Energy Changes Practice Questions
GCSE · GCSE Chemistry · 150 free MCQs with instant results and detailed explanations.
150
Total
47
Easy
79
Medium
24
Hard
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Sample Questions from Energy Changes
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What type of reaction absorbs heat from the surroundings?
A.
Exothermic
B.
Endothermic
C.
Neutral
D.
Combustion
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Correct Answer: B
Endothermic reactions absorb heat from the surroundings, resulting in a decrease in temperature. Exothermic reactions release heat, which is the opposite.
Q2
Easy
Which of the following is an example of an exothermic reaction?
A.
Dissolving ammonium nitrate in water
B.
Burning a candle
C.
Photosynthesis
D.
Melting ice
Show Answer & Explanation
Correct Answer: B
Burning a candle is an exothermic reaction because it releases heat and light when wax combusts. The other options either absorb heat or are not exothermic processes.
Q3
Easy
Which process absorbs energy from the surroundings?
A.
Endothermic reaction
B.
Exothermic reaction
C.
Combustion reaction
D.
Oxidation reaction
Show Answer & Explanation
Correct Answer: A
An endothermic reaction is characterized by the absorption of energy, typically in the form of heat, from the surroundings, resulting in a temperature drop in the environment.
Q4
Medium
Which of the following processes is exothermic?
A.
Combustion of methane
B.
Dissolving ammonium nitrate in water
C.
Melting of ice
D.
Evaporation of water
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Correct Answer: A
The combustion of methane releases heat and light, making it an exothermic reaction, while the others absorb energy.
Q5
Medium
When 25g of potassium chloride dissolves in water, the temperature of the solution decreases. What type of energy change occurs?
A.
Exothermic
B.
Endothermic
C.
Thermal
D.
Nuclear
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Correct Answer: B
The decrease in temperature indicates that energy is absorbed from the surroundings, which characterizes an endothermic process.
Q6
Medium
If a reaction has a higher energy of products compared to reactants, what can be inferred about the process?
A.
It is exothermic.
B.
It is endothermic.
C.
It is spontaneous.
D.
It is at equilibrium.
Show Answer & Explanation
Correct Answer: B
A higher energy of products compared to reactants indicates that energy was absorbed, which is characteristic of an endothermic reaction.
Q7
Medium
In an energy diagram for a reaction, the energy of the reactants is lower than that of the products. What does this imply?
A.
The reaction releases energy.
B.
The reaction absorbs energy.
C.
The reaction occurs spontaneously.
D.
The reaction is at a stable state.
Show Answer & Explanation
Correct Answer: B
When the energy of the products is higher than that of the reactants, it indicates that the reaction absorbed energy, thus it is endothermic.
Q8
Hard
During an exothermic reaction, which of the following statements is true regarding the energy changes involved?
A.
Energy is absorbed from the surroundings, causing a temperature drop.
B.
Energy is released to the surroundings, causing a temperature rise.
C.
The total energy of the reactants is greater than the products.
D.
None of the above.
Show Answer & Explanation
Correct Answer: B
In an exothermic reaction, energy is released to the surroundings, leading to an increase in temperature. This means that the energy of the products is lower than that of the reactants.
Q9
Hard
A student measures the temperature change when 5 g of magnesium reacts with hydrochloric acid. If the temperature increases from 20°C to 35°C, what is the approximate energy released (in joules) assuming that the specific heat capacity of the solution is 4.18 J/g°C and the total mass of the solution is 100 g?
A.
627 J
B.
750 J
C.
1700 J
D.
1400 J
Show Answer & Explanation
Correct Answer: A
The energy can be calculated using the formula Q = mcΔT. Here, m = 100 g, c = 4.18 J/g°C, and ΔT = (35 - 20) = 15°C. Thus, Q = 100 * 4.18 * 15 = 627 J.
Q10
Hard
In an exothermic reaction, what happens to the energy of the reactants compared to the products?
A.
The energy of the products is higher than that of the reactants.
B.
The energy of the reactants is equal to that of the products.
C.
The energy of the reactants is higher than that of the products.
D.
The energy of the reactants and products cannot be compared.
Show Answer & Explanation
Correct Answer: C
In an exothermic reaction, the reactants release energy, resulting in the products having lower energy compared to the reactants.
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Energy Changes — GCSE GCSE Chemistry Practice Questions Online
This page contains 150 practice MCQs for the chapter Energy Changes in GCSE GCSE Chemistry. The questions are organized by difficulty — 47 easy, 79 medium, 24 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.