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Grade 10 Balancing Chemical Equations Worksheet with Answers

Grade 10 (US) · Year 11 (UK) · Class 10 (India) · Chemistry

Unit 3: Chemical ReactionsBalancing EquationsNGSS HS-PS1-7

Using coefficients to balance chemical equations so atoms are conserved. This free high school worksheet has 8 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Balancing Chemical Equations

Grade 10 · Chemistry

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Learning goal: Balancing Equations · NGSS HS-PS1-7

Directions: Read each question carefully and write your answer on the line. Use the diagram to help you.

RememberBalancing equations

2H₂ + O₂ → 2H₂OH: 4 on the leftH: 4 on the right ✓O: 2 on the leftO: 2 on the right ✓Atoms are never made or lost:change the big numbers in front(coefficients), never the small ones.
  1. 1

    Balance the equation: Mg + O₂ → MgO

    MgMg+OOO₂→MgOMgOCount each kind of atom on both sides, then add numbers in front.
  2. 2

    Balance the equation: Na + Cl₂ → NaCl

    NaNa+ClClCl₂→NaClNaClCount each kind of atom on both sides, then add numbers in front.
  3. 3

    Balance the equation: Zn + HCl → ZnCl₂ + H₂

    ZnZn+HClHCl→ZnClClZnCl₂+HHH₂Count each kind of atom on both sides, then add numbers in front.
  4. 4

    Balance the equation: Fe + O₂ → Fe₂O₃

    FeFe+OOO₂→FeFeOOOFe₂O₃Count each kind of atom on both sides, then add numbers in front.
  5. 5

    Balance the equation: CH₄ + O₂ → CO₂ + H₂O

    CHHHHCH₄+OOO₂→COOCO₂+HHOH₂OCount each kind of atom on both sides, then add numbers in front.
  6. 6

    Balance the equation: N₂ + H₂ → NH₃

    NNN₂+HHH₂→NHHHNH₃Count each kind of atom on both sides, then add numbers in front.
  7. 7

    Balance the equation: H₂ + O₂ → H₂O

    HHH₂+OOO₂→HHOH₂OCount each kind of atom on both sides, then add numbers in front.
  8. 8

    Balance the equation: KClO₃ → KCl + O₂

    KClOOOKClO₃→KClKCl+OOO₂Count each kind of atom on both sides, then add numbers in front.

★ Challenge corner for fast finishers

You are in a closed room with a candle, a match and a lamp. What do you light first?

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Free printable worksheets with answer keys · aethelsystems.com/worksheets/chemistry/10/balancing_equations

Answer key (click to show)
  1. 1.2Mg + O₂ → 2MgO
  2. 2.2Na + Cl₂ → 2NaCl
  3. 3.Zn + 2HCl → ZnCl₂ + H₂
  4. 4.4Fe + 3O₂ → 2Fe₂O₃
  5. 5.CH₄ + 2O₂ → CO₂ + 2H₂O
  6. 6.N₂ + 3H₂ → 2NH₃
  7. 7.2H₂ + O₂ → 2H₂O
  8. 8.2KClO₃ → 2KCl + 3O₂
  9. ★the match (challenge corner)

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