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Balancing chemical equations

9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.MS-PS1-5, NGSS.HS-PS1-7 · England: KS4 Combined Science: Chemical changes

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Date

Score/ 16

  1. Question 1

    CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂ How many H atoms are on the right side of this balanced equation?

    Answer

  2. Question 2

    Balance the equation. What number goes in the gap? CH₄ + __O₂ → CO₂ + 2H₂O

    Answer

  3. Question 3

    Which equation is correctly balanced?

    • A. N₂ + 3H₂ → NH₃
    • B. 2N₂ + 3H₂ → 2NH₃
    • C. N₂ + 2H₂ → 2NH₃
    • D. N₂ + 3H₂ → 2NH₃

  4. Question 4

    2Al + 3Cl₂ → 2AlCl₃ How many Cl atoms are on the left side of this balanced equation?

    Answer

  5. Question 5

    Balance the equation. What number goes in the gap? __H₂O₂ → 2H₂O + O₂

    Answer

  6. Question 6

    Which equation is correctly balanced?

    • A. 2Na + 2Cl₂ → 2NaCl
    • B. 2Na + Cl₂ → NaCl
    • C. Na + Cl₂ → 2NaCl
    • D. 2Na + Cl₂ → 2NaCl

  7. Question 7

    2Mg + O₂ → 2MgO How many Mg atoms are on the right side of this balanced equation?

    Answer

  8. Question 8

    Balance the equation. What number goes in the gap? 2H₂ + O₂ → __H₂O

    Answer

  9. Question 9

    Which equation is correctly balanced?

    • A. CH₄ + 2O₂ → CO₂ + 2H₂O
    • B. CH₄ + 2O₂ → 2CO₂ + 2H₂O
    • C. 2CH₄ + 2O₂ → CO₂ + 2H₂O
    • D. CH₄ + 3O₂ → CO₂ + 2H₂O

  10. Question 10

    CH₄ + 2O₂ → CO₂ + 2H₂O How many C atoms are on the left side of this balanced equation?

    Answer

  11. Question 11

    Balance the equation. What number goes in the gap? 2Na + Cl₂ → __NaCl

    Answer

  12. Question 12

    Which equation is correctly balanced?

    • A. 2C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
    • B. C₃H₈ + 5O₂ → 4CO₂ + 4H₂O
    • C. C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
    • D. C₃H₈ + 5O₂ → 3CO₂ + 3H₂O

  13. Question 13

    2Na + Cl₂ → 2NaCl How many Na atoms are on the left side of this balanced equation?

    Answer

  14. Question 14

    Balance the equation. What number goes in the gap? CH₄ + __O₂ → CO₂ + 2H₂O

    Answer

  15. Question 15

    Which equation is correctly balanced?

    • A. CH₄ + 2O₂ → CO₂ + H₂O
    • B. 2CH₄ + 2O₂ → CO₂ + 2H₂O
    • C. CH₄ + 2O₂ → CO₂ + 2H₂O
    • D. CH₄ + O₂ → CO₂ + 2H₂O

  16. Question 16

    4Fe + 3O₂ → 2Fe₂O₃ How many O atoms are on the right side of this balanced equation?

    Answer

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Answer key: Balancing chemical equations

  1. 1. 2

  2. 2. 2

  3. 3. D. N₂ + 3H₂ → 2NH₃

  4. 4. 6

  5. 5. 2

  6. 6. D. 2Na + Cl₂ → 2NaCl

  7. 7. 2

  8. 8. 2

  9. 9. A. CH₄ + 2O₂ → CO₂ + 2H₂O

  10. 10. 1

  11. 11. 2

  12. 12. C. C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

  13. 13. 2

  14. 14. 2

  15. 15. C. CH₄ + 2O₂ → CO₂ + 2H₂O

  16. 16. 6