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Balancing Chemical Equations Activity
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Balancing Chemical Equations Activity
📚 Part 1: Multiple Choice (Use counters to support your thinking)
1. Which balanced equation correctly represents the reaction between hydrogen and oxygen to make water?
H2 + O2 → H2O
2H2 + O2 → 2H2O
H2 + 2O2 → H2O2
2. What do whole-number coefficients in a balanced chemical equation represent?
The actual mass in grams of each substance
The relative number of molecules (or formula units) involved
The temperature (°C) needed for the reaction
3. Which set of coefficients balances: N2 + H2 → NH3 ?
1 N2 + 1 H2 → 1 NH3
1 N2 + 3 H2 → 2 NH3
2 N2 + 3 H2 → 2 NH3
4. Choose the correct balanced form of: Fe + Cl2 → FeCl3
Fe + Cl2 → FeCl3
2Fe + 3Cl2 → 2FeCl3
2Fe + Cl2 → FeCl3
✏️ Part 2: Short Answers & Practical Tasks
5. Balance the equation below by writing whole-number coefficients in the blanks. Then, sketch (or imagine) counters to show each atom is conserved.
__ H2 + __ O2 → __ H2O
6. Balance this synthesis reaction (use counters if needed):
__ N2 + __ H2 → __ NH3
7. Balance this reaction (show coefficients):
__ Fe + __ Cl2 → __ FeCl3
8. Practical reflection: In one or two sentences, explain how using coloured counters helps you understand the Law of Conservation of Mass when balancing equations.
9. Exit ticket — final check (teacher collects): Balance and briefly explain why the equation must be balanced.
__ Mg + __ O2 → __ MgO
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