Types of chemical reaction Quiz
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5 questions, one answer each
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1. Zinc is added to blue copper sulfate solution. The blue colour fades and a pink-brown solid forms. What type of reaction is this?
- A. Decomposition
- B. Synthesis
- C. Displacement
- D. Neutralisation
2. Which of these is an exothermic reaction?
- A. Burning methane in oxygen
- B. Heating copper carbonate until it breaks down
- C. Boiling water
- D. Dissolving sugar in water
3. In the reaction 2Mg + O₂ → 2MgO, what happens to the magnesium?
- A. It is reduced
- B. It is neutralised
- C. It is decomposed
- D. It is oxidised
4. What is a precipitate?
- A. A gas given off in a reaction
- B. An insoluble solid formed when two solutions react
- C. A liquid formed when an acid is neutralised
- D. A solid that dissolves quickly in water
5. Which change is a chemical change?
- A. Ice melting
- B. Sugar dissolving in water
- C. Iron rusting
- D. Water boiling