Chemical Changes Practice Questions
GCSE · GCSE Chemistry · 140 free MCQs with instant results and detailed explanations.
140
Total
44
Easy
69
Medium
27
Hard
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Sample Questions from Chemical Changes
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is produced when an acid reacts with a metal carbonate?
A.
Salt, water, and carbon dioxide
B.
Hydrogen gas and salt
C.
Only water
D.
Oxygen gas and salt
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Correct Answer: A
When an acid reacts with a metal carbonate, it produces salt, water, and carbon dioxide gas as the products of the reaction.
Q2
Easy
Which of the following statements is true regarding oxidation?
A.
Oxidation is the gain of electrons.
B.
Oxidation is the loss of protons.
C.
Oxidation is the loss of electrons.
D.
Oxidation occurs only in acids.
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Correct Answer: C
Oxidation is defined as the loss of electrons in a chemical reaction, which is fundamental to many redox processes.
Q3
Easy
Which of the following is a common indicator used to identify a neutral solution?
A.
Litmus
B.
Phenolphthalein
C.
Bromothymol blue
D.
Universal indicator
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Correct Answer: D
Universal indicator can show a range of pH values and is effective in identifying neutral solutions, typically at pH 7.
Q4
Medium
What is the main product when sodium reacts with water?
A.
Sodium hydroxide and hydrogen gas
B.
Sodium oxide
C.
Sodium chloride
D.
Hydrochloric acid
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Correct Answer: A
When sodium reacts with water, it produces sodium hydroxide and hydrogen gas. This exothermic reaction leads to the formation of the alkaline hydroxide, which is responsible for the strong basicity.
Q5
Medium
Which of the following statements is true about acids and bases?
A.
Acids turn litmus paper blue.
B.
Bases react with metals to produce hydrogen gas.
C.
Neutral solutions have a pH of 7.
D.
Acids are slippery to touch.
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Correct Answer: C
Neutral solutions, such as pure water, have a pH of 7, which indicates they are neither acidic nor basic. This is a fundamental property in chemistry regarding pH levels.
Q6
Medium
What is the primary method of extracting metals from their ores?
A.
Electrolysis
B.
Filtration
C.
Evaporation
D.
Distillation
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Correct Answer: A
Electrolysis is the primary method for extracting reactive metals such as aluminium from their ores. This process uses electrical energy to break down ionic compounds into their elements.
Q7
Medium
Which gas is produced during the fermentation process?
A.
Oxygen
B.
Carbon dioxide
C.
Nitrogen
D.
Hydrogen
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Correct Answer: B
During fermentation, sugars are converted into alcohol and carbon dioxide by yeast. The carbon dioxide produced is what makes fermentation significant in processes such as bread and alcohol production.
Q8
Hard
Which of the following statements about the reactivity series of metals is true?
A.
Potassium can displace copper from copper sulfate solution.
B.
Gold is more reactive than aluminum.
C.
Iron cannot displace zinc from zinc sulfate solution.
D.
Calcium is less reactive than sodium.
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Correct Answer: A
Potassium is higher in the reactivity series than copper, meaning it can displace copper from copper sulfate solution. This is a fundamental principle of the reactivity series where more reactive metals can displace less reactive ones.
Q9
Hard
What is the result of the electrolysis of brine?
A.
Hydrogen gas and chlorine gas are produced.
B.
Sodium hydroxide is produced in large amounts.
C.
Only hydrogen gas is produced.
D.
Chlorine gas and sodium are produced.
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Correct Answer: A
During the electrolysis of brine (saltwater), hydrogen gas is produced at the cathode and chlorine gas at the anode. Sodium ions remain in solution and do not form sodium metal under these conditions.
Q10
Hard
Which of the following statements correctly describes an endothermic reaction?
A.
It releases heat to the surroundings.
B.
It absorbs heat from the surroundings.
C.
It occurs spontaneously without external energy.
D.
It results in an increase in temperature of the reactants.
Show Answer & Explanation
Correct Answer: B
An endothermic reaction is characterized by the absorption of heat from the surroundings, resulting in a temperature decrease in the environment around the reaction. This is why option B is correct.
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Chemical Changes — GCSE GCSE Chemistry Practice Questions Online
This page contains 140 practice MCQs for the chapter Chemical Changes in GCSE GCSE Chemistry. The questions are organized by difficulty — 44 easy, 69 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.