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Chemical Equations Practice Tests

These Grade 10 Science practice tests develop chemical equation notation, reactants, products, coefficients, subscripts, state symbols, atom conservation, charge balance, and equation balancing.

Skills covered

  • Reading reactants, products, arrows, coefficients, subscripts, state symbols, catalysts, and reversible arrows
  • Writing and balancing synthesis, decomposition, replacement, combustion, neutralization, and precipitation equations
  • Counting atoms and charge and applying conservation of matter to chemical equations
  • Using coefficients without changing chemical formulas or substance identities
  • Interpreting word equations, skeleton equations, aqueous notation, polyatomic ions, and reaction conditions

How to use these practice tests

Write the correct formulas first, count each element on both sides, and adjust coefficients only. Finish by checking atoms, charge when relevant, state symbols, and the smallest whole-number ratio.

For more Grade 10 Science practice, return to the Grade 10 Science category.

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Grade 10 Chemical Equations Practice Tests

Practice Grade 10 Science questions about equation parts, reactants, products, coefficients, subscripts, state symbols, balancing atoms and charge, and chemical notation.

Choose the best answer. Read the notation, count atoms and charge, use coefficients to balance, and preserve chemical formulas and reaction identities.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

Which is the balanced equation for hydrogen reacting with oxygen to form water?

Please select an answer first.

Correct answer: A

The correct answer is 2H₂ + O₂ → 2H₂O.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: Both sides contain four hydrogen atoms and two oxygen atoms.
  3. Check the final equation: The correct answer is 2H₂ + O₂ → 2H₂O.

Both sides contain four hydrogen atoms and two oxygen atoms.

2. QuestionMultiple choice

Which is the balanced equation for nitrogen reacting with hydrogen to form ammonia?

Please select an answer first.

Correct answer: B

The correct answer is N₂ + 3H₂ → 2NH₃.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: The balanced equation has two nitrogen atoms and six hydrogen atoms on each side.
  3. Check the final equation: The correct answer is N₂ + 3H₂ → 2NH₃.

The balanced equation has two nitrogen atoms and six hydrogen atoms on each side.

3. QuestionMultiple choice

Which is the balanced equation for iron reacting with oxygen to form iron(III) oxide?

Please select an answer first.

Correct answer: C

The correct answer is 4Fe + 3O₂ → 2Fe₂O₃.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: Four iron atoms and six oxygen atoms appear on each side of the balanced equation.
  3. Check the final equation: The correct answer is 4Fe + 3O₂ → 2Fe₂O₃.

Four iron atoms and six oxygen atoms appear on each side of the balanced equation.

4. QuestionMultiple choice

Which is the balanced equation for aluminum reacting with oxygen to form aluminum oxide?

Please select an answer first.

Correct answer: D

The correct answer is 4Al + 3O₂ → 2Al₂O₃.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: The equation has four aluminum atoms and six oxygen atoms on both sides.
  3. Check the final equation: The correct answer is 4Al + 3O₂ → 2Al₂O₃.

The equation has four aluminum atoms and six oxygen atoms on both sides.

5. QuestionMultiple choice

Which is the balanced equation for sodium reacting with chlorine?

Please select an answer first.

Correct answer: A

The correct answer is 2Na + Cl₂ → 2NaCl.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: Two sodium atoms and two chlorine atoms are present on both sides.
  3. Check the final equation: The correct answer is 2Na + Cl₂ → 2NaCl.

Two sodium atoms and two chlorine atoms are present on both sides.

6. QuestionMultiple choice

Which is the balanced equation for magnesium reacting with oxygen?

Please select an answer first.

Correct answer: B

The correct answer is 2Mg + O₂ → 2MgO.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: The coefficient 2 is needed for magnesium and oxygen atom counts to match.
  3. Check the final equation: The correct answer is 2Mg + O₂ → 2MgO.

The coefficient 2 is needed for magnesium and oxygen atom counts to match.

7. QuestionMultiple choice

Which is the balanced equation for potassium chlorate decomposition?

Please select an answer first.

Correct answer: C

The correct answer is 2KClO₃ → 2KCl + 3O₂.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: Two potassium, two chlorine, and six oxygen atoms occur on each side.
  3. Check the final equation: The correct answer is 2KClO₃ → 2KCl + 3O₂.

Two potassium, two chlorine, and six oxygen atoms occur on each side.

8. QuestionMultiple choice

Which equation is already balanced for calcium carbonate decomposition?

Please select an answer first.

Correct answer: D

The correct answer is CaCO₃ → CaO + CO₂.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: One calcium, one carbon, and three oxygen atoms appear on both sides.
  3. Check the final equation: The correct answer is CaCO₃ → CaO + CO₂.

One calcium, one carbon, and three oxygen atoms appear on both sides.

9. QuestionMultiple choice

Which is the balanced equation for methane combustion?

Please select an answer first.

Correct answer: A

The correct answer is CH₄ + 2O₂ → CO₂ + 2H₂O.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: One carbon, four hydrogen, and four oxygen atoms occur on each side.
  3. Check the final equation: The correct answer is CH₄ + 2O₂ → CO₂ + 2H₂O.

One carbon, four hydrogen, and four oxygen atoms occur on each side.

10. QuestionMultiple choice

Which is the balanced equation for propane combustion?

Please select an answer first.

Correct answer: B

The correct answer is C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: The equation contains three carbon, eight hydrogen, and ten oxygen atoms on each side.
  3. Check the final equation: The correct answer is C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.

The equation contains three carbon, eight hydrogen, and ten oxygen atoms on each side.

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