Answer:
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
Explanation:
explanation is up there ^^
During a chemical reaction, the reactant molecules' chemical bonds are energetically influenced, resulting in the breaking and subsequent rearrangement to form product molecules with new chemical bonds. The best example of this is the reaction of hydrogen and oxygen to produce water, where the initial molecules' bonds are broken and rearranged to form water molecules.
Explanation:The details of what actually takes place during a chemical reaction are a little complex, but fundamentally, it involves the breaking and forming of chemical bonds. During a chemical reaction, the molecules of the reactants are influenced energetically so their chemical bonds are broken and they subsequently rearrange to form product molecules with new chemical bonds. Let's take a simple example: the reaction between hydrogen and oxygen to yield water:
H₂ + O₂ → H₂O
In this reaction, the chemical bonds within the hydrogen and oxygen molecules are broken and new ones are formed to create a water molecule. This process results in the release of energy.
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Caproic acid, which is responsible for the foul odor of dirty socks, is composed of Carbon, Hydrogen, and Oxygen atoms. A sample taken from a pair of abandon socks found in the locker room after a football game yielded 0.0930g of Carbon, 0.0156g of Hydrogen, and 0.0413g of Oxygen. Eww. They must have been worn more than once before being washed. Find the EMPIRICAL formula of caproic acid.
The empirical formula of caproic acid is C3H6O.
Explanation:The empirical formula of caproic acid can be determined by calculating the molar ratios of carbon, hydrogen, and oxygen in the compound. The masses of each element in the sample can be used to calculate the number of moles. From the molar ratios, we can determine the simplest whole number ratio of elements, which gives us the empirical formula.
Given that the sample contains 0.0930g of Carbon, 0.0156g of Hydrogen, and 0.0413g of Oxygen, we can calculate the number of moles:
Carbon: 0.0930g / 12.01 g/mol = 0.007749molesHydrogen: 0.0156g / 1.008 g/mol = 0.01547molesOxygen: 0.0413g / 16.00 g/mol = 0.002583molesNext, we divide the number of moles for each element by the smallest number of moles to get the simplest whole number ratio. In this case, the smallest number of moles is 0.002583moles:
Carbon: 0.007749moles / 0.002583moles = 3Hydrogen: 0.01547moles / 0.002583moles = 6Oxygen: 0.002583moles / 0.002583moles = 1Therefore, the empirical formula of caproic acid is C3H6O.
Final answer:
After converting the given masses of C, H, and O to moles and finding their mole ratio, we determine that the empirical formula for caproic acid is C3H6O.
Explanation:
To determine the empirical formula of caproic acid from the given masses of Carbon (C), Hydrogen (H), and Oxygen (O), we must first convert the masses to moles:
Carbon: 0.0930 g C × (1 mol C / 12.01 g C) = 0.007744 mol C
Hydrogen: 0.0156 g H × (1 mol H / 1.008 g H) = 0.015476 mol H
Oxygen: 0.0413 g O × (1 mol O / 16.00 g O) = 0.002581 mol O
Next, we find the ratio of moles of each element by dividing each by the smallest number of moles.
C: 0.007744 mol / 0.002581 mol = 3
H: 0.015476 mol / 0.002581 mol = 6
O: 0.002581 mol / 0.002581 mol = 1
Thus, the mole ratio of Carbon, Hydrogen, and Oxygen in caproic acid is 3:6:1, which simplifies to 1:2:1/3. However, we cannot have a fraction in an empirical formula, so we multiply by 3 to get whole numbers.
The empirical formula is therefore represented as C3H6O with the assumption that the molecule has the smallest number integers for carbon, hydrogen, and oxygen that maintain the ratio.
Look at the four positions of Earth with respect to the sun. Florida is in the Northern hemisphere. At what position of Earth will Florida experience the first day of spring? (2 points) Question 41 options: 1) Position 1 2) Position 2 3) Position 3 4) Position 4
Florida experiences the first day of spring when Earth is in Position 3 with respect to the Sun. On or about March 21, known as the vernal equinox, neither hemisphere is favored, and the Sun crosses the celestial equator, marking the first day of spring.
Explanation:Florida, which is located in the Northern Hemisphere, experiences the first day of spring when Earth is in Position 3 with respect to the Sun. On or about March 21, known as the vernal equinox, the Sun is on the celestial equator. This means that every place on Earth receives roughly 12 hours of sunshine and 12 hours of night. During this time, neither hemisphere is favored, and the Sun crosses the celestial equator, marking the first day of spring.
Part A
CHACHACHCH,CO K+
CH,CH
Spell out the full name of the compound.
Answer:
potassium 3-ethylpentanoate
or
potassium 3-ethylpentanoic acid
Explanation:
This is an organic compound.
This is a salt of carboxylic acid
This compound have 5 carbon main chain
There is an ethyl group is attached on carbon 3
K (Potassium) substituted the H (hydrogen) of pentanoic acid and form salt of it.
This compound shown in ionic form as salt solution written in ionic form.
So,
the name will be
Potassium 3-ethylpentanoate
it is also named as potassium 3-ethylpentanoic acid
Note: you can write any one of them both are right
the structure and name is given in attachment
Whatlis the maximum number of electrons the n =
4 shell can contain
Answer:
32
Explanation:
The maximum number of electrons can be calculated by using the expression 2n2
when n = 4
substitute n for 4
2(4)2
2(16) = 32
Answer:
32
Explanation:
Consider the following intermediate reactions.
CH4(g)+2O2->CO2(g)+2H2O(g) ΔH1=-802 kJ
2H2O(g)->2H2O(I) ΔH2=-88 kJ
The overall chemical reaction is as follows.
CH4(g)+2O2(g)->CO2(g)+2H2O(I) ΔH2=-890 kJ
What is the correct enthalpy diagram using the Hess law for this system?
Answer:
The answer is A on edge
Explanation:
If solid NaCl is added to a saturated water solution of PbCl2 at 20o C, a precipitate is formed. How would this affect the value of the Ksp for [Pb2+][Cl-] in solution? The Ksp increases. The Ksp decreases. The Ksp remains the same. none of the above.
Answer:
The [tex]K_{sp}[/tex] remains the same
Explanation:
Let's look at what actually happens in this scenario. Before we dive into the explanation, remember the principle of Le Chatelier: for a system at equilibrium, a specific disturbance in molarity/volume/pressure of any species in equilibrium would cause the equilibrium to shift towards the side that minimizes such a disturbance.
To begin with, we have a saturated water solution of lead(II) chloride. A saturated solution means that at the given temperature we have a maximum amount of lead(II) chloride that could dissolve in the given volume of water.
Since lead(II) chloride is not highly soluble, we have an equilibrium between the precipitate and the dissociated ions:
[tex]PbCl_2(s)[/tex]⇄[tex]Pb^{2+}(aq)+2Cl^-(aq)[/tex]
Now we're adding NaCl to this solution. Sodium chloride is a sparingly soluble salt which readily dissociates into sodium and chloride ions:
[tex]NaCl(aq)\rightarrow Na^+ (aq)+Cl^- (aq)[/tex]
Notice that sodium chloride increases the concentration of chloride ions in the solution, so the equilibrium between the precipitate and its ions is disturbed.
According to the principle of Le Chatelier, due to an increase in chloride ions, the equilibrium would be disturbed and the system would tend to decrease it in order to restore the equilibrium. Hence, the equilibrium shifts towards the precipitate forming more of the precipitate and decreasing the amount of lead(II) cation, as well as the excess of chloride ions. This is also called the common ion effect: the common ion decreases the solubility of a salt.
However, it only decreases the solubility of the salt but not the solubility product constant defined as:
[tex]K_{sp}=[Pb^{2+}][Cl^-]^2[/tex]
A decrease in lead(II) concentration is compensated by the excess of chloride. The solubility product is only temperature-dependent, just as any other equilibrium constant, so it doesn't depend on the molarity of chloride or lead(II) ions.
Solubility, on the other hand, is equal to:
[tex]S=[Pb^{2+}]=\frac{K_{sp}}{[Cl^-]^2}[/tex]
And, as you can see, it decreases, as K is kept constant and we have an increase in chloride.
Answer:
The answer is the Ksp remains the same.
Explanation:
I got this answer right on an assignment.
1. What types of evidence might be found at a bomb scene that could help
investigators catch the bomber? Choose one of the types of evidence that
you've identified and discuss how forensic scientists might find this type of
evidence at the scene and what information it might give them.
Answer:
Substances used to make the bomb
The area it was placed
Which people were in that area
How the bomb was set off
Explanation:
Examining the residues left at the scene by the bomb could tell forensics what the bomb was made out of, and the police could investigate possible leads about people who purchased (or have access to) such materials.
The area should give clues because security cameras could be used to trace who was there that should not be. There would be a possible suspect.
If it is a public place, then we can see if there is anyone of importance (to the suspect) that was there at that time.
If a remote detonator was used to set off the bomb, then the suspect would have to be relatively close to the bomb.
Answer:
Substances used to make the bomb
The area it was placed
Which people were in that area
How the bomb was set off
47. Describe the shapes and relative energies of the s, p, d, and f atomic orbitals.
Answer:
S orbital:spherical
P orbital:dumbbell
D orbital:double dumbbell
F orbital:complex
Explanation:
How does one recognize a periodic trend on the periodic table?
Answer:
Look for predictable changes and patterns - Apex
Answer:
Look for predictable changes and patterns
Explanation:
Ap3x
If you guys don’t mind can you explain to me why u think it’s either A, b, c, d plz and thank you
Answer: answer is D
Explanation:
Why is it not possible to just consume only pure ATP and thus eliminate some steps in
metabolism?
Our digestive has the steps of digestion and absorption associated with it. So all the compounds taken in as food are first broken down into simpler components before absorption.
Explanation:ATP or Adenosine Triphosphate is a compound containing a molecule of adenine as nitrogen base, a ribose sugar and three molecules of phosphate attached with the adenine in a chain. Its unable to get absorbed into the system as ATP itself. In intestine, it will be broken down into Adenine, ribose, and phosphates and then absorbed individually into blood.
Thus even if we consume raw ATP, we can't bypass the process of ATP formation. So, there's no significance. And secondly, ATP is very expensive and not suitable for consumption itself.
Describe the electron distribution in a polar-covalent bond and it's effect on the partial charges of the compound?
Answer:
In polar Covalent bonds, the electrons which are in bonded shifts towards an atom which has more valance electrons.
Explanation:
We know if an atom takes the electron it acquires a negative charge whereas if it gives an electron it acquires a positive charge in the ionic bond. But here we are talking about covalent bonds. Covalent bonds are those in which atoms share the electron instead of completely giving off the electron. If the atoms are identical in case of covalent bond that is 2 hydrogen atoms then this type of bonding is called pure covalent bonds but if the atoms linked in covalent bonds are different then it is called polar covalent bonds.
In this, the bonding electrons will shift towards an atom which has more valence electron thereby acquiring the partial negative charges and the other atom will acquire a partial positive charge. For example, HCl. In this the Chlorine atom is having more valence electron than hydrogen atom, and hence Chlorine atom has a partial negative charge and Hydrogen atom has a partial positive charge.
In polar Covalent bonds, the electrons that are in bonded shifts towards an atom that has more valance electrons.
The following information should be considered:
We know that the atom takes the electron it acquires a negative charge while on the other hand if it gives an electron it acquires a positive charge in the ionic bond. But Covalent bonds are those in which atoms share the electron instead of completely giving off the electron. In the case when the atoms are same in case of covalent bond that is 2 hydrogen atoms so this type of bonding is called pure covalent bonds. But if the atoms linked in covalent bonds are distinct so it is called polar covalent bonds. In this, the bonding electrons will shift towards an atom which has more valence electron thereby acquiring the partial negative charges and the other atom will acquire a partial positive charge.Learn more: https://brainly.com/question/13013054?referrer=searchResults
In comparing two reactions, the reaction with the greater activation energy always has (A) the slower rate. (B) the faster rate. (C) the rate that varies less with temperature. (D) the rate that varies more with temperature.
Answer: D the rate that varies more with temperature
Explanation: reaction with greater activation energy is not feasible ordinarily as the reacting molecules have little or no energy to overcome the activation energy. But as the temperature of the reaction is increased, the reacting molecules gains more energy to overcome the energy barriers(activation energy) hence proceeding to form products. In this case, the rate of the reaction depends on the temperature. So an increase in temperature will increase the kinetic energy of the molecules thereby increasing the rate of the reaction and a decrease in temperature will leads to a decrease in the rate of the reaction.
Final answer:
In comparing two chemical reactions, the reaction with the greater activation energy typically has the slower rate. This is due to fewer molecules being able to overcome the higher energy barrier to react. The correct answer to the question is (A) the slower rate.
Explanation:
In comparing two reactions, if one has a greater activation energy, it generally has the slower rate. Activation energy is the energy required to initiate a reaction, and it plays a critical role in determining the rate of a chemical reaction. A higher activation energy means that fewer molecules possess the necessary energy to overcome the barrier and react at a given temperature. Thus, the reaction with a higher Ea will have a slower rate.
Therefore, the correct answer to the question is: (A) the slower rate. As temperature increases, reactions with high activation energies can speed up considerably, because the proportion of molecules with sufficient energy to overcome the Ea increases significantly. Conversely, reactions with lower activation energies are less sensitive to temperature changes since a high proportion of molecules already have enough energy, even at lower temperatures.
NaOH (aq) + H2SO4 (aq) > H2O + NaSO4 (aq)
Answer:
[tex]2 NaOH (aq) + H_2SO_4 (aq)\rightarrow 2 H_2O (l) + Na_2SO_4 (aq)[/tex]
Explanation:
Let's correct and balance the given equation:
[tex]NaOH (aq)[/tex] is sodium hydroxide, charge of sodium is +1, charge of hydroxide is -1, so it's fine;[tex]H_2SO_4 (aq)[/tex] is sulfuric acid, charge of hydrogen cation is +1, charge of sulfate is -2, sulfate is balanced by the two protons;[tex]H_2O (l)[/tex] is firstly a molecule, it's water, in its liquid state, the oxidation state of +1 for the two hydrogens is balanced by the oxidation state of -2 for oxygen;sodium sulfate should be [tex]Na_2SO_4 (aq)[/tex], since sulfate has a charge of -2, this would require two sodium cations to balance it.The equation becomes:
[tex]NaOH (aq) + H_2SO_4 (aq)\rightarrow H_2O (l) + Na_2SO_4 (aq)[/tex]
We require 2 NaOH in order to balance the two sodium cations on the right, this would yield a total of 4 hyrogens on the left, so we also need two water molecules to balance it fully:
[tex]2 NaOH (aq) + H_2SO_4 (aq)\rightarrow 2 H_2O (l) + Na_2SO_4 (aq)[/tex]
“While electroplating is most commonly viewed as a finishing process for metals, it can be used with great success on non-conductive material as well”. Justify this statement with suitable examples.
Answer:
ls most commonly viewed as a metals
50cm3 of 1 mol/dm3 HCl at 30°C was mixed with 50cm3 of 1mol/dm3 NaOH at 30°C in a styrofoam calorimeter. The temperature of the calorimeter rose by 4.5°C. Calculate the heat of reaction per mol of H20 formed.( heat capacity of the calorimeter is 50J/°C
Answer:
-21 kJ·mol⁻¹
Explanation:
Data:
H₃O⁺ + OH⁻ ⟶ 2H₂O
V/mL: 50 50
c/mol·dm⁻³: 1.0 1.0
ΔT = 4.5 °C
C = 4.184 J·°C⁻¹g⁻¹
C_cal = 50 J·°C⁻¹
Calculations:
(a) Moles of acid
[tex]\text{Moles of acid} = \text{0.050 dm}^{3} \times \dfrac{\text{1.0 mol}}{\text{1 dm}^{3}} = \text{0.050 mol}\\\\\text{Moles of base} = \text{0.050 dm}^{3} \times \dfrac{\text{1.0 mol}}{\text{1 dm}^{3}} = \text{0.050 mol}[/tex]
So, we have 0.050 mol of reaction
(b) Volume of solution
V = 50 dm³ + 50 dm³ = 100 dm³
(c) Mass of solution
[tex]\text{Mass of solution} = \text{100 dm}^{3} \times \dfrac{\text{1.00 g}}{\text{1 dm}^{3}} = \text{100 g}[/tex]
(d) Calorimetry
There are three energy flows in this reaction.
q₁ = heat from reaction
q₂ = heat to warm the water
q₃ = heat to warm the calorimeter
q₁ + q₂ + q₃ = 0
nΔH + mCΔT + C_calΔT = 0
0.050ΔH + 100×4.184×4.5 + 50×4.5 = 0
0.050ΔH + 1883 + 225 = 0
0.050ΔH + 2108 = 0
0.050ΔH = -2108
ΔH = -2108/0.0500
= -42 000 J/mol
= -42 kJ/mol
This is the heat of reaction for the formation of 2 mol of water
The heat of reaction for the formation of mol of water is -21 kJ·mol⁻¹.
Describe all of the van der Waals forces that exist between molecules of water.
Explanation:
The van der Waals' forces are the forces that exist between the millions of separate water molecules, and not between the hydrogen and oxygen atoms in the case of water. Dipole-Dipole forces are one of van der Waals' three forces. ... For example, HCl comprised of the atom Hydrogen and Chlorine is polar.
The mass of a neutron is 1.67 x 10^-24 g. Approximately what number of neutrons would equal a mass of one gram?
The number of neutrons that would equal a mass of one gram is approximately 6 x 10^23, which is also known as Avogadro's number.
Explanation:To find the number of neutrons that would equal a mass of one gram, you would need to divide the desired mass (1 gram) by the mass of a single neutron, which is 1.67 x 10^-24 g. So, the calculation would be 1 g / 1.67 x 10^-24 g = approximately 6 x 10^23 neutrons. This number is also known as Avogadro's number, a familiar concept in chemistry and physics.
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Q10.An aqueous solution contains 5.00x10-2 mol/L of Ca2+ and 7.00x10-3 mol/L of SO4
2-
. Show whether
this solution would precipitate anhydrite CaSO4 or not provided that the Ksp for anhydrite is equal to 10-4.5.
Answer:
The precipitate will form.
Explanation:
Let's write the equilibrium expression for the solubility product of calcium sulfate:
[tex]CaSO_4(s)[/tex] ⇄ [tex]Ca^{2+}(aq)+SO_4^{2-}(aq)[/tex]
The solubility product is defined as the product of the free ions raised to the power of their coefficients, in this case:
[tex]K_{sp}=[Ca^{2+}][SO_4^{2-}]=10^{-4.5}[/tex]
Our idea is to find the solubility quotient, Q, and compare it to the K value. A precipitate will only form if Q > K. If Q < K, the precipitate won't form. In this case:
[tex]Q_{sp}=[Ca^{2+}][SO_4^{2-}]=5.00\cdot10^{-2} M\cdot7.00\cdot10^{-3} M=3.5\cdot10^{-4}[/tex]
Now given the K value of:
[tex]K_{sp}=10^{-4.5}=3.2\cdot10^{-5}[/tex]
Notice that:
[tex]Q_{sp}>K_{sp}[/tex]
This means the precipitate will form, as we have an excess of free ions and the equilibrium will shift towards the formation of a precipitate to decrease the amount of free ions.
it takes 60 days for 1024 grams of element XY to decay to 32 grams. what is the half life of element XY
Answer:
The half life of element XY is 12 days
Explanation:
Given:
Time taken for 1024 grams to decay into 32 grams = 60 days
To Find:
The half life of element XY = ?
Solution:
The Half life is calculated by
[tex]N = N_0 (\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}[/tex]
[tex]t_{\frac{1}{2}}[/tex] =[tex]\frac{t}{log_{\frac{1}{2}}( \frac{N(t)}{N_0})}}[/tex]
Substituting the values,
[tex]t_{\frac{1}{2}}[/tex] =[tex]\frac{60}{log_{\frac{1}{2}}( \frac{32}{1024})}}[/tex]
[tex]t_{\frac{1}{2}}[/tex] =[tex]\frac{60}{log_{\frac{1}{2}}(0.03125)}}[/tex]
[tex]t_{\frac{1}{2}}[/tex] =[tex]\frac{60}{5}[/tex]
[tex]t_{\frac{1}{2}}[/tex] = 12
What is the mathematical formula expressing Newton's Second Law of Motion?
p=mv
F=ma
A=v2-v1/t
Speed=distance/time
Answer:
The mathematical formula expressing Newton's Second Law of Motion is :
F = ma
Explanation:
Second Law of Motion : It states that external unbalanced force is directly proportional to rate of change of momentum.
Its formula becomes : F = ma
[tex]F = \frac{m(v-u)}{t}[/tex]
Put,
[tex]\frac{(v-u)}{t} = a[/tex]
F = ma
Answer:
F = ma
Explanation:
Which of the following pairs of elements is most likely to form a covalent bond? A. Sodium and chlorine B. Magnesium and Oxygen C. Phosphorus and Bromine D. Copper and Oxygen
The pair of elements Phosphorus and Bromine is most likely to form a covalent bond. Covalent bonds typically occur between nonmetals, as they share electrons to reach stability. Other given pairs, involving metals and nonmetals, are more likely to form ionic bonds.
Explanation:Among the pairs of elements provided, the pair that is most likely to form a covalent bond is Phosphorus and Bromine. A covalent bond typically forms when two nonmetals, like phosphorus and bromine, share electrons. In contrast, sodium and magnesium are metals which usually form ionic bonds when they combine with nonmetals (like chlorine for sodium and oxygen for magnesium). Copper can also form ionic bonds with nonmetals like oxygen.
As an example, consider a molecule like oxygen gas (O=O). Each oxygen atom has six electrons in its valence shell and needs two more to reach stability. This stability is achieved when the two oxygen atoms share two pairs of electrons, forming a double covalent bond.
In contrast, consider the formation of sodium chloride (table salt). Sodium readily donates its single valence electron to chlorine, which needs only one more electron to be stable. This results in the formation of a sodium cation and a chloride anion, which are held together by an ionic bond.
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calculate "de Broglie" wavelength for each of the following, and use your numerical answers the to explain why macroscopic (large) objects are not ordinarily discussed in terms of their "wave-like" properties. a. an electron moving at .90 times the speed of light.
b. a 150-g ball moving at a speed of 10.m/s
Answer:
a. [tex]2.69 pm[/tex]
b. [tex]4.42\cdot 10^{-34} m[/tex]
Explanation:
The de Broglie wavelength can be found by the following equation:
[tex]\lambda_{dB} = \frac{h}{mv}[/tex]
Here:
[tex]\lambda_{dB}[/tex] is the de Broglie wavelength (in m);
[tex]h[/tex] is the Planck's constant, [tex]h = 6.626\cdot 10^{-34} J\cdot s[/tex];
[tex]m[/tex] is mass (in kg);
[tex]v[tex] is velocity (in m/s).
a. We need to know the mass of an electron here:
[tex]m_e=9.11\cdot10^{-31} kg[/tex]
And the speed of light:
[tex]c = 3.00\cdot 10^8 m/s[/tex]
The fraction of the speed of light is:
[tex]\omega = 0.90[/tex]
Substituting into the equation:
[tex]\lambda_{dB} = \frac{h}{\omega c m_e}=\frac{6.626\cdot10^{-34} J\cdot s}{0.90\cdot 9.11\cdot 10^{-31} kg\cdot 3.00\cdot 10^8 m/s} = 2.69\cdot 10^{-12} m = 2.69 pm[/tex]
b. Similarly, here we have:
[tex]m_b=150 g = 0.150 kg[/tex]
And the velocity of:
[tex]v = 10 m/s[/tex]
We obtain:
[tex]\lambda_{dB}={6.626\cdot 10^{-34} J\cdot s}{0.150 kg\cdot 10 m/s} = 4.42\cdot 10^{-34} m[/tex]
Notice that the wavelength of a large object is smaller by a fraction of:
[tex]\frac{2.69\cdot 10^{-12} m}{4.42\cdot 10^{-34} m} = 6\cdot 10^{21}[/tex]
This means the de Broglie wavelength of a macroscopic object is negligible compared to the wavelength of a microscopic object.
balancing the reaction by oxidation number method k2cr2o7+sncl2+hcl
Answer:
[tex]K_2Cr_2O_7 (aq) + 14 HCl (aq) + 3 SnCl_2 (aq)\rightarrow 2 CrCl_3 (aq) + 7 H_2O (l) + 3 SnCl_4 (aq) + 2 KCl (aq)[/tex]
Explanation:
The products of this reaction are given by:
[tex]K_2Cr_2O_7 (aq) + SnCl_2 (aq) + HCl (aq)\rightarrow KCl (aq) + SnCl_4 (aq) + CrCl_3 (aq) + H_2O (l)[/tex]
Firstly, dichromate anion becomes chromium(III) cation, let's write this change:
[tex]Cr_2O_7^{2-} (aq)\rightarrow Cr^{3+} (aq)[/tex]
The following steps should be taken:
balance the main element, chromium: multiply the right side by 2 to get 2 chromium species on both side:[tex]Cr_2O_7^{2-} (aq)\rightarrow 2 Cr^{3+} (aq)[/tex]
balance oxygen atoms by adding 7 water molecules on the right:[tex]Cr_2O_7^{2-} (aq)\rightarrow 2 Cr^{3+} (aq) + 7 H_2O (l)[/tex]
balance the hydrogen atoms by adding 14 protons on the left:[tex]Cr_2O_7^{2-} (aq) + 14 H^+ (aq)\rightarrow 2 Cr^{3+} (aq) + 7 H_2O (l)[/tex]
balance the charge (the total net charge on the left is 12+, on the right we have 6+, so 6 electrons are needed on the left):[tex]Cr_2O_7^{2-} (aq) + 14 H^+ (aq) + 6e^-\rightarrow 2 Cr^{3+} (aq) + 7 H_2O (l)[/tex]
Similarly, tin(II) cation becomes tin(IV) cation:
[tex]Sn^{2+} (aq)\rightarrow Sn^{4+} (aq) + 2e^-[/tex]
Now that we have the two half-equations, multiply the second one by 3, so that it also has 6 electrons that will be cancelled out upon addition of the two half-equations:
[tex]Cr_2O_7^{2-} (aq) + 14 H^+ (aq) + 6e^-\rightarrow 2 Cr^{3+} (aq) + 7 H_2O (l)[/tex]
[tex]3 Sn^{2+} (aq)\rightarrow 3 Sn^{4+} (aq) + 6e^-[/tex]
Add them together:
[tex]Cr_2O_7^{2-} (aq) + 14 H^+ (aq) + 3 Sn^{2+} (aq)\rightarrow 2 Cr^{3+} (aq) + 7 H_2O (l) + 3 Sn^{4+} (aq)[/tex]
Adding the ions spectators:
[tex]K_2Cr_2O_7 (aq) + 14 HCl (aq) + 3 SnCl_2 (aq)\rightarrow 2 CrCl_3 (aq) + 7 H_2O (l) + 3 SnCl_4 (aq) + 2 KCl (aq)[/tex]
Two people must have the same speed and velocity if
Answer:
They are jogging side by side at 5 m/s
Let's distinguish between the concepts of speed and velocity:
speed is a scalar quantity: a scalar quantity has a magnitude but not a direction, it's simply a number which doesn't indicate the direction of movement;velocity is a vector: a vector indicates both a magnitude (it has a scalar quantity) and a direction.The first condition we have here is the fact that two people have the same speed, this means they are moving at the same rate of change of distance. The second condition must be met as well, if we wish them to have the same velocity, this means they should be moving in the same direction, let's say, along the positive or negative x-axis, but not in opposite directions.
H2CO3(aq) + H200 H30 (aq) + HCO3 (aq).
What is the correct equilibrium expression?
© B.
0 C.
Ô D.
"Ka" = (["H"_3"O"A+]["HCO" 3^(-2)/(["H"_2"CO"_3])
"Ka" = (["H"_3"O"A+]["H"_2"CO"_3])/(["HEO"_3^(-1)
"Ka" = (T"H"_2"CO"_3]["H"_2"O"] ["H"_3"O"A+]["HCO"_3^(-)
"Ka" = (["H"_3"O"A+]["HCO"_3^(-1)/(["H"_2"CO"_3]["H"_2"O"]
Answer:
[tex]K_a=\frac{[H_3O^+][HCO_3^-]}{[H_2CO_3]}[/tex]
Explanation:
Several rules should be followed to write any equilibrium expression properly. In the context of this problem, we're dealing with an aqueous equilibrium:
an equilibrium constant is, first of all, a fraction;in the numerator of the fraction, we have a product of the concentrations of our products (right-hand side of the equation);in the denominator of the fraction, we have a product of the concentrations of our reactants (left-hand side o the equation);each concentration should be raised to the power of the coefficient in the balanced chemical equation;only aqueous species and gases are included in the equilibrium constant, solids and liquids are omitted.Following the guidelines, we will omit liquid water and we will include all the other species in the constant. Each coefficient in the balanced equation is '1', so no powers required. Multiply the concentrations of the two products and divide by the concentration of carbonic acid:
[tex]K_a=\frac{[H_3O^+][HCO_3^-]}{[H_2CO_3]}[/tex]
Take a shiny soup spoon and look at your reflection in the side that holds the soup. What does it look like? Can you explain this, using the terms "angle of incidence" and "angle of reflection"? Now turn the spoon over and look at your reflection in the back of it. What does it look like now?
Answer:
When observing the image inside a spoon, the image seems to be bent or cut, because the rays of light deviate with a certain angle of incidence, since they travel slower when passing from the air, where there are less particles, to the liquid, where there are more particles .
When turning the spoon a specular reflection is observed, it is when the surfaces are polished, the light rays are reflected with and angle of reflection in only one direction and in an orderly manner. This is why images are formed that look like copies of objects.
Explanation:
Reflection and refraction of waves are two phenomena that occur when a wave that propagates in a certain medium meets a separation surface with another medium.
Reflection is the change in direction that a wave experiences when it comes into contact with the surface that separates two media while returning to the point where it originated. Refraction is the change of direction and speed that a wave undergoes obliquely on a surface that separates two media with different refractive indices.
Reflection occurs when light hits a surface and part of it changes direction and returns in the same direction to the point from which it left. This phenomenon also occurs with sound waves. Refraction occurs when the invisible light passes through a transparent material, changes direction and passes obliquely between two media with different refractive index. In reflection light travels in the same medium. In refraction, light travels from one medium to another.
Looking at your reflection in a shiny soup spoon is a result of light reflection. The angle of incidence and angle of reflection are equal, resulting in an upright and undistorted image. The back of the spoon is concave, causing an upside down and distorted reflection.
Explanation:
When you look at your reflection in the side of a shiny soup spoon, you will see an upright and undistorted image. This is because of the reflection of light. The angle at which light hits the spoon, known as the angle of incidence, is equal to the angle at which it reflects off the spoon, known as the angle of reflection. The back of the spoon is concave, so when you look at your reflection in it, the image will be upside down and distorted.
Learn more about Light reflection here:https://brainly.com/question/35434029
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A plastic wading pool has a circumference of 12.56 feet. Which procedure will help you
find the diameter of the pool?
The diameter of the pool is 4
Explanation:
To calculate the diameter we must write the values given in the question, here
The circumference of the pool is given as C=12.56 feet.
To calculate the diameter of the pool,
If radius is given, Multiply the radius by 2
If Circumference is given divide the circumference by Pi (π)
the constant value for Pi (π)=3.14
Diameter(D)= C/π
12.56/3.14
=4
The diameter for the plastic wading pool is 4
1. If you have a 1-g sample of Po-218, how many grams would you
have after 6 minutes? After 18 minutes?
Answer:
a) 0.25 g b) 0.01542 g
Explanation:
Half life of Po-218 = 3.04 minutes
initial mass = 1 g
after 3.04 minutes it will remain 0.5 g
after another 3.04 minutes it will remain 0.25 g
After 6 minutes it will remain approx 0.25 g
B) after another 3.04 minutes it will remain 0.125 g
after another 3.04 minutes it will remain 0.0625 g
after another 3.04 minutes it will remain 0.03125 g
after another 3.04 minutes it will remain 0.015625 g
After 18 minutes it will remain approx 0.01542 g
which question would most likely be studied by a physicist
Answer:
how does gravity affect something
Explanation:
they study physics.
hope this helped