Rate of Reaction Practice Questions
SPM (Malaysia) · SPM Chemistry · 143 free MCQs with instant results and detailed explanations.
143
Total
43
Easy
72
Medium
28
Hard
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Sample Questions from Rate of Reaction
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What effect does increasing the temperature have on the rate of a chemical reaction?
A.
It decreases the rate of reaction.
B.
It increases the rate of reaction.
C.
It has no effect on the rate of reaction.
D.
It changes the equilibrium position.
Show Answer & Explanation
Correct Answer: B
Increasing the temperature provides more energy to the reacting particles, resulting in more frequent and energetic collisions, which increases the rate of reaction.
Q2
Easy
In a reaction where a solid reactant is involved, how can the rate of reaction be increased?
A.
By increasing the size of the solid particles.
B.
By decreasing the concentration of reactants.
C.
By increasing the surface area of the solid.
D.
By lowering the temperature.
Show Answer & Explanation
Correct Answer: C
Increasing the surface area of a solid reactant allows more particles to collide with the liquid or gas reactants, thus increasing the rate of reaction.
Q3
Easy
If the concentration of a reactant is doubled, what is the likely effect on the rate of reaction, assuming the reaction order is first order?
A.
The rate becomes four times faster.
B.
The rate becomes twice as fast.
C.
The rate remains unchanged.
D.
The rate becomes half as fast.
Show Answer & Explanation
Correct Answer: B
In a first-order reaction, the rate is directly proportional to the concentration of the reactant. Doubling the concentration will double the rate of reaction.
Q4
Medium
What effect does increasing the temperature have on the rate of a chemical reaction?
A.
It decreases the rate of reaction.
B.
It increases the rate of reaction.
C.
It has no effect on the reaction rate.
D.
It can stop the reaction completely.
Show Answer & Explanation
Correct Answer: B
Increasing the temperature provides more energy to the reactant molecules, resulting in more frequent and effective collisions, thereby increasing the rate of reaction.
Q5
Medium
If the concentration of reactants in a reaction is doubled, what would likely happen to the rate of reaction?
A.
It remains unchanged.
B.
It doubles.
C.
It quadruples.
D.
It decreases.
Show Answer & Explanation
Correct Answer: B
According to collision theory, doubling the concentration of reactants increases the number of particles available for collision, which typically doubles the frequency of collisions and hence, doubles the rate of reaction.
Q6
Medium
Which factor is NOT a part of the rate of reaction according to the collision theory?
A.
Frequency of collisions.
B.
Energy of collisions.
C.
Nature of reactants.
D.
Volume of the reaction vessel.
Show Answer & Explanation
Correct Answer: D
The rate of reaction is influenced by the frequency and energy of collisions and the nature of reactants, but the volume of the reaction vessel itself does not directly affect the rate of reaction.
Q7
Medium
In an experiment, if the rate of a reaction is determined to be 0.5 mol/L·s, what will the rate be if the temperature is increased by 10°C, assuming a general rule of the rate doubling with every 10°C increase?
A.
0.5 mol/L·s
B.
1.0 mol/L·s
C.
2.0 mol/L·s
D.
2.5 mol/L·s
Show Answer & Explanation
Correct Answer: B
If the rate doubles for every 10°C increase in temperature, starting from a rate of 0.5 mol/L·s, the new rate will be 1.0 mol/L·s after the temperature increase.
Q8
Hard
In a reaction where the rate of reaction doubles when the temperature increases from 25°C to 35°C, what is the approximate activation energy for this reaction according to the Arrhenius equation?
A.
40 kJ/mol
B.
80 kJ/mol
C.
100 kJ/mol
D.
120 kJ/mol
Show Answer & Explanation
Correct Answer: C
The Arrhenius equation suggests that the rate of reaction increases exponentially with temperature. A doubling of the rate can be estimated to correlate with an activation energy of around 100 kJ/mol based on typical values in this range.
Q9
Hard
A catalyst is added to a reaction between A and B to increase the rate of product formation. What is the primary way through which the catalyst affects the reaction rate?
A.
It increases the activation energy needed for the reaction.
B.
It lowers the activation energy of the reaction.
C.
It increases the concentration of reactants.
D.
It decreases the temperature of the reaction mixture.
Show Answer & Explanation
Correct Answer: B
A catalyst increases the rate of a reaction by lowering the activation energy barrier, allowing more molecules to collide with enough energy to react. This leads to an increase in the rate of product formation.
Q10
Hard
A reaction between reactants A and B produces product C. If the rate of reaction doubles when the concentration of A is tripled, what is the order of the reaction with respect to A?
A.
1
B.
2
C.
0
D.
3
Show Answer & Explanation
Correct Answer: A
The order of the reaction with respect to a reactant is determined by how the rate changes with its concentration. Here, tripling the concentration of A results in doubling the rate, indicating a first-order dependence (1). In first-order reactions, if you increase the concentration by a factor of n, the rate increases by a factor of n.
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Rate of Reaction — SPM (Malaysia) SPM Chemistry Practice Questions Online
This page contains 143 practice MCQs for the chapter Rate of Reaction in SPM (Malaysia) SPM Chemistry. The questions are organized by difficulty — 43 easy, 72 medium, 28 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.