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Free Year 8 Chemistry Practice Quiz on Conservation of Mass
This free, auto-scored Chemistry quiz on Conservation of Mass is designed to help parents instantly see whether their child truly understands the concept or is just memorising answers.
With a timer, instant score, and exam-style questions, this practice quiz builds real confidence — not panic — before assessments.
🧪 Conservation of Mass
Year 8 Chemistry • 50 Practice Questions
Part A: Multiple Choice Questions (1–20)
1. What does the law of conservation of mass state?
Correct answer: C
2. The total mass of reactants is _____ the total mass of products.
Correct answer: C
3. Which particles are conserved in chemical reactions?
Correct answer: B
4. What unit is used to measure mass?
Correct answer: C
5. The substances at the start of a reaction are called:
Correct answer: B
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Correct answer: C
7. What happens to atoms in a chemical reaction?
Correct answer: C
8. Which system prevents mass loss?
Correct answer: B
9. Why does magnesium gain mass when burned?
Correct answer: C
10. Which gas often escapes during reactions?
Correct answer: C
11. Mass change is usually due to:
B
Correct answer: B
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Book a Free Consultation12. Burning magnesium forms:
B
13. Which tool measures mass?
B
14. Mass is a measure of:
B
15. Which reaction shows mass gain?
B
16. Atoms in products come from:
B
17. The law of conservation of mass applies:
C
18. Gases escaping causes mass to:
C
19. Closed systems are used to:
C
20. Matter is made up of:
B
Part B: Fill in the Blanks (21–35)
21. Mass is measured in __________.
grams
22. Substances at the start are called __________.
reactants
23. New substances formed are called __________.
products
24. Atoms are __________ during reactions.
rearranged
25. Mass is always __________ in reactions.
conserved
26. A system that prevents mass loss is __________.
closed
27. Magnesium reacts with __________.
oxygen
28. Oxygen is a __________.
reactant
29. Gas escaping causes mass to __________.
appear to decrease
Correct answer: B
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Book a Free Consultation30. Burning is a __________ reaction.
chemical
31. Matter is made of __________.
atoms
32. Mass before equals mass __________.
after
Correct answer: B
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Book a Free Consultation33. Oxygen adds __________ when reacting.
mass
34. Atoms cannot be __________.
destroyed
35. The law of conservation of mass applies __________.
always
Part C: True or False (36–50)
36. Mass can disappear during reactions.
False
37. Atoms rearrange in reactions.
True
38. Magnesium gains mass when burned.
True
39. Gases escaping affect mass readings.
True
40. Atoms are destroyed in reactions.
False
41. Mass is conserved in all reactions.
True
Correct answer: B
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Book a Free Consultation42. Open systems prevent gas escape.
False
43. Closed systems show conservation clearly.
True
44. Burning breaks the law of mass.
False
45. Oxygen adds mass during reactions.
True
46. Mass depends on gravity.
False
47. Weight and mass are the same.
False
48. Reactants form products.
True
Correct answer: B
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Book a Free Consultation49. Matter is lost in reactions.
False
50. Conservation of mass always applies.
True