strip is labeled copper strip. The title of the image is Experimental Setup. Experimental Observations Observation Description 1 Solution turned blue 2 Gray particles were deposited on the edge of the strip Which of the following is the correct explanation for one of the given observations? Observation 2 is a result of nitrate ions moving into the solution. Observation 1 is a result of copper ions moving into the solution. Observation 1 is a result of silver atoms losing one electron. Observation 2 is a result of silver ions losing one electron.
1) Answer is: the oxidation number of manganese in MnO₄⁻ is +7.
Permanganate anion has negative charge 1-.
Oxygen (O) in permanganate anion has oxidation number -2.
x + 4 · (-2) = -1.
x - 8 = -1.
x = +7; oxidation nzmber of manganese.
Oxidation number shows the degree of oxidation of an atom in a chemical compound.
2) Answer is: Zn + Cu2+ → Zn2+ + Cu.
In this chemical reaction, there is transfer of electrons from zinc (Zn) to copper (Cu). Zinc change oxidation number from 0 to +2 (lost electrons) and copper change oxidation number from +2 to 0 (gain electrons).
Oxidation half reaction: Zn⁰ → Zn²⁺ + 2e⁻.
Reduction half reaction: Cu²⁺ + 2e⁻ → Cu⁰.
In other chemical reactions, there is no change of oxidation number of elements.
3) Answer is: Br2 is the oxidizing agent because its oxidation number decreases.
Balanced chemical reaction: 2Al + 3Br₂ → 2AlBr₃.
In this chemical reaction, aluminium change oxidation number from 0 to +3 (lose electrons) and bromine change oxidation number from 0 to -1 (gain electrons, reduced).
Oxidizing agent is a substance that has the ability to oxidize other substances, to cause them to lose electrons.
In oxido-reduction reaction, at least one element lose and one element gain electrons.
4) Answer is: Br2 + 2Cl− → Cl2 + 2Br⁻.
Oxidation is increase of oxidation number.
In this balanced chemical reaction, chlorine change oxidation number from -1 (Cl⁻) to oxidation number 0 (Cl₂).
Oxidation half reaction: 2Cl⁻ → Cl₂⁰ + 2e⁻.
Reduction half reaction: Br₂ + 2e⁻ → 2Br⁻.
In other chemical reactions, chlorine is reduced.
5) Answer is: Observation 1 is a result of copper ions moving into the solution.
The reactivity series is a series of metals from highest to lowest reactivity. Metal higher in the reactivity series will displace another.
Copper (Cu) is higher in activity series than silver (Ag), so copper lose electron and silver gain electrons.
Copper is oxidized (increase of oxidation number) and silver is reduced.
The oxidation number of manganese in MnO4− is +7. A reaction that can power a battery is Zn + Cu2+ → Zn2+ + Cu. Chlorine is oxidized in the reaction 2ClO3− + 12H+ → Cl2 + 6H2O, and observation 1 in an experiment with copper and silver nitrate indicates copper ions moving into the solution.
Explanation:The oxidation number of manganese in MnO4− is +7. In this compound, oxygen has a typical oxidation state of -2, and because the compound has an overall charge of -1, the oxidation number of manganese can be calculated using the equation: Mn + 4(×-2) = -1, which gives Mn a oxidation state of +7.
The reaction that could be used to power a battery is Zn + Cu2+ → Zn2+ + Cu. In this redox reaction, zinc is oxidized, going from Zn to Zn2+, and copper is reduced, going from Cu2+ to Cu, allowing for the transfer of electrons necessary to generate electric current.
The oxidizing agent in the reaction 2Al + 3Br2 → 2AlBr3 is Br2, because it is reduced, with its oxidation number decreasing from 0 in Br2 to -1 in AlBr3.
Chlorine (Cl) is oxidized in the reaction 2ClO3− + 12H+ → Cl2 + 6H2O. Here, the chlorine goes from an oxidation state of +5 in ClO3− to 0 in Cl2.
The correct explanation for one of the observations in the experiment with the silver nitrate solution and the copper strip is that Observation 1 is a result of copper ions moving into the solution. When the copper strip is placed in the silver nitrate solution, it undergoes oxidation, and Cu atoms lose electrons to form Cu2+ ions, which then cause the solution to turn blue.
Complete combustion of a compound containing hydrogen and carbon produced 2.641 g of carbon dioxide and 1.442 grams of water as the only products. the molar mass of the hydrocarbon is 88.1 g/mol. what are the empirical and molecular formulas?
The empirical formula of hydrocarbon is C₃H₈
The molecular formula of hydrocarbon is C₆H₁₆
Empirical formula calculation
Hydrocarbon contain carbon and hydrogen
Step 1: find the mass carbon (C) in carbon dioxide (CO₂) and hydrogen (H ) in water
mass of of element = molar mass of element/ molar mass molecule x total mass of molecule
From periodic table the molar mass of C =12, for CO₂ = 12+( 16 x2) =44 g/mol, for H = 1.00 g/mol, for H₂O = (2 x1)+16 = 18 g/mol
mass of C = 12/44 x 2.641 =0.7203 g
since there are 2 atom of H in H₂O the molar mass of H = 1 x2 = 2 g/mol
mass of H is therefore = 2/18 x 1.442 =0.1602 g
Step 2: find the moles of C and H
moles = mass÷ molar mass
moles of C = 0.7203 g÷ 12 g/mol = 0.060 moles
moles of H = 0.1602÷ 1 g/mol = 0.1602 moles
Step 3: find the mole ratio of C and H by dividing each mole by smallest mole ( 0.06)
for C = 0.06/0.06 =1
For H = 0.1602/0.06 =2.67
multiply by 3 to remove the decimal
For C = 1 x3 =3
For H = 2.67 x3 =8
therefore the empirical formula = C₃H₈
The molecular formula calculation
[C₃H₈]n = 88.1 g/mol
[12 x 3)+( 1 x8)]n =88.1 g/mol
44 n = 88.1
divide both side by 44
n=2
therefore [C₃H₈]₂ = C₆H₁₆
1) Answer is: the empirical formula of the hydrocarbon is C₃H₈.
Chemical reaction: CₓHₐ + O₂ → xC + a/2H₂O.
m(CO₂) = 2.641 g.; mass of carbon dioxide.
n(CO₂) = m(CO₂) ÷ M(CO₂).
n(CO₂) = 2.641 g ÷ 44.01 g/mol.
n(CO₂) = n(C) = 0.06 mol; amount of carbon.
m(H₂O) = 1.442 g.
n(H₂O) = 1.442 g ÷ 18 g/mol.
n(H₂O) = 0.08 mol.
n(H) = 2 · n(H₂O) = 0.16 mol; amount of hydrogen.
n(C) : n(H) = 0.06 mol : 0.16 mol /0.06 mol.
n(C) : n(H) = 1 : 2. 67 /×3.
n(C) : n(H) = 3 : 8.
2) Answer is: the molecular formula of hydrocarbon is C₆H₁₆.
M(C₃H₈) = 44.05 g/mol; molar mass of empirical formula.
M(CₓHₐ) = 88.1 g/mol; molar mass of hydrocarbon.
M(CₓHₐ) ÷ M(C₃H₈) = 88.1 g/mol ÷ 44.05 g/mol.
M(CₓHₐ) ÷ M(C₃H₈) = 2.
The molar mass of hydrocarbon is two times higher than molar mass of empirical formula, so number of carbon atoms is six and number of hydrogen atoms sixteen.
*I think it’s either the first one or the last one, but I’m just not sure.
Nitrogen dioxide gas is dark brown in color and remains in equilibrium with dinitrogen tetroxide gas, which is colorless.
2NO2(g) ⇌ N2O4(g)
When the light brown color equilibrium mixture was moved from room temperature to a lower temperature, the mixture turned lighter brown in color. Which of the following conclusions about this equilibrium mixture is true?
This reaction is endothermic because the system shifted to the left on cooling.
This reaction is endothermic because the system shifted to the right on cooling.
This reaction is exothermic because the system shifted to the left on cooling.
This reaction is exothermic because the system shifted to the right on cooling.
Answer:
This reaction is exothermic because the system shifted to the right on cooling.
Step-by-step explanation:
2NO₂ ⇌ N₂O₄
brown colourless
According to Le Châtelier's Principle, when a stress is applied to a system at equilibrium, the system will respond in a way that tends to relieve the stress.
You applied a stress by cooling the system (removing heat). The system responded by moving in a direction that created more heat.
The mixture became lighter brown on cooling, so the position of equilibrium must have shifted to the right to generate the heat.
The reaction is exothermic.
When the light brown color equilibrium mixture was moved from room temperature to a lower temperature, the mixture turned lighter brown in color shows this reaction is exothermic because the system shifted to the right on cooling.
What is equilibrium law?According the the equilibrium law, if any external element is added in the equilibrium state, ten the whole reaction will shifts to that side which reduces the effect of that additional element.
Given chemical reaction is:
2NO₂(g) ⇌ N₂O₄(g)
Where NO₂ shows brown color and N₂O₄ is colorless gas. If we notice a light brown color of the mixture when we moved from room temperature to a lower temperature then the reaction will shifts to the right side and will show exothermic behavior to overcome the external effect.
Hence, option (d) is correct.
To know more about equilibrium law, visit the below link:
https://brainly.com/question/2943338
Which electrons in a calcium atom in the ground state have the greatest effect on the chemical properties of calcium
Answer is: the two electrons in the fourth shell.
Atomic number of calcium is 20, it means that it has 20 protons and 20 electrons, so atom of calcium is neutral.
Electron configuration of calcium atom: ₂₀Ca 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²; calcium has two valence electrons (4s²).
In reactions it lose those two electrons ang form cation with positive charge 2+.
Atomic number is the number of protons, which is characteristic of a chemical element.
Beryllium, magnesium,calcium and strontium are alkaline earth metals. The elements have very similar properties.
Alkaline earth metals have in common an outer s- electron shell (two electrons).
Kevin has 5 fish in his fish tank jasmine has 4 times as many fish as Kevin.How many fish does jasmine have?
The tropopause is best described as which of the following?
The lowest layer of Earth's atmosphere is called troposphere.The layer immediately next to troposphere is called Stratosphere. The boundary layer between troposphere and stratosphere is described as tropopause.
The tropopause is the transition layer between the troposphere and the stratosphere in Earth's atmosphere. It is located at an altitude of about 12-15 km, and it is the coldest part of the atmosphere.
Explanation:The tropopause can be defined as the transition layer between the troposphere and the stratosphere in Earth's atmosphere. It is located at an altitude of about 12-15 km (7-8 miles), and it is the coldest part of the atmosphere. The temperature in the troposphere decreases steadily with increasing altitude, but at the tropopause, the temperature starts warming again due to the absorption of UV radiation by ozone in the stratosphere.
How many moles of gas are there in a 45.0 L container at 25.0 °C and 500.0 mm Hg?
You can solve this by utilizing the ideal gas law, PV=nRT. P is pressure, V is volume, n is the number of moles, R is a constant (depends on the unit of pressure), and T is the temperature (in Kelvins).
500.0mmHg- convert to atm
=0.65789atm (do sig figs last)
25.0 C- convert to K
25.0 +273= 298K
PV=nRT
0.65789atm times 45.0L equals n (the variable) times R (0.08206L atm mol^-1 K^-1) times 298K
Isolate the variable, n and plug into a calculator.
I hope this helped!
Answer: The moles of gas is 1.21 moles.
Explanation:
To calculate the moles of gas, we use the equation given by ideal gas which follows:
[tex]PV=nRT[/tex]
where,
P = pressure of the gas = 500.0 mmHg
V = Volume of the gas = 45.0 L
T = Temperature of the gas = [tex]25^oC=[25+273]K=298K[/tex]
R = Gas constant = [tex]62.364\text{ L.mmHg }mol^{-1}K^{-1}[/tex]
n = number of moles of gas = ?
Putting values in above equation, we get:
[tex]500.0mmHg\times 45.0L=n\times 62.3637\text{ L.mmHg }mol^{-1}K^{-1}\times 298K\\\\n=\frac{500.0\times 45.0}{62.364\times 298}=1.21mol[/tex]
Hence, the moles of gas is 1.21 moles.
Question 1 (True/False Worth 2 points)
(04.03 LC)
When Pb and AlCl3 react together, lead (Pb) can replace aluminum (Al) in the compound because lead is lower on the activity series.
True
False
Question 2(Multiple Choice Worth 4 points)
(04.03 MC)
Which of the following equations has the correct products and is balanced correctly for a reaction between Na3PO4 and KOH?
Na3PO4 + 3KOH → 3NaOH + K3PO4, because K retains the same charge throughout the reaction
Na3PO4 + KOH → Na3OH + KPO4, because K increases in charge from 1+ to 3+ when it is replaced
Na3PO4 + KOH → 3NaOH + K3PO4, because K retains the same charge throughout the reaction
Na3PO4 + KOH → Na3OH + K3PO4, because K increases in charge from 1+ to 3+ when it is replaced
Question 3(Multiple Choice Worth 4 points)
(04.03 LC)
Which of the following is a single replacement reaction?
Ba(OH)2 + H2SO4 → BaSO4 + 2H2O
2Mg + O2 → 2MgO
H2O+ CO2 → H2CO3
Zn + H2SO4 → ZnSO4 + H2
Question 4(Multiple Choice Worth 4 points)
(04.03 MC)
Sodium metal reacts with water to produce hydrogen gas.
What best describes this reaction?
A single replacement reaction takes place because sodium is less reactive than hydroxide ions.
A double replacement reaction takes place because sodium is less reactive than hydroxide ions.
A double replacement reaction takes place because sodium is more reactive than hydrogen.
A single replacement reaction takes place because sodium is more reactive than hydrogen.
Question 5 (True/False Worth 2 points)
(04.03 LC)
A single replacement reaction is a reaction in which one element replaces a similar element within a compound.
True
False
Question 6(Multiple Choice Worth 4 points)
(04.03 MC)
The table shows the nature of reactants and products formed in a certain type of chemical reaction.
Nature of Reactants and Products
Reactants Products
Metal + Ionic compound Metal + Ionic compound
Which of the following is true about the type of chemical reaction?
It is a single replacement reaction, and the anions in the two ionic compounds are different.
It is a single replacement reaction, and the cations in the two ionic compounds are different.
It is a double replacement reaction, and the anions in the two ionic compounds are different.
It is a double replacement reaction, and the cations in the two ionic compounds are different.
1) Answer is: False.
Balanced chemical reaction: Pb + AlCl₃ → no reaction.
The reactivity series is a series of metals from highest to lowest reactivity. Metal higher in the reactivity series will displace another.
Aluminium (Al) is higher in activity series than lead (Pb).
That means aluminium (Al) is stronger reducing agent than lead and gives electrons easier.
This series are used to summarize information about the reactions of metals with acids or water, double displacement reactions (more reactive metals displace metals with lower reactivity) and the extraction of metals from their ores.
2) Answer is: Na3PO4 + 3KOH → 3NaOH + K3PO4, because K retains the same charge throughout the reaction.
This chemical reaction is double displacement reaction - cations (K⁺ and Na⁺) and anions (PO₄³⁻⁻ and OH⁻) of the two reactants switch places and form two new compounds.
Na₃PO₄ is sodium phosphate.
KOH is potassium hydroxide.
NaOH is sodium hydroxide.
K₃PO₄ is potassium phosphate.
3) Answer is: Zn + H2SO4 → ZnSO4 + H2.
Single replacement is reaction where neutral element metal or nonmetal become an ion as it replaces another ion in a compound.
In this balanced chemical reaction zinc (Zn) replaces hydrogen (H).
Zinc changes oxidation number from 0 to +2 (this is oxidation) and hydrogen change oxidation number from +1 to 0 (reduction).
4) Answer is: A single replacement reaction takes place because sodium is more reactive than hydrogen.
Balanced chemical reaction:
2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g).
Single replacement is reaction where neutral element metal or nonmetal become an ion as it replaces another ion in a compound.
In this balanced chemical reaction sodium (Na) replaces hydrogen (H).
Sodium changes oxidation number from 0 to +1 (oxidation) and hydrogen change oxidation number from +1 to 0 (reduction).
5) Answer is: True.
For example, balanced chemical reaction:
Ca + 2HCl → H₂ + CaCl₂.
Reduction hald reaction: 2H⁺ + 2e⁻→ H₂.
Oxidation half reaction: Ca⁰ → Ca²⁺ + 2e⁻.
In this balanced chemical reaction calcium (Ca) replaces hydrogen (H).
In this chemical reaction, calcium lost two electrons (oxidation, change oxidation number from 0 to +2) and hydrogen gain that two electrons (reduction, change oxidation number from +1 to 0).
6) Answer is: It is a single replacement reaction, and the cations in the two ionic compounds are different.
For example, balanced chemical reaction:
Ba + MgSO₄ → BaSO₄(s) + Mg.
In this balanced chemical reaction barium (Ba) replaces magnesium (Mg), because barium is higher at activity series.
Sulfate anion (SO₄²⁻) is the same in two ionic compounds, but cations (Mg²⁺ and Ba²⁺) changes.
Single Displacement is reaction where neutral element metal or nonmetal become an ion as it replaces another ion in a compound.
When the temperature in a room increases from 25c to 33c what changes from a solid to a liquid
Answer:
Gallium
Explanation:
Adding soap to water disrupts the hydrogen bonding between water molecules. A water strider is standing on the surface of a dish of water. What is most likely to happen if a drop of dish soap is added to the water?

The water strider will be able to move more quickly over the water’s surface because of reduced friction.

The water strider will have more difficulty moving its feet because they will be more strongly attracted to the water.

The water strider will be unable to remain on the water’s surface because of the loss of surface tension in the water.
the answer is,
C. The water strider will have more difficulty moving its feet because they will be more strongly attracted to the water.
Answer:
the answer is D. edg. 2020
Explanation:
PLEASE HELP ASAP!!THANKS!
Balance the following and label what type of reaction is taking place:
C5H9O + O2? CO2 + H2O
Balanced chemical reaction:
4C₅H₉O + 27O₂ → 20CO₂ + 18H₂O.
According to principle of mass conservation, number of atoms must be equal on both side of chemical reaction.
Type of reaction is combustion.
Combustion is reaction with oxygen.
Organic compound reacts with oxygen and produce carbon dioxide and water.
Compare the radio waves broadcasts by the two stations, WIL-92.3 and KSHE-94.7
A. Which station broadcasts waves with more energy?
B. Which station broadcasts waves with a shorter wavelength
C. Which stations broadcasts waves with a higher frequency?
The frequency of radio waves at the two stations are:
1. WIL-92.3 : Frequency = 92.3 MHz (mega hertz)
2. KSHE-94.7 : Frequency = 94.7 MHz
The wavelength (λ) and frequency (ν) are related as:
ν = c/λ ------(1)
Energy (E), frequency (ν) and wavelength (λ) are related as:
E = hν -----(2)
(or)
E = hc/λ ----(3)
A) Based on equation (2), higher the frequency higher is the energy. Therefore, station KSHE broadcasts waves with higher energy
B) Based on equation (1), higher the frequency lower will be the wavelength. Station KSHE will broadcast waves with shorter wavelength
C) KSHE will broadcast waves with higher frequency
Station KSHE-94.7 broadcasts waves with more energy, a shorter wavelength, and a higher frequency compared to WIL-92.3, as higher frequencies correspond to more energy and shorter wavelengths.
Explanation:In comparing radio wave broadcasts of WIL-92.3 and KSHE-94.7, we need to consider frequency, energy, and wavelength properties of radio waves. Here is how they relate:
Higher frequency corresponds to greater energy and shorter wavelength.Lower frequency corresponds to lesser energy and longer wavelength.Given that,:
Station KSHE-94.7 broadcasts waves with more energy, since it operates at a higher frequency (94.7 MHz) compared to WIL-92.3.Station KSHE-94.7 broadcasts waves with a shorter wavelength, as shorter wavelengths are associated with higher frequency transmissions.Station KSHE-94.7 broadcasts waves with a higher frequency, as is evident from their respective frequencies - the higher the frequency, the higher the energy of waves.Therefore, all the three properties are higher for KSHE-94.7 as compared to WIL-92.3.
Learn more about Radio Waves here:https://brainly.com/question/32837450
#SPJ3
How many particles are in one mole?
A.
6.022 × 1023
B.
2.066 × 1023
C.
6.023 × 1022
D.
3.026 × 1022
Your answer is A
6.02 × 1023 particles
Answer: [tex]6.022\times 10^{23}[/tex]
Explanation: According to Avogadros law, one mole of any substance contains a fixed number of particles i.e [tex]6.022\times 10^{23}[/tex] particles (atoms, molecules or ions) which is also known by the name Avogadro's number.
For example: 1 mole of [tex]O_2[/tex] molecule contains [tex]6.022\times 10^{23}[/tex] molecules of oxygen.
1 mole of [tex]He[/tex] contains [tex]6.022\times 10^{23}[/tex] atoms of helium.
Which of the following pairs of elements is most likely to form an ionic bond?
A.
carbon and chlorine
B.
phosphorous and bromine
C.
sulfur and oxygen
D.
sodium and sulfur
Answer is: D. sodium and sulfur.
When the electronegativity difference is greater, the bond polarity is increasing..
Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.
Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.
Δχ(Na-S) = 2.6 - 0.95 = 1.655; electronegativity difference between sodium and sulfur.
Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).
Sodium is metal (forms cation) and sulfur is nonmetal (forms anion).
How many atoms are in one mole of gold? A) 1.97 x 1023 atoms. B) 6.02 x 1023 atoms C) 79 atoms. D) 197 atoms
B. Is the Answer 6.022 * 1023
Answer: B) [tex]6.022\times10^{23}[/tex] atoms.
Explanation:
According to the International System of units ,
A mole is basically denotes a unit that contains [tex]6.022\times10^{23}[/tex] of atoms.
It is also known as Avagadro Number.
Similarly, the number of atoms in one mole of gold = [tex]6.022\times10^{23}[/tex]
hence, the correct answer is B) [tex]6.022\times10^{23}[/tex] atoms.