Answer:
[tex]\boxed{\text{(a) 209 mL; (b) } 6.09 \times 10^{23}}[/tex]
Explanation:
(a) Gas produced at cathode.
(i). Identity
The only species known to be present are Cu, H⁺, and H₂O.
Only the H⁺ and H₂O can be reduced.
The corresponding reduction half reactions are:
(1) 2H₂O + 2e⁻ ⇌ H₂ + 2OH⁻; E° = -0.8277 V
(2) 2H⁺ +2e⁻ ⇌ H₂; E° = 0.0000 V
Two important points to remember when using a table of standard reduction potentials:
The higher up a species is on the right-hand side, the more readily it will lose electrons (be oxidized). The lower down a species is on the left-hand side, the more readily it will accept electrons (be reduced}.H⁺ is below H₂O, so H⁺ is reduced to H₂.
The cathode reaction is 2H⁺ +2e⁻ ⇌ H₂, and the gas produced at the cathode is hydrogen.
(ii) Volume
a. Anode reaction
The only species that can be oxidized are Cu and H₂O.
The corresponding half reactions are:
(3) Cu²⁺ + 2e⁻ ⇌ Cu; E° = 0.3419 V
(4) O₂ + 4H⁺ + 4e⁻ ⇌ 2H₂O E° = 1.229 V
Cu is above H₂O, so Cu is more easily oxidized.
The anode reaction is Cu ⇌ Cu²⁺ + 2e⁻.
b. Overall reaction:
Cu ⇌ Cu²⁺ + 2e⁻
2H⁺ +2e⁻ ⇌ H₂
Cu + 2H⁺ ⇌ Cu²⁺ + H₂
c. Moles of Cu lost
[tex]n_{\text{Cu}} = \text{0.584 g } \times \dfrac{\text{1 mol}}{\text{63.55 g}} = 9.190 \times 10^{-3}\text{ mol Cu}[/tex]
d. Moles of H₂ formed
[tex]n_{\text{H}_{2}}} = 9.190 \times 10^{-3}\text{ mol Cu} \times \dfrac{\text{1 mol H}_{2}}{\text{1 mol Cu}} =9.190 \times 10^{-3}\text{ mol H}_{2}[/tex]
e. Volume of H₂ formed
Volume of 1 mol at STP (0 °C and 1 bar) = 22.71 mL
[tex]V = 9.190 \times 10^{-3}\text{ mol}\times \dfrac{\text{22.71 L}}{\text{1 mol}} = \text{0.209 L} = \boxed{\textbf{209 mL}}[/tex]
(b) Avogadro's number
(i) Moles of electrons transferred
[tex]\text{Moles of electrons} = 9.190 \times 10^{-3}\text{ mol Cu}\times \dfrac{\text{2 mol electrons}}{\text{1 mol Cu}}\\\\\\= \text{0.018 38 mol electrons}[/tex]
(ii) Number of coulombs
Q = It
Q = \text{1.18 C/s} \times 1.52 \times 10^{3} \text{ s} = 1794 C
(iii). Number of electrons
[tex]n = \text{ 1794 C} \times \dfrac{\text{1 electron}}{1.6022 \times 10^{-19} \text{ C}} = 1.119 \times 10^{22} \text{ electrons}[/tex]
(iv) Avogadro's number
[tex]N_{\text{A}} = \dfrac{1.119 \times 10^{22} \text{ electrons}}{\text{0.018 38 mol}} = \boxed{6.09 \times 10^{23} \textbf{ electrons/mol}}[/tex]
Which statement correctly describes the phosphate ion, ? It is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. It is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. It is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. It is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.
Answer:
It is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion.
Explanation:
The formula of phosphate ion is PO₄³⁻
The formula shows a phosphorus atom surrounded by 4 oxygen atoms.
For this bond to be established, phosphorus would be covalenty bonded to the oxygen atoms.
A covalent bond arises when two atoms with similar zero or very small electronegativity difference(≤ 0.5 ) combines. The electronegativity difference between phosphorus and oxygen is less than 0.5 and the two atom would bond by sharing of their electrons.
The net charge on the resulting radical is a -3 charge which it uses to form other bond types with other atoms. The charge implies an excess of 3 electrons on the radical formed.
The correct statement describing the phosphate ion is: It is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion.
The phosphate ion is composed of phosphorus and oxygen atoms with a distributed charge, breaking the octet rule in chemistry. Phosphorus can break the 'octet rule' due to d orbitals availability, and the charge on phosphate ions is evenly spread over oxygen atoms.
Phosphate group: a molecular group consisting of a central phosphorus atom bound to four oxygen atoms.
You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount
Answer:
Before adding the spatula tip amount: saturated solution.
After adding the spatula tip amount: super saturated solution.
Explanation:
A saturated solution is when the solute can dissolve in the solvent. For example, if you have an amount of water and you put calcium chloride into the water, and it dissolves, the solution is saturated.A supersaturated solution is when you put the calcium chloride into the solvent and the solute doesn't dissolve.So,Before adding the spatula tip amount: the solution is saturated.
After adding the spatula tip amount: the solution is super saturated.
Explanation:
When small amount of solute is added to a solvent and if it readily dissolves then this type of solution is known as an unsaturated solution.
For example, in the given situation when calcium chloride is first dissolved in water then it completely dissolves and this makes the solution unsaturated.
And, a saturated solution is defined as a solution which contains maximum amount of solute.
So, when a spatula tip full of calcium chloride is added into water then it is unable to dissolve the solute. This means the solution has become saturated.
Thus, we can conclude that solution before adding the spatula tip amount is unsaturated and after adding the spatula tip amount the solution becomes saturated.
Balance the following reaction. 2Ca3(PO4)2 + C + 6SiO2 → CaSiO3 + P4 + CO
Answer:
2Ca₃(PO₄)₂ + 10C + 6SiO₂ → 6CaSiO₃ + P₄ + 10CO.
Explanation:
To balance a chemical reaction, we should apply the law of conservation of mass.Law of conversation of mass states that the no. of atoms is equal in both sides of the chemical reaction.So, the balanced chemical reaction is:2Ca₃(PO₄)₂ + 10C + 6SiO₂ → 6CaSiO₃ + P₄ + 10CO.
that 2 mol of Ca₃(PO₄)₂ react with 10 mol of C and 6 mol of SiO₂ to produce 6 mol of CaSiO₃, 1 mol of P₄ and 10 mol of CO.
Answer:
First one is (10) , second one is (6) , and third one is (10).
Explanation: 10 , 6 , 10 is the correct order!
What is the “Ring of Fire?”
Answer:
The Ring of Fire is also called the Circum-Pacific Belt and refers to a path along the Pacific Ocean which is characterized by frequent earthquakes and active volcanoes.
Explanation:
The Ring of Fire is also called the Circum-Pacific Belt and refers to a path along the Pacific Ocean which is characterized by frequent earthquakes and active volcanoes.
The majority of Earth’s earthquakes and volcanoes usually occur along the Ring of Fire.
What is the charge on oxygen (O) when it forms an ion?
1+
1−
2+
2−
Answer:
2- (last choice) when it forms an ion.
Which is/are true?
[mark all correct answers]
a. Li has valence electrons in the n = 1 energy level.
b. Si has valence electrons in the n = 3 energy level.
c. Ga has valence electrons in the n = 3 energy level.
d. Xe has valence electrons in the n = 5 energy level.
e. P has valence electrons in the n = 2 energy level.
Answer:
b. Si has valence electrons in the n= 3 energy level.
d. Xe has valence electrons in the n=5 energy level
Explanation:
A silicon atom has 14 electrons and 14 protons in its structure. Therefore it has a simple electron configuration of 2.8.4
It therefore has 3 energy levels. The outermost 4 electrons are the valence electrons.
A xenon has an electron configuration of 2.8.18.18.8 = 5 energy levels. The outermost 8 electrons are the valence electrons.
A reaction in which products can react to re-form reactants is
Saturated hydrocarbons have all of their carbon atoms bonded to four neighbors.
a. True
b. False
I'm thinking the answer is false but I'm not entirely sure.
Answer:
A
Explanation:
The carbon atoms in saturated hydrocarbons are linked with single covalent bonds to their neighbors. The chains of saturated hydrocarbon are therefore well compact with hydrogen bonds between one another. This is why most saturated hydrocarbons are solid at room temperature. Unsaturated hydrocarbons have kinks in their chains that interrupt hydrogen bonds between chains. These kinks are because some carbon atoms in the chains have double or tripple covalent bonds.
Complete these equations for the ionization of an Arrhenius acid or base in water. Include the states of the products.HI (aq) ----------------> __________?LiOH (s) -----------------> ________?
Sugars in a polysaccharide are linked together by bonds to _____.
a nitrogen atom
a carbon atom
an oxygen atom
a sulfur atom
Answer:
It's an oxygen atom
Explanation:
Where in the lungs does gas exchange occur
Answer: Between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.
Gas exchange in the lungs occurs in the alveoli. Oxygen diffuses from the alveoli into the blood, while carbon dioxide diffuses from the blood into the alveoli.
Gas exchange in the lungs, also referred to as pulmonary gas exchange, primarily occurs in the alveoli. The alveoli are tiny, grape-like clusters surrounded by networks of thin-walled pulmonary capillaries.
Here is a step-by-step explanation of the gas exchange process:
When you inhale, air enters the alveoli, which have a higher concentration of oxygen compared to the blood in the surrounding capillaries.Oxygen diffuses from the alveoli into the blood because of this concentration gradient.Conversely, the blood in the capillaries has a higher concentration of carbon dioxide than the alveoli, causing carbon dioxide to diffuse into the alveoli.This exchange of gases allows oxygenated blood to travel through the pulmonary veins to the rest of the body, while carbon dioxide is expelled when you exhale.The vast number of alveoli (around 300 million per lung) provides a large surface area, maximizing the efficiency of gas exchange.
Calculate the molarity of an aqueous solution that is 18.2% by mass calcium chloride. You might need to know that the density is 1.18 g/ml.
Answer:
M = 1.94 mol/liter = 1.94 MExplanation:
1) Data:
a) M = ?
b) % mass = 18.2%
c) Solute: CaCl₂
d) d = 1.18 g/ml
2) Formulae:
a) Molarity
M = n/V, where M is molarity, n is number of moles of solute, and V is the volumen of solution in liters.
b) Density
d = m/V, where d is the density of the solution, m is the mass in grams, V is the volume in liters.
c) Number of moles
n = mass in grams / molar mass, where n is the number of moles.
d) % mass
% = (mass of solute / mass of solution) × 100
3) Solution:
a) Start by assuming a base amount: 100 g of solution.
b) Calcualte the volume (V) of the solution:
d = m / V ⇒ V = m / dV = 100 g / 1.18 g/ml = 84.75 ml
V = 0.08475 liter
c) Calculate the mass of solute:
% = (mass of solute / mass of solution) × 100⇒ mass of solute = % × mass of solution / 100 = 18.2 × 100 g / 100
mass of soiute = 18.2 g
d) Calculate the number of moles of solute (n)
molar mass of CaCl₂ = 110.98 g/mol g/moln =mass in grams / molar mass = 18.2 g / 110.98 g/mol = 0.164 mole) Calculate the molarity (M) of the solution
M = n / V = 0.164 mol / 0.08475 liter = 1.94 mol/liter = 1.94 MThe answer is reported with 3 significant figures, since the data have 3 significant figures.
Answer:
The Molarity of the aqueous solution that is 18.2% by mass calcium chloride is 1.94 moles/liter.
Key points:
Molarity is the concentration of a solution in moles per liter. It is calculated by dividing the number of moles of a solution, n by its volume in liters, V. That is; Molarity = n/VWhen given the molarity of a solution and the volume of the solution then we can get the number of moles, by multiplying the molarity by volume; n = MV.Number of moles of a compound can also be given by dividing the mass of the compound by its relative molecular mass.The percentage by mass is given by;= (mass of solute/mass of the solution)×100%.
Density of a solution is give by dividing the mass of a solution by its volume. That is; density = mass/volume.Step by Step Explanation:
Step 1: Calculate the mass of the solute.
Percentage of solute by mass is 18.2%.
Assuming the mass of the solution to be 100g, then;
percentage by mass = (mass of solute/mass of the solution)×100%.
= 18.2 % = (x/100) × 100
= 0.182 = x/100
x = 18.2 g
Thus, mass of solute = 18.2 g
Step 2: Calculating the volume of the solution.
Density of the solution is 1.18 g/ml
But, density = mass/volume
Thus, Volume = mass/density
Mass of the solution is 100 g
Therefore;
Volume = 100 g/ 1.18 g/ml
= 84.75 mL or 0.08475 L
Step 3: Calculating the number of moles of the solute, Calcium chloride,
Number of moles = mass of solute/ molecular mass of solute
Mass of solute = 18.2 g
Molecular mass of Calcium chloride is 110.98 g/mol
Thus;
Number of moles = 18.2 g/110.98 g/mol
= 0.164 mole
Step 4: Calculating the molarity of the solution;
Molarity = number of moles/ volume in L
number of moles = 0.164 mole
Volume in L = 0.08475 L
Therefore;
Molarity = 0.164 mole/0.08475 L
= 1.94 moles/L or 1.94 M
What two factors speed up rates of chemical reaction and weathering in rocks and soils?
Answer:
Moist and warm temperatures
Explanation:
Temperature and rainfall are the two main factors that speed up chemical reactions and weathering in rocks and soils. Higher temperatures increase the rate of reactions while more rainfall means more water for chemical weathering, resulting in a higher weathering rate.
The two factors that speed up rates of chemical reaction and weathering in rocks and soils are the temperature and the amount of rainfall. A higher temperature increases the rate of chemical reactions, with the rate potentially doubling for every 10°C increase. This is because higher temperatures enhance the thermal agitation of atoms and molecules, leading to more frequent collisions and reactions. In addition, increased rainfall provides more water, an essential medium for chemical weathering reactions. More rainfall leads to more chemical reactions with the particles in soils, increasing the weathering rate.
Mechanical weathering also plays a role by breaking down rocks into smaller pieces, thus increasing the surface area available for chemical weathering. Together, mechanical and chemical weathering contribute to the deterioration of rocks and the formation of soil, which is crucial for ecosystems. The combination of climate factors, such as high temperature and heavy rainfall, typically results in nutrient-poor soils unsuitable for agriculture but rich in iron and aluminum oxides.
How many carbon atoms are found in 10.0g of c2h6?
Please explain.
Explanation:
Molar mass of C2H6= 2×12+6=30
30 g of C2H6 gives 1 mol of C2H6
10.0 g of C2H6 gives 1/30 ×10= 1/3 mol of C2H6
1 mol of C2H6 has 2 mol of Carbon
1/3 mol of C2H6 has 1/3 ×2 = 2/3 Molly of Carbon.
No. of atoms = 2/3× 6.023×10^23
=4.01×10^23
To determine the number of carbon atoms in 10.0 g of C2H6, calculate the number of moles from the mass and molar mass, and then multiply by Avogadro's number and the number of carbon atoms per molecule of ethane. This results in approximately 4.015 × 1023 carbon atoms.
Explanation:To find out how many carbon atoms are in 10.0g of C2H6, we first need to calculate the molar mass of ethane (C2H6). The molar mass is the sum of the masses of all the atoms in a molecule. Carbon has a molar mass of approximately 12 g/mol, and hydrogen has a molar mass of about 1 g/mol. Therefore, the molar mass of C2H6 is (2 × 12 g/mol) + (6 × 1 g/mol) = 30 g/mol.
Next, we calculate how many moles of C2H6 are in 10.0 g of the substance using the molar mass:
Number of moles of C2H6 = mass ÷ molar mass = 10.0 g ÷ 30 g/mol
This gives us approximately 0.333 moles of C2H6. Since each molecule of ethane contains 2 carbon atoms, we can find the total number of carbon atoms:
Total number of carbon atoms = number of moles of C2H6 × Avogadro's number × number of carbon atoms per molecule = 0.333 moles × 6.022 × 1023 atoms/mol × 2
Finally, this calculation will give us the total number of carbon atoms in 10.0 g of C2H6, which is approximately 4.015 × 1023 carbon atoms.
The equilibrium constant is given for one of the reactions below. Determine the value of the missing equilibrium constant.
H2(g) + Br2(g) ⇌ 2 HBr(g) Kc = 3.8 × 104
4 HBr(g) ⇌ 2 H2(g) + 2 Br2(g) Kc = ?
The value of the missing equilibrium constant is [tex]6.9\times 10^{-10}[/tex].
Given:
The equilibrium constant of the reaction:
[tex]H_2(g) + Br_2(g) \rightleftharpoons 2 HBr(g) ,K_c = 3.8\times 10^4[/tex]...(i)
The other reaction:
[tex]4HBr(g)\rightleftharpoons 2H_2(g) + 2Br_2(g)[/tex]....(ii)
To find:
The equilibrium constant of the other reaction:
[tex]4HBr(g)\rightleftharpoons 2H_2(g) + 2Br_2(g)[/tex]
Solution:
[tex]H_2(g) + Br_2(g) \rightleftharpoons 2 HBr(g) ,K_c = 3.8\times 10^4...(i)[/tex]
The expression of the equilibrium constant of the reaction (i):
[tex]K_c=\frac{[HBr]^2}{[H_2][Br_2]}...[1]\\\\3.8\times 10^4=\frac{[HBr]^2}{[H_2][Br_2]}[/tex]
The other chemical reaction :
[tex]4HBr(g)\rightleftharpoons 2H_2(g) + 2Br_2(g)...(ii)[/tex]
The expression of the equilibrium constant of the reaction (ii):
[tex]K_c'=\frac{[H_2]^2[Br_2]^2}{[HBr]^4}\\\\K_c'=(\frac{[H_2]^1[Br_2]^1}{[HBr]^2})^2[/tex]
Using [1]:
[tex]K_c'=(\frac{1}{K_c})^2\\\\K_c'=(\frac{1}{ 3.8\times 10^4})^2\\\\=6.9\times 10^{-10}[/tex]
The value of the missing equilibrium constant is [tex]6.9\times 10^{-10}[/tex].
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Both of the sulfur-oxygen double bonds in so2 is polar. in which direction should the polarity arrows point
Answer:
Away from the central sulfur atom.
Explanation:
Answer:
away from central sulfer atom
How are ionic bonds and van der waals forces similar
A sample of cold water was mixed with a sample of hot water inside a calorimeter, and 13,160 joules of heat energy were absorbed by the cold water. Which statement is true about the hot water in the calorimeter?
A. It released 26,320 joules.
B. It released 13,160 joules.
C. It absorbed 26,320 joules.
D. It absorbed 13,160 joules.
Answer:
B. It released 13,160 joules.
Explanation:
It is known that when mixing hot water with cold water at equilibrium:The amount of heat released from hot water = the amount of heat absorbed by cold water.
∵ 13,160 joules of heat energy were absorbed by the cold water.
∴ The hot water release 13,160 joules.
So, the right choice is: B. It released 13,160 joules.
Answer: Option (B) is the correct answer.
Explanation:
Two bodies of different temperature when come in contact with each other then heat is transferred from hot body to cold body until a thermal equilibrium is maintained between them.
So, when a sample of hot and cold water are mixed together then energy will be released by hot water which is actually absorbed by the cold water till temperature of both the liquids become equal.
Hence, when hot water has 13,160 joules of energy then this energy will be absorbed by a sample cold water. This means that hot water has released 13,160 joules of energy.
Hence, we can conclude that the true statement about the hot water in the calorimeter is that it released 13,160 joules.
The ability to travel great distances in the shortest time was achieved by which invention?
By space travel.
Or aeroplanes.
Whichever one is in your choices
If oil spills continue, all of the following should be expected except (2 points)
death of aquatic life.
polluted groundwater.
decreased soil productivity.
increased global temperatures.
Answer:
Polluted ground water.
Explanation:
The rocks through which water flows into the ground sieves most of the contaminants whose molecules are larger than most bacteria. Such molecules include but are not limited oil molecules. Therefore as it descends to the lower levels of the soil profile, water is subjected to continuous filtration by the layers and it is the least susceptible to contamination by oil spills.
Answer: Increased global temperature
Explanation:
There is no direct effect of oil spillage on climate or global unless the spillage does not caught fire.
Only in this case, huge amount of carbon dioxide will be released which affect the climate locally else oil spillage has no effect on the global temperature.
Death of aquatic animals, polluted ground water, decreased soil productivity are some of the consequences that can be seen in case of oil spillage.
Which of the following are acids or bases?
1. Sodium hydrogen
2. Barium hydroxide solution
3. Carbonate solution
Answer:
1. Sodium hydrogen - Base
2. Barium hydroxide solution - Acid
3. Carbonate solution - Base
Explanation:
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There are 3 different possible isomers of a dibromoethene molecule. what are these isomers?
Answer:
1,1-, (Z)-1,2-, and (E)-1,2-dibromoethene
Explanation:
Their structures are shown below.
The 1,2-dibromoethenes (2 and 3) are positional isomers
of 1,1-dibromoethene (1).
(Z)-1,2-dibromoethene (2) and (E)-1,2-dibromoethene (3) are stereoisomers (geometric isomers) of each other.
An engineer that designs buildings is a(n) _____.
A) civil engineer
B) mechanical engineer
C) Chemical engineer
D) aerospace engineer
Answer: It's a civil engineer
Explanation:
An engineer that designs buildings is a(n) A) civil engineer
Civil engineering is an engineering discipline that deals with the design and development of infrastructure like buildings, roads, bridges, and railways.
Civil engineers not only design and develop new infrastructure, but they also play an important role in rebuilding projects in instances like natural disaster
What are engineers that build houses called?Civil engineering deals in building houses, buildings, roads, bridges, and dams. So, the civil engineers are trained to handle all sorts of projects; simple to complex houses.
Who designs buildings and bridges?Architect: A person whose profession is designing and drawing plans for buildings, bridges and houses, as well as many other structures.
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Which of the following solvents will best dissolve wax, which is a complex mixture of compounds that mostly are CH3−CH2−CH2−CH2−CH2—? Structural formulas for molecules (a) (a) Hexane (a) Hexane is a six-carbon zigzag chain, with the terminal carbons single bonded to three Hs and all other Cs to two Hs. Structural formulas for molecules (b) (b) Benzene (b) Benzene is a six-membered ring with carbon as all of its vertices and alternating single and double bonds as the sides. Each carbon is also single bond-ed to H. Structural formulas for molecules (c) (c) Acetone (c) Acetone is a central C double bonded above to O and single bonded right and left, angled down, to CH3. Structural formulas for molecules (d) (d) Carbon tetrachloride (d) Carbon tetrachloride is a central C single bonded to four Cls. Structural formulas for molecules (e) (e) Water
Wax will be dissolved by nonpolar solvents: (a) hexane, (b) benzene and (d) carbon tetrachloride
Wax will not be dissolved by polar solvent such as (c) acetone and (e) water
Two solids are mixed in a flask and stirred. After a few minutes, the flask becomes cold.
Which of the following best describes this reaction?
A. an exothermic reaction
B. a combustion reaction
C. an endothermic reaction
D. a decomposition reaction
Answer:
C. an endothermic reaction
Explanation:
an endothermic reaction absorbs heat energy from its surroundings
The balanced equation for the reaction of copper (Cu) and silver nitrate (AgNO3) is shown below Cu+2AgNO3->2Ag+Cu(NO3)2 how many moles of copper must react to form 3.50 mol of Ag?
Answer:
1.75 mol of Cu
Explanation:
all you have to do is divide 3.50 by 2 because you need half moles from Ag
Answer: 1.75 mol of copper
Explanation: in the given balanced equation for the reaction of copper and silver nitrate, we can see that with one mol of copper, we can form two moles of silver (Ag), so we can calculate how many moles of copper we need to form 3.50 moles of Ag as follows:
3.50 moles of Ag *1 mol of copper/2 moles of Ag=
3.50mol of copper/2=
1.75 mol of copper
What type of reaction is represented by the following example? 2CO2 (g) + 4H2O (l) + 1452 kJ 2CH3OH (l) (g) + 3O2 (g) exothermic endothermic
endothermic
I hope this helped :)
Answer : The given reaction is an example of endothermic reaction.
Explanation :
Endothermic reaction : It is a type of chemical reaction in which the energy is absorbed by the surroundings. In this reaction, the energy of reactants are less than the energy of products. In this reaction, the energy is given to the system.
Exothermic reaction : It is a type of chemical reaction in which the energy is released into the surroundings. In this reaction, the energy of reactants are more than the energy of products. In this reaction, the energy is released from the system.
The given balanced chemical reaction is,
[tex]2CO_2(g)+4H_2O(l)+1452KJ\rightarrow 2CH_3OH(l)+3O_2(g)[/tex]
In this reaction, the 1452 KJ energy is given to the system. So, the given reaction is an example of endothermic reaction.
Air pressure is lowest in the lungs during whi h of the following points during inspiration or expiration
Answer:
Inspiration
Explanation:
This question is on application of Boyle's law; pressure is inversely proportional to volume.when we inhale air, the diaphragm and the muscles in the ribs contract thus increasing the volume in the lungs.Increased volume of the lungs cause the pressure to decrease.During exhaling, the diaphragm and muscles in the ribs relax, making the lungs to recoil and reduce in volume to force air out.Pressure in the lungs is increased than that in the environment making air to move out.
Answer: end of expiration when lung volume is the lowest
Explanation: Expiration is the opposite of inspiration
How are the following aspects of a reaction affected by the addition of a catalyst? 1) activation energy of the reverse reaction
a. Increased
b. Decreased
c. Not affected 2) Rate of the forward reaction
a. Increased
b. Decreased
c. Not affected 3) Rate of the reverse reaction
a. Increased
b. Decreased
c. Not affected 4) Activation energy of the forward reaction
a. Increased
b. Decreased
c. Not affected
These are four questions and four answers.
Answers:
1) activation energy of the reverse reaction
b. Decreased
2) Rate of the forward reaction
a. Increased
3) Rate of the reverse reaction
a. Increased
4) Activation energy of the forward reaction
b. decreased
Explanation:
Activarion energy is the energy required by the reactants to form the intermediate transition state and become products.
Catalysts are substances that change the path of the chemical reactions, lowering the activation energy, and thus speeding up the rate of the reactions, since the products can reach the new lower activation energy faster.
The equilibrium reactions are the chemical process in which two reactions, the forward and the reverese reactions, occur simultaneously and at the same rate. The equlibrium reactions may be represented by:
A ⇄ BWhere A → B is the direct or forward reaction, and A ← B is the reverse reaction (note the inversed arrow, from right to left).
For the direct reaction A represents the reactants and B represents the products. On the other hand, B represents the reactants and A represents the reactants of the reverse reaction and A. This, is A is the reactant of the forward reaction and the product of the reverse reaction, while B is the reactant of the reverse reaction and the product of the forward reaction.
Since, the addition of a catalyst lowers the activation energy of the process, the new activation energy is lower for both the forward and the reverse reaction, meaning that:
1. The activation energy of the reverse reaction is decreased (option b. of the first question)
2. The rate of the forward reaction is increased (option a. of the second question)
3. The rate of the reverse reaction is increased (option a. of the third question).
4. Activation energy of the forward reaction is decreased (option b. of the fourth question).
In summary, the addition of a catalyst decreases the activation energy for both forward and reverse reactions, and increases the rate of both forward and reverse reactions.
The following aspects of a reaction affected by the addition of a catalyst are
1) activation energy of the reverse reaction: b. Decreased2) Rate of the forward reaction: a. Increased3) Rate of the reverse reaction: a. Increased4) Activation energy of the forward reaction: b. decreasedExplanation:The following aspects of a reaction affected by the addition of a catalyst (it is a substance that enables a chemical reaction to proceed at a usually faster rate or under different conditions (as at a lower temperature) than otherwise possible) are
1) activation energy of the reverse reaction: b. Decreased
Energy of activation is the energy that must be provided to a chemical or nuclear system with potential reactants to result in: a chemical reaction, nuclear reaction, or other physical phenomena.
2) Rate of the forward reaction: a. Increased
Forward reaction is the reaction that products are produced from reactants and it goes from left to right in a reversible reaction.
3) Rate of the reverse reaction: a. Increased
A reversible reaction is a reaction in which the reactants form products react together to give the reactants back.
4) Activation energy of the forward reaction: b. decreased
The activation energy for the forward reaction is the free energy amount that must be added to go from the energy level of the reactants to the energy level of the transition state
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At STP, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver
Answer:
Silver
Explanation:
because it is a trasition metal and are good condutors
Among nitrogen, neon, sulfur, and silver, silver is the best conductor of electricity at STP because it's a metal and carries free electrons that allow electrical flow.
Explanation:At Standard Temperature and Pressure (STP), the best conductor of electricity among the options provided (nitrogen, neon, sulfur, and silver) is silver. This is because electrical conductivity is a property of metals and silver is a metal, while nitrogen, neon, and sulfur are non-metals. Metals have 'free electrons' that move around and allow the flow of electricity, and among many metals, silver is known for its high electrical conductivity.
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