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Year 8 Chemistry End of Year Test
Instructions:
- Answer all questions.
- Show working where necessary.
- Write clearly and neatly.
Section A – Multiple Choice (1 mark each)
1. Which state of matter has a fixed shape?
1 mark
A) Liquid B) Gas C) Solid D) Plasma
A) Liquid B) Gas C) Solid D) Plasma
2. Which particle is negatively charged?
1 mark
A) Proton B) Neutron C) Electron D) Nucleus
A) Proton B) Neutron C) Electron D) Nucleus
3. Which process is a physical change?
1 mark
A) Burning B) Rusting C) Melting D) Neutralisation
A) Burning B) Rusting C) Melting D) Neutralisation
4. Which gas turns limewater milky?
1 mark
A) Oxygen B) Carbon dioxide C) Hydrogen D) Nitrogen
A) Oxygen B) Carbon dioxide C) Hydrogen D) Nitrogen
5. pH 2 is:
1 mark
A) Neutral B) Acidic C) Alkaline D) Salt
A) Neutral B) Acidic C) Alkaline D) Salt
6. Which element is a metal?
1 mark
A) Oxygen B) Sulfur C) Copper D) Carbon
A) Oxygen B) Sulfur C) Copper D) Carbon
7. Thermal decomposition requires:
1 mark
A) Light B) Heat C) Electricity D) Water
A) Light B) Heat C) Electricity D) Water
8. Which is a compound?
1 mark
A) Air B) Oxygen C) Water D) Iron
A) Air B) Oxygen C) Water D) Iron
9. Which method separates sand from water?
1 mark
A) Filtration B) Distillation C) Chromatography D) Evaporation
A) Filtration B) Distillation C) Chromatography D) Evaporation
10. Which is an exothermic reaction?
1 mark
A) Photosynthesis B) Combustion C) Melting D) Boiling
A) Photosynthesis B) Combustion C) Melting D) Boiling
Section B – Short Answer Questions
11. Define an element.
2 marks
12. State two properties of gases.
2 marks
13. Write the word equation for combustion of magnesium.
2 marks
14. What is neutralisation?
2 marks
15. What is the pH of a neutral solution?
1 mark
16. Name two methods of separating mixtures.
2 marks
17. What is meant by conservation of mass?
2 marks
18. Describe what happens to particles during melting.
2 marks
19. What is a chemical reaction?
2 marks
20. State one use of carbon dioxide.
1 mark
Section C – Longer & Application Questions
21. Draw and label the structure of an atom (describe in words).
3 marks
22. Explain the difference between a physical and chemical change.
2 marks
23. Describe the test for hydrogen gas.
2 marks
24. Explain what happens in thermal decomposition of calcium carbonate.
2 marks
25. A student heats copper carbonate. Describe the observations.
2 marks
26. Calculate the mass of solution if 5g salt is dissolved in 95g water.
2 marks
27. Explain why combustion is exothermic.
2 marks
28. Describe the particle arrangement in solids, liquids and gases.
3 marks
29. Explain the difference between acids and alkalis.
2 marks
30. Give one environmental impact of burning fossil fuels.
1 mark
Mark Scheme / Answers
Section A:1. C | 2. C | 3. C | 4. B | 5. B | 6. C | 7. B | 8. C | 9. A | 10. B
Section B:
11. A substance made of one type of atom.
12. Move freely; no fixed shape; compressible (any two).
13. Magnesium + Oxygen → Magnesium oxide
14. Reaction between acid and alkali forming salt and water.
15. 7
16. Filtration, distillation, evaporation, chromatography (any two).
17. Mass is neither created nor destroyed in a reaction.
18. Particles gain energy and move further apart.
19. A process where new substances are formed.
20. Fire extinguishers / fizzy drinks / photosynthesis (any one).
Section C:
21. Nucleus containing protons and neutrons; electrons orbiting.
22. Physical: no new substance; Chemical: new substance formed.
23. Squeaky pop test with a lit splint.
24. CaCO₃ → CaO + CO₂ when heated.
25. Green solid turns black; CO₂ released.
26. 100g
27. Energy is released to surroundings.
28. Solid: tightly packed; Liquid: close but move; Gas: far apart.
29. Acids have pH <7; Alkalis have pH >7.
30. Global warming / air pollution / acid rain (any one).