Science>Year 10>Unit 2>Unit Quiz

Unit Quiz

This comprehensive quiz covers all 20 lessons of the Chemical Reactions unit. It tests your ability to recall, apply, analyse and evaluate concepts from chemical changes to industrial processes.

SC5-RXN-01 · SC5-RXN-02All Lessons15 MC5 Short Answer
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What This Quiz Covers

This is your final assessment for the unit. Questions draw from all four blocks and require both factual recall and conceptual understanding.

MC Score
0 / 15
SA Score
0 / 20
Multiple Choice
Q

Test Your Understanding

UnderstandBand 3

1. Which of the following is a chemical change?

ASugar dissolving in water
BIron rusting
CWater boiling
DGlass breaking
UnderstandBand 3

2. Which pH value is strongly alkaline?

ApH 3
BpH 6
CpH 12
DpH 7
UnderstandBand 3

3. What type of reaction is: acid + base -> salt + water?

ANeutralisation
BCombustion
CDecomposition
DSynthesis
ApplyBand 4

4. Which metal will NOT displace copper from copper sulfate solution?

AZinc
BMagnesium
CIron
DSilver
UnderstandBand 3

5. Which of the following is a product of incomplete combustion?

ACarbon dioxide only
BCarbon monoxide and soot
CWater vapour only
DOxygen gas
UnderstandBand 4

6. In a balanced equation, what must be equal on both sides?

AThe number of molecules
BThe total mass of reactants and products
CThe number of atoms of each element
DThe volume of gases
UnderstandBand 3

7. Which reaction is endothermic?

APhotosynthesis
BBurning wood
CNeutralisation of an acid
DRusting iron
UnderstandBand 3

8. Which factor does NOT increase the rate of a chemical reaction?

AIncreasing temperature
BAdding a catalyst
CIncreasing surface area
DDecreasing concentration
UnderstandBand 4

9. What is the role of a catalyst in a chemical reaction?

AIt increases the temperature of the reaction
BIt provides an alternative reaction pathway and is not used up
CIt increases the concentration of reactants
DIt changes the products of the reaction
ApplyBand 4

10. A student investigates how surface area affects reaction rate using marble chips and acid. What is the dependent variable?

AThe size of the marble chips
BThe concentration of the acid
CThe time taken for the reaction to complete
DThe temperature of the room
UnderstandBand 3

11. What is the main purpose of the Haber process?

ATo produce ammonia for fertilisers
BTo separate crude oil into fractions
CTo produce sulfuric acid
DTo extract iron from its ore
UnderstandBand 4

12. Why is ocean acidification a concern for marine life?

AIt makes the water too warm for fish
BIt reduces the salt content of seawater
CIt increases the oxygen levels too much
DIt makes it harder for shell-forming organisms to build calcium carbonate structures
UnderstandBand 3

13. Which process demonstrates a decomposition reaction?

AHydrogen and oxygen combining to form water
BCalcium carbonate breaking down into calcium oxide and carbon dioxide when heated
CSodium and chlorine combining to form sodium chloride
DZinc displacing copper from copper sulfate
AnalyseBand 4

14. A reaction produces heat, light and a new white solid. The solid cannot be turned back into the original substances. Which conclusion is correct?

AIt is a physical change because heat is produced
BIt is endothermic because light is produced
CIt is an exothermic chemical reaction with new substances formed
DIt is a reversible physical change
AnalyseBand 5

15. Which statement best explains why understanding reaction rates is important in both biology and industry?

ABoth rely on controlling how fast reactions occur — enzymes control digestion in biology, while temperature and pressure control ammonia production in industry
BOnly industry needs to control reaction rates; biology happens naturally
CBiological reactions are always faster than industrial reactions
DIndustrial reactions are always exothermic while biological reactions are endothermic
Short Answer
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Short Answer Questions

UnderstandBand 3

16. Describe the difference between a physical change and a chemical change. Give two examples of each and explain why they fit each category. 4 MARKS

Answer in your book.
ApplyBand 4

17. Compare complete and incomplete combustion. Include the reactants, products, and one environmental consequence of each. 4 MARKS

Write a comparison in your book.
ApplyBand 4

18. Explain how three different factors (concentration, temperature and surface area) affect reaction rate. Use collision theory in your answer. 4 MARKS

Use collision theory in your book.
AnalyseBand 5

19. Evaluate the claim: "Chemical reactions are always harmful to the environment." In your answer, provide at least one supporting argument and one counter-argument, using specific examples from this unit. 4 MARKS

Write a balanced evaluation in your book.
AnalyseBand 5

20. Synthesise your understanding of the entire unit by explaining how chemical changes, reaction types, rate factors and evidence are all connected in the study of chemistry. 4 MARKS

Write a synthesis in your book.

Quiz Complete!

Well done on completing the full unit quiz. Use your results to identify areas for revision before moving on.

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