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Essential Chemistry for IGCSE - Rate Of Reaction (Section 1)

1
Which of the following is an example of a physical property that can be measured to determine the rate of a reaction?
Answer
(D)
All of the above.
2
How does increasing the surface area of a solid reactant affect the rate of reaction?
Answer
(B)
Increases the reaction rate.
3
What is the effect of a negative catalyst (inhibitor) on the rate of reaction?
Answer
(B)
Decreases the rate.
4
What is the effect of adding a catalyst to a chemical reaction?
Answer
A
B
C
5
What is the primary function of a catalyst in a chemical reaction?
Answer
(B)
To lower the activation energy and provide an alternative reaction pathway.
6
What is the main reason for using a catalyst in a chemical reaction?
Answer
(C)
To speed up the reaction.
7
What is the effect of a catalyst on the activation energy of a reaction?
Answer
(A)
It lowers the activation energy.
8
Which of the following is/are true about catalysts?
Answer
A
C
D
9
How does surface area affect the rate of reaction in a solid-liquid reaction?
Answer
(A)
Increasing the surface area increases the rate.
10
What is the effect of a catalyst on the activation energy of a reaction?
Answer
(B)
Decreases activation energy
11
Which of the following is a condition that must be met, according to collision theory, for a reaction to occur?
Answer
(C)
Reactant molecules must collide with sufficient energy and correct orientation.
12
For a chemical reaction to occur, what conditions must be met?
Answer
A
B
13
If the rate of a reaction doubles when the concentration of a reactant is doubled, the reaction is said to be:
Answer
(B)
First order
14
What is the relationship between reaction rate and the activation energy?
Answer
(B)
As activation energy decreases, the reaction rate increases.
15
What happens to the rate of a reaction when the concentration of reactants is increased?
Answer
(C)
The rate of reaction increases.
16
How does the surface area of a solid reactant influence the rate of a reaction?
Answer
(B)
Increasing the surface area increases the rate.
17
If the reaction rate doubles when you double the concentration of one reactant, the order is:
Answer
(B)
First order.
18
Which of the following is an example of a heterogeneous catalyst?
Answer
(B)
A solid metal surface.
19
How does increasing temperature affect the rate of a chemical reaction?
Answer
(A)
It increases the rate of the reaction.
20
Which of the following is a key factor in determining the rate of a chemical reaction?
Answer
(B)
The activation energy of the reaction.
21
Why does increasing the temperature increase the rate of reaction?
Answer
(D)
Both 1 and 3
22
Which of the following will typically increase the rate of a chemical reaction?
Answer
A
B
C
D
23
Which of the following statements is true about the effect of temperature on reaction rate?
Answer
(C)
Increasing temperature provides the particles with more energy, thus increasing the reaction rate.
24
How does a catalyst speed up a chemical reaction?
Answer
(B)
By decreasing the activation energy.
25
How does increasing the temperature affect the frequency of successful collisions in a reaction?
Answer
(A)
Increases the frequency of successful collisions.
26
If a reaction is zero order with respect to a reactant, what can be concluded?
Answer
(A)
The rate of the reaction does not depend on the concentration of that reactant.
27
Which of the following would decrease the rate of a reaction?
Answer
(B)
Decreasing the surface area
28
Which of the following is the best method for measuring the rate of a reaction that produces a gas?
Answer
(B)
Measuring the change in volume of gas produced.
29
How is the rate of a reaction measured?
Answer
(B)
By measuring the change in concentration over time.
30
What happens to the frequency of successful collisions when the temperature of a reaction is increased?
Answer
(A)
Increases
31
How does decreasing the particle size of a solid reactant generally affect the rate of reaction?
Answer
(B)
Increases the rate of reaction.
32
If a reaction is described as first-order with respect to a reactant, what can you infer about the rate of the reaction?
Answer
(B)
The rate is directly proportional to the concentration of that reactant.
33
What is the effect on the rate of reaction if you increase the temperature?
Answer
(B)
It increases the rate of reaction
34
Which of the following describes how a catalyst increases the rate of a reaction?
Answer
(B)
It lowers the activation energy.
35
Which of the following factors will increase the rate of a chemical reaction?
Answer
A
B
C
D
36
What is the effect of increasing the concentration of reactants on the frequency of collisions between reacting particles?
Answer
(B)
It increases the frequency of collisions.
37
What is the effect of increasing the concentration of reactants on the rate of reaction?
Answer
(A)
Increases the rate.
38
If the rate of a reaction is proportional to the square of the concentration of a reactant, what is the reaction order with respect to that reactant?
Answer
(C)
Second order
39
Which of the following is a factor that can affect the rate of a chemical reaction?
Answer
(D)
All of the above
40
How does the surface area of solid reactants affect the rate of a reaction?
Answer
(A)
Increasing the surface area increases the rate of the reaction.
41
What is the relationship between the rate constant and the temperature of a reaction?
Answer
(C)
The rate constant increases with increasing temperature.
42
If the rate of a reaction is independent of the concentration of a reactant, the reaction is:
Answer
(A)
Zero order.
43
What is the relationship between the rate of reaction and the temperature, according to collision theory?
Answer
(B)
Increasing temperature increases both the number and the effectiveness of collisions.
44
What is the main goal when investigating the rate of reaction?
Answer
(B)
To determine the speed at which the reactants are used up or products are formed.
45
What effect does the addition of an inhibitor have on the rate of a chemical reaction?
Answer
(B)
Decreases the rate.
46
Which of the following will increase the rate of reaction between a solid and a liquid?
Answer
(B)
Increasing the surface area of the solid.
47
What effect does increasing the concentration of reactants have on the frequency of collisions between reacting particles?
Answer
(A)
Increases the frequency of collisions.
48
Which of the following describes the effect of an inhibitor on a reaction?
Answer
(B)
It slows down the reaction.
49
Which of the following factors influence the rate of a reaction?
Answer
A
B
C
D
50
In a reaction, the rate of reaction can be determined by plotting
Answer
(D)
all of the above