Name: ___________________________ ( ) Class:_______ Date: ________

Let’s practice balancing chemical equations first before writing the full balanced chemical equations.

1. H2 + O2 → H2O

2. Mg + O2 → MgO

3. HgO → Hg + O2

4. Zn + HCl → ZnCl2 + H2

5. Na + H2O → NaOH + H2

6. C10H16 + Cl2 → C + HCl

7. Fe + O2 → Fe2O3

8. SiO2 + HF → SiF4 + H2O

9. Sb + O2 → Sb4O6

10. N2 + H2 → NH3

11. Fe2O3 + H2 → Fe + H2O

12. K + Br2 → KBr

13. H2O2 → H2O + O2

14. C2H2 + O2 → CO2 + H2O

15. C7H16 + O2 → CO2 + H2O

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Secondary 3 NA Science (Chemistry)Chapter 7: Writing EquationsWorksheet 1

Write out a balanced equation with state symbols from the following reactions. The first example has been done for you.

1. SO2 (gas) + O2 (gas) SO3 (gas)Example: SO2 (g) + 2 O 2 (g) 2 SO 3 (g)

2. Ca (solid) + O2 (gas) CaO (gas)

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3. C2H4 (gas) + O2 (gas) CO2 (gas) + H2O (gas)

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4. Fe2O3 (solid) + CO (gas) Fe (liquid) + CO2 (gas)

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5. Mg (solid) + HNO3 (solution) Mg(NO3)2 (solution) + H2 (gas)

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6. H2SO4(solution) + NaOH (solution) Na2SO4 (solution) + H2O (liquid)

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7. Al (solid) + HCl (solution) AlCl3 (solution) + H2 (gas)

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8. HCl (solution) +Na2CO3 (solution) NaCl (solution) + H2O (liquid) + CO2 (gas)

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9. Pb(NO3)2 (solution) + 2KI (solution) PbI2 (solid) + 2KNO3 (solution)

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10. CO2 (gas) + H2O (liquid) → C6H12O6 (solid) + O2 (gas)

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Prepared by Lin XJ 3