AnswersChemistry - SC3210 A-CRLab: Reaction Rate

Catalysts Answers

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1
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Which statement describes a heterogeneous catalyst?

A
It is in a different phase than the reactants.
B
It is in the same phase as the reactants.
C
It increases the activation energy of a reaction.
D
It lowers the reaction rate.
2
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The second reaction in the formation of sulfuric acid occurs slowly.NO2 is added to the reaction to speed it up. In which form would this substance be a homogeneous catalyst for this reaction?

Question illustration
A
NO2(g)
B
NO2(l)
C
NO2(s)
D
NO2(aq)
3

Although expensive, platinum is used as a catalyst to break down harmful gases in car exhaust into less harmful gases. Which statement best describes platinum in this use?

A
It is a homogeneous catalyst, so only a small amount is needed even though it exits with the products.
B
It is a heterogeneous catalyst, so only a small amount is needed and it is easily separated from the products.
C
It is a homogeneous catalyst, so although a large amount is needed, it is easily separated from the products.
D
It is a heterogeneous catalyst, so a large amount is needed and it exits with the products.
4

What overall effect does adding a catalyst have on a chemical reaction?

A
It increases pressure on the system.
B
It increases reactant surface area.
C
It lowers the activation energy that is needed.
D
It lowers the concentration of reactants.
5

Which statement defines activation energy?

A
It is the sum of the maximum energy and reactant energy.
B
It is the sum of the product energy and reactant energy.
C
It is the difference between reactant energy and maximum energy.
D
It is the difference between product energy and reactant energy.
6

Which statement describes a catalyst?

A
Catalysts appear as reactants in a chemical equation.
B
Catalysts are completely consumed by the reaction.
C
Catalysts provide a lower energy pathway for the reaction.
D
Catalysts speed up chemical reactions by increasing surface area.
7

Which of the following statements describes how enzymes differ from ordinary chemical catalysts?

A
Enzymes are inorganic in nature.
B
Enzymes catalyze select chemical reactions.
C
Enzymes bind their substrates for a brief time.
D
Enzymes increase the rate of a chemical reaction.
8

A reaction is shown below.Reaction : What can be concluded about this reaction?

Question illustration
A
A homogeneous catalyst is being used in the reaction.
B
A heterogeneous catalyst is being used in the reaction.
C
A catalyst is not being used in this reaction.
D
An enzyme is being used in this reaction.
9

Consider the energy diagram below.Which statement best describes the diagram?

Question illustration
A
The catalyzed reaction passes through C.
B
The energy of the catalyst is shown by A.
C
The reaction pathway through B is faster.
D
The energy of the reactants with catalyst is at D.
10

Which reaction is an example of heterogeneous catalysis?

A
Ethene gas reacts with hydrogen gas by using a nickel catalyst.
B
Hydrogen peroxide decomposes by using an aqueous iodide ion catalyst.
C
Formic acid decomposes by using an acidic catalyst.
D
Sulfur dioxide gas is converted to sulfur trioxide gas by using nitrogen chloride gas.
11

Which statement defines activation energy?

A
It is the sum of the maximum energy and reactant energy.
B
It is the sum of the product energy and reactant energy.
C
It is the difference between reactant energy and maximum energy.
D
It is the difference between product energy and reactant energy.
12

Which catalyzed reaction breaks up ozone?

A
2H2O2(l) 2H2O(l) + O2
Option A
B
O3 + O 2O2
Option B
C
2H2O2 (aq) 2H2O(l) + O2
Option C
D
O2 + 2SO2 2SO3
Option D
13

What overall effect does adding a catalyst have on a chemical reaction?

A
It increases pressure on the system.
B
It increases reactant surface area.
C
It lowers the activation energy that is needed.
D
It lowers the concentration of reactants.
14

Hydrogen gas reacts rapidly with oxygen gas in the presence of a platinum catalyst. Which equation correctly represents this reaction?

A
Upper H subscript 2 (g) plus upper O subscript 2 (g) plus upper P t right arrow upper H subscript (g) plus upper O subscript 2 (g).
Option A
B
Upper H subscript 2 (g) plus upper O subscript 2 (g) right arrow upper H subscript 2 (g) plus upper O subscript 2 (g) plus upper P t.
Option B
C
2 upper H subscript 2 (g) plus upper O subscript 2 (g) right arrow with upper P t above it, 2 upper H subscript (g) plus upper O subscript 2 (g) plus upper P t.
Option C
D
2 upper H subscript 2 (g) plus upper O subscript 2 (g) right arrow with upper P t above it, 2 upper H subscript (g) plus upper O subscript 2 (g).
Option D
15

Which statement best describes the use of a catalyst in a fuel cell?

A
It reduces waste.
B
It lowers energy requirements.
C
It reduces toxic exhaust.
D
It increases reaction rates.
16

Which statement describes a catalyst?

A
Catalysts appear as reactants in a chemical equation.
B
Catalysts are completely consumed by the reaction.
C
Catalysts provide a lower energy pathway for the reaction.
D
Catalysts speed up chemical reactions by increasing surface area.

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