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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 equation is balanced for potassium reacting with water?

Please select an answer first.

Correct answer: A

The correct answer is 2K + 2H₂O → 2KOH + H₂.

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

Two potassium and four hydrogen atoms and two oxygen atoms appear on both sides.

2. QuestionMultiple choice

Which equation is balanced for hydrogen chloride reacting with sodium hydroxide?

Please select an answer first.

Correct answer: B

The correct answer is HCl + NaOH → NaCl + H₂O.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: One formula unit of each reactant produces one sodium chloride and one water molecule.
  3. Check the final equation: The correct answer is HCl + NaOH → NaCl + H₂O.

One formula unit of each reactant produces one sodium chloride and one water molecule.

3. QuestionMultiple choice

Which coefficient set balances C₃H₈ + O₂ → CO₂ + H₂O?

Please select an answer first.

Correct answer: C

The correct answer is 1, 5, 3, 4.

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

Three carbon atoms require 3CO₂, eight hydrogen atoms require 4H₂O, and ten oxygen atoms require 5O₂.

4. QuestionMultiple choice

Which equation is balanced for the formation of calcium oxide from calcium and oxygen?

Please select an answer first.

Correct answer: D

The correct answer is 2Ca + O₂ → 2CaO.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: Two calcium atoms and two oxygen atoms occur on both sides.
  3. Check the final equation: The correct answer is 2Ca + O₂ → 2CaO.

Two calcium atoms and two oxygen atoms occur on both sides.

5. QuestionMultiple choice

Which equation is balanced for the decomposition of sodium bicarbonate?

Please select an answer first.

Correct answer: A

The correct answer is 2NaHCO₃ → Na₂CO₃ + H₂O + CO₂.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: Two sodium, two hydrogen, two carbon, and six oxygen atoms are conserved.
  3. Check the final equation: The correct answer is 2NaHCO₃ → Na₂CO₃ + H₂O + CO₂.

Two sodium, two hydrogen, two carbon, and six oxygen atoms are conserved.

6. QuestionMultiple choice

Which equation is balanced for chlorine reacting with potassium bromide?

Please select an answer first.

Correct answer: B

The correct answer is Cl₂ + 2KBr → 2KCl + Br₂.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: Two chlorine, two potassium, and two bromine atoms appear on both sides.
  3. Check the final equation: The correct answer is Cl₂ + 2KBr → 2KCl + Br₂.

Two chlorine, two potassium, and two bromine atoms appear on both sides.

7. QuestionMultiple choice

Which equation is balanced for methane reacting with chlorine in a single-replacement style substitution?

Please select an answer first.

Correct answer: C

The correct answer is CH₄ + Cl₂ → CH₃Cl + HCl.

  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, two chlorine atoms occur on each side of the substitution equation.
  3. Check the final equation: The correct answer is CH₄ + Cl₂ → CH₃Cl + HCl.

One carbon, four hydrogen, two chlorine atoms occur on each side of the substitution equation.

8. QuestionMultiple choice

Which equation is balanced for sulfur dioxide oxidizing to sulfur trioxide?

Please select an answer first.

Correct answer: D

The correct answer is 2SO₂ + O₂ → 2SO₃.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: Two sulfur and six oxygen atoms occur on both sides.
  3. Check the final equation: The correct answer is 2SO₂ + O₂ → 2SO₃.

Two sulfur and six oxygen atoms occur on both sides.

9. QuestionMultiple choice

Which equation is balanced for copper reacting with oxygen to form copper(II) oxide?

Please select an answer first.

Correct answer: A

The correct answer is 2Cu + O₂ → 2CuO.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: Two copper atoms and two oxygen atoms are present on each side.
  3. Check the final equation: The correct answer is 2Cu + O₂ → 2CuO.

Two copper atoms and two oxygen atoms are present on each side.

10. QuestionMultiple choice

Which equation is balanced for the formation of hydrogen chloride?

Please select an answer first.

Correct answer: B

The correct answer is H₂ + Cl₂ → 2HCl.

  1. Read the equation notation: Identify reactants, products, coefficients, subscripts, state symbols, arrows, and any reaction conditions.
  2. Count atoms or charge: Two hydrogen and two chlorine atoms occur on both sides.
  3. Check the final equation: The correct answer is H₂ + Cl₂ → 2HCl.

Two hydrogen and two chlorine atoms occur on both sides.

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