Chemical Reactions Review

Name:

Date:

⚗️ Part 1: Balancing Chemical Equations

1. Balance the following chemical equations by writing the correct coefficients:

a) _____ H₂ + _____ O₂ → _____ H₂O

b) _____ Na + _____ Cl₂ → _____ NaCl

c) _____ CaCO₃ → _____ CaO + _____ CO₂

d) _____ CH₄ + _____ O₂ → _____ CO₂ + _____ H₂O

2. For each balanced equation above, identify the type of chemical reaction:

a) H₂ + O₂ → H₂O is a __________________ reaction

b) Na + Cl₂ → NaCl is a __________________ reaction

c) CaCO₃ → CaO + CO₂ is a __________________ reaction

d) CH₄ + O₂ → CO₂ + H₂O is a __________________ reaction

🔬 Part 2: Reaction Types & Analysis

3. Match each reaction type with its correct description:

Synthesis: _____________________

Decomposition: _____________________

Single Replacement: _____________________

Double Replacement: _____________________

Combustion: _____________________

Options: A) One compound breaks down into two or more substances, B) Two compounds exchange ions, C) A substance reacts with oxygen to produce energy, D) Two or more substances combine to form one compound, E) One element replaces another in a compound

4. Look at this equation: Zn + CuSO₄ → ZnSO₄ + Cu

a) What type of reaction is this? _____________________

b) Explain your reasoning for this classification:

5. Circle all the signs that indicate a chemical reaction has occurred:

Colour change

Gas bubbles produced

Temperature change

Precipitate formation

Change in shape only

🌍 Part 3: Real-World Connections

6. Give two examples of chemical reactions that occur in everyday life in New Zealand:

Example 1: _________________________________________________

Example 2: _________________________________________________

7. Choose one of your examples from question 6 and explain why understanding this chemical reaction is important:

8. Reflection: What was the most interesting thing you learned about chemical reactions in this unit? How might this knowledge help you make informed decisions in daily life?