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Primary 4 Science Materials Quiz
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Questions
TuitionGoWhere Primary School (AI)
Primary 4 Science - Materials Quiz 01
Name: _________________________ Date: _____________
Class: _________________________ Score: ______ / 15
Section A: Multiple Choice Questions (1 mark each)
1. Which of the following describes a physical change?
A) Burning wood
B) Rusting of iron
C) Melting ice
D) Cooking an egg
2. When salt dissolves in water, what is the water called?
A) Solute
B) Solvent
C) Solution
D) Mixture
3. Which process is used to separate sand from water?
A) Evaporation
B) Filtration
C) Distillation
D) Magnetism
4. What happens to the particles of a solid when it is heated?
A) They move faster and spread apart
B) They move slower and come closer
C) They stop moving
D) They disappear
5. Which of the following is a chemical change?
A) Dissolving sugar in water
B) Freezing water into ice
C) Burning paper
D) Cutting wood
Section B: Short Answer Questions (2 marks each)
6. What is the difference between a physical change and a chemical change?
Answer: ___________________________________________________
7. Name two factors that can speed up the dissolving of a solute in a solvent.
Answer: _____________________________________________
8. Describe how you would separate a mixture of salt and sand.
Answer: ___________________________________________________
9. What are the three states of matter? Give one example of each.
Answer: ___________________________________________________
10. Explain what happens to water molecules when water evaporates.
Answer: ___________________________________________________
Section C: Application Questions (2 marks each)
11. Why does salt spread on icy roads help to melt the ice?
Answer: ___________________________________________________
12. A student mixed iron filings and sulfur powder. How can the iron filings be separated from this mixture?
Answer: ___________________________________________________
13. Why is it not possible to reverse the changes that occur when an egg is cooked?
Answer: ___________________________________________________
14. Explain why wet clothes dry faster on a hot, windy day than on a cold, still day.
Answer: ___________________________________________________
15. A solution of salt water is left in an open dish. After a few days, white crystals are found in the dish. Explain what happened.
Answer: ___________________________________________________
End of Quiz
Answers
TuitionGoWhere Primary School (AI)
Primary 4 Science - Materials Quiz 01 - Answer Key
Section A: Multiple Choice Questions (1 mark each)
1. C) Melting ice
Melting is a physical change - no new substance is formed; water can be frozen back to ice.
2. B) Solvent
The solvent is the substance that does the dissolving (water in this case).
3. B) Filtration
Filtration separates insoluble solids (sand) from liquids using a filter.
4. A) They move faster and spread apart
Heat energy causes particles to gain energy, move faster, and spread apart.
5. C) Burning paper
Burning produces new substances (ash, carbon dioxide) and cannot be reversed.
Section B: Short Answer Questions (2 marks each)
6. Physical change: No new substance is formed; the change can usually be reversed (e.g., melting ice).
Chemical change: New substances are formed; the change cannot be easily reversed (e.g., burning wood).
Award 1 mark for each correct explanation.
7. Any two of:
- Stirring
- Heating (increasing temperature)
- Using smaller pieces/crushing the solute
- Using more solvent
Award 1 mark for each correct factor.
8. 1. Add water to the mixture and stir (salt dissolves, sand does not) 2. Filter the mixture (sand stays on filter paper) 3. Evaporate the water to get the salt crystals
Award 2 marks for correct procedure.
9. Three states of matter:
- Solid (e.g., ice, rock, wood)
- Liquid (e.g., water, milk, oil)
- Gas (e.g., air, oxygen, water vapour)
Award 2 marks for all three with examples.
10. When water evaporates, the water molecules gain energy from heat, move faster, and escape from the liquid surface into the air as water vapour.
Award 2 marks for explaining molecules gaining energy and escaping.
Section C: Application Questions (2 marks each)
11. Salt lowers the freezing point of water. When salt is added to ice, it causes the ice to melt at a lower temperature, turning it into liquid water even in cold conditions.
Award 2 marks for explaining lowering of freezing point.
12. Use a magnet to attract and separate the iron filings from the sulfur powder. Iron is magnetic while sulfur is not.
Award 2 marks for correct use of magnetism.
13. Cooking an egg is a chemical change. The proteins in the egg have been permanently changed and new substances have been formed. Chemical changes are not easily reversible.
Award 2 marks for explaining that it's a chemical change and cannot be reversed.
14. On a hot day, water molecules have more energy and evaporate faster. Wind helps by blowing away the water vapour near the clothes, allowing more water to evaporate. On a cold, still day, there is less energy for evaporation and water vapour stays near the clothes.
Award 2 marks for explaining both heat and wind effects on evaporation.
15. The water evaporated into the air, leaving behind the salt that was dissolved in it. The salt formed white crystals as the water slowly evaporated.
Award 2 marks for explaining evaporation leaving salt behind.
Marking Scheme Summary
- Section A: 5 marks (5 questions × 1 mark)
- Section B: 10 marks (5 questions × 2 marks)
- Section C: 10 marks (5 questions × 2 marks)
- Total: 25 marks
End of Answer Key