Chemical Change Practice Questions
Matric (South Africa) · Matric Physical Sciences · 150 free MCQs with instant results and detailed explanations.
150
Total
43
Easy
80
Medium
27
Hard
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Sample Questions from Chemical Change
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following is an example of a chemical change?
A.
Melting of ice
B.
Dissolving sugar in water
C.
Burning wood
D.
Chopping vegetables
Show Answer & Explanation
Correct Answer: C
Burning wood is a chemical change because it results in the transformation of wood into ash and gases, thus creating new substances.
Q2
Easy
During a chemical change, which of the following is NOT typically observed?
A.
Color change
B.
Temperature change
C.
Change in shape
D.
Formation of gas
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Correct Answer: C
Change in shape is usually associated with physical changes; during a chemical change, observable changes include color change, temperature change, and formation of gas.
Q3
Easy
What is the main indicator of a chemical change during a reaction?
A.
Color change
B.
Change in state
C.
Temperature change
D.
All of the above
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Correct Answer: D
A chemical change often involves observable changes such as a color change, a change in state (solid, liquid, gas), or a temperature change, indicating that a new substance has formed.
Q4
Medium
What is the main indicator of a chemical change occurring in a substance?
A.
Formation of a solid
B.
Change in shape
C.
Dissolution in water
D.
Color change
Show Answer & Explanation
Correct Answer: D
A color change often indicates a chemical reaction has occurred, as new substances with different properties are formed.
Q5
Medium
Which of the following processes is a chemical change?
A.
Melting of ice
B.
Burning of wood
C.
Dissolving sugar in water
D.
Evaporation of alcohol
Show Answer & Explanation
Correct Answer: B
Burning of wood is a chemical change as it results in new substances (ash, smoke) being formed, while the other processes are physical changes.
Q6
Medium
An experiment shows that combining vinegar and baking soda produces bubbles and a temperature change. What type of change is this?
A.
Physical change
B.
Chemical change
C.
Phase change
D.
Nuclear change
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Correct Answer: B
The reaction between vinegar and baking soda is a chemical change, producing carbon dioxide gas (bubbles) and resulting in a temperature change.
Q7
Medium
Which of the following is an example of a chemical change in cooking?
A.
Boiling water
B.
Baking a cake
C.
Freezing fruit
D.
Chopping vegetables
Show Answer & Explanation
Correct Answer: B
Baking a cake involves chemical changes as ingredients react to form new substances (cake), while the other options are physical changes.
Q8
Hard
Which of the following statements best describes a chemical change?
A.
The substance retains its original properties after the change.
B.
The change is reversible and can be undone.
C.
New substances with different properties are formed.
D.
The mass of the substances remains unchanged.
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Correct Answer: C
A chemical change results in the formation of new substances, which have different properties from the original substances. In contrast, physical changes may retain the original properties.
Q9
Hard
When 4.0 g of magnesium metal reacts with oxygen to form magnesium oxide, what is the mass of oxygen consumed if the total mass of magnesium oxide produced is 6.0 g?
A.
2.0 g
B.
4.0 g
C.
6.0 g
D.
1.0 g
Show Answer & Explanation
Correct Answer: A
According to the law of conservation of mass, the mass of the reactants (magnesium + oxygen) must equal the mass of the products (magnesium oxide). Therefore, if 4.0 g of magnesium is used, the mass of oxygen must be 6.0 g - 4.0 g = 2.0 g.
Q10
Hard
What is the effect of increasing the concentration of reactants on the rate of a chemical reaction according to the collision theory?
A.
The rate decreases due to fewer collisions.
B.
The rate remains constant as concentration doesn't affect speed.
C.
The rate increases due to more frequent collisions.
D.
The rate decreases due to an increase in temperature.
Show Answer & Explanation
Correct Answer: C
According to collision theory, increasing the concentration of reactants provides more reactant particles in a given volume, leading to more frequent collisions. This increased collision frequency results in a higher reaction rate.
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Chemical Change — Matric (South Africa) Matric Physical Sciences Practice Questions Online
This page contains 150 practice MCQs for the chapter Chemical Change in Matric (South Africa) Matric Physical Sciences. The questions are organized by difficulty — 43 easy, 80 medium, 27 hard — so you can choose the right level for your preparation.
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