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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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  1. Question 1

    Which equation is correctly balanced?

    • A. Zn + 2HCl → ZnCl₂ + H₂
    • B. 2Zn + 2HCl → ZnCl₂ + H₂
    • C. Zn + HCl → ZnCl₂ + H₂
    • D. Zn + 2HCl → 2ZnCl₂ + H₂

  2. Question 2

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

    Answer

  3. Question 3

    Balance the equation. What number goes in the gap? C₃H₈ + __O₂ → 3CO₂ + 4H₂O

    Answer

  4. Question 4

    Which equation is correctly balanced?

    • A. C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
    • B. 2C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
    • C. C₃H₈ + 6O₂ → 3CO₂ + 4H₂O
    • D. C₃H₈ + 5O₂ → 2CO₂ + 4H₂O

  5. Question 5

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

    Answer

  6. Question 6

    Balance the equation. What number goes in the gap? 4Fe + 3O₂ → __Fe₂O₃

    Answer

  7. Question 7

    Which equation is correctly balanced?

    • A. C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
    • B. C₃H₈ + 5O₂ → 3CO₂ + 5H₂O
    • C. C₃H₈ + 6O₂ → 3CO₂ + 4H₂O
    • D. 2C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

  8. Question 8

    N₂ + 3H₂ → 2NH₃ How many N atoms are on the right side of this balanced equation?

    Answer

  9. Question 9

    Balance the equation. What number goes in the gap? C₃H₈ + 5O₂ → __CO₂ + 4H₂O

    Answer

  10. Question 10

    Which equation is correctly balanced?

    • A. 2Mg + O₂ → MgO
    • B. 2Mg + 2O₂ → 2MgO
    • C. 3Mg + O₂ → 2MgO
    • D. 2Mg + O₂ → 2MgO

  11. Question 11

    N₂ + 3H₂ → 2NH₃ How many H atoms are on the right side of this balanced equation?

    Answer

  12. Question 12

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

    Answer

  13. Question 13

    Which equation is correctly balanced?

    • A. 2H₂O₂ → H₂O + O₂
    • B. 2H₂O₂ → 2H₂O + 2O₂
    • C. H₂O₂ → 2H₂O + O₂
    • D. 2H₂O₂ → 2H₂O + O₂

  14. Question 14

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

    Answer

  15. Question 15

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

    Answer

  16. Question 16

    Which equation is correctly balanced?

    • A. 2K + 2H₂O → 2KOH + 2H₂
    • B. 2K + 2H₂O → 2KOH + H₂
    • C. 2K + 3H₂O → 2KOH + H₂
    • D. 2K + 2H₂O → 3KOH + H₂

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  1. Zn + 2HCl → ZnCl₂ + H₂
  2. 2
  3. 5
  4. C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
  5. 6
  6. 2
  7. C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
  8. 2
  9. 3
  10. 2Mg + O₂ → 2MgO
  11. 6
  12. 2
  13. 2H₂O₂ → 2H₂O + O₂
  14. 2
  15. 2
  16. 2K + 2H₂O → 2KOH + H₂