Rate and Extent of Chemical Change Practice Questions
GCSE · GCSE Chemistry · 146 free MCQs with instant results and detailed explanations.
146
Total
47
Easy
72
Medium
27
Hard
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Sample Questions from Rate and Extent of Chemical Change
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Q1
Easy
When the temperature of a reaction is increased, what effect does this have on the reaction rate?
A.
The reaction rate decreases.
B.
The reaction rate remains the same.
C.
The reaction rate increases.
D.
The reaction stops.
Show Answer & Explanation
Correct Answer: C
Increasing the temperature generally increases the reaction rate because particles have more energy and collide more frequently and with greater force.
Q2
Easy
In a reaction where the surface area of a solid reactant is increased, what is the expected effect on the reaction rate?
A.
The reaction rate decreases.
B.
The reaction rate increases.
C.
The reaction rate is unaffected.
D.
The reaction becomes exothermic.
Show Answer & Explanation
Correct Answer: B
Increasing the surface area of a solid reactant allows more particles to collide with the other reactants, thus increasing the reaction rate.
Q3
Easy
What effect does increasing the temperature generally 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 stops the reaction completely.
Show Answer & Explanation
Correct Answer: B
Increasing the temperature provides more energy to the reactant molecules, which leads to more frequent and effective collisions, thus increasing the rate of reaction.
Q4
Medium
Which of the following factors does NOT affect the rate of a chemical reaction?
A.
Temperature
B.
Pressure
C.
Color of the reactants
D.
Concentration of reactants
Show Answer & Explanation
Correct Answer: C
The color of the reactants does not influence the rate of the reaction; however, temperature, pressure, and concentration do impact reaction rates significantly.
Q5
Medium
A reactant is dissolved in water and the temperature is increased. What effect does this have on the rate of 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 causes the reaction to stop.
Show Answer & Explanation
Correct Answer: B
Increasing the temperature increases the kinetic energy of the molecules, leading to more frequent and energetic collisions, thus speeding up the rate of reaction.
Q6
Medium
A student measures the rate of a reaction at different concentrations. The results show that as concentration increases, the rate also increases. What type of relationship is this?
A.
Inversely proportional
B.
Directly proportional
C.
Exponential
D.
Logarithmic
Show Answer & Explanation
Correct Answer: B
The relationship between concentration and rate of reaction is directly proportional, meaning that an increase in concentration leads to a proportional increase in the rate of reaction.
Q7
Medium
When increasing surface area of a solid reactant, what is the expected outcome on the rate of reaction?
A.
The rate decreases.
B.
The rate increases.
C.
The rate remains constant.
D.
The rate becomes unpredictable.
Show Answer & Explanation
Correct Answer: B
Increasing the surface area of a solid reactant allows more particles to be available for collisions with reactants, thus increasing the rate of reaction.
Q8
Hard
A reaction between A and B produces C. If the concentration of A is doubled while keeping B constant, what general effect does this have on the rate of reaction, assuming the reaction is first order with respect to A?
A.
The rate of reaction will double.
B.
The rate of reaction will remain unchanged.
C.
The rate of reaction will quadruple.
D.
The rate of reaction will increase but not double.
Show Answer & Explanation
Correct Answer: A
For a first-order reaction with respect to A, the rate is directly proportional to the concentration of A. Doubling A's concentration will lead to the rate also doubling, as described by the rate equation.
Q9
Hard
A student measures the time taken for a fixed volume of gas to be produced in a reaction at different temperatures. If the time taken at 25°C is 60 seconds and at 35°C is 30 seconds, what conclusion can be drawn about the effect of temperature on the rate of reaction?
A.
Increasing temperature decreases the reaction rate.
B.
Temperature has no effect on the rate of reaction.
C.
Higher temperatures increase the reaction rate significantly.
D.
The reaction rate is slower at higher temperatures.
Show Answer & Explanation
Correct Answer: C
The data shows that as temperature increases from 25°C to 35°C, the time taken for the reaction decreases from 60 seconds to 30 seconds, indicating that the reaction rate increases significantly with temperature.
Q10
Hard
Which of the following factors would most significantly increase the rate of a chemical reaction between magnesium and hydrochloric acid?
A.
Increasing the concentration of hydrochloric acid
B.
Using larger pieces of magnesium
C.
Decreasing the temperature of the reaction
D.
Adding a catalyst that slows down the reaction
Show Answer & Explanation
Correct Answer: A
Increasing the concentration of hydrochloric acid increases the number of reactant particles in a given volume, leading to more frequent collisions and thus a faster reaction rate.
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Rate and Extent of Chemical Change — GCSE GCSE Chemistry Practice Questions Online
This page contains 146 practice MCQs for the chapter Rate and Extent of Chemical Change in GCSE GCSE Chemistry. The questions are organized by difficulty — 47 easy, 72 medium, 27 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.