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Chemical Reactions Practice Tests

These Grade 10 Science practice tests develop evidence of chemical change, reactants, products, reaction types, balanced equations, conservation of atoms, catalysts, energy changes, and reaction rates.

Skills covered

  • Identifying precipitates, gas formation, temperature changes, color changes, and other evidence of chemical reactions
  • Distinguishing reactants and products and applying conservation of matter to chemical equations
  • Classifying synthesis, decomposition, single replacement, double replacement, combustion, neutralization, and redox reactions
  • Balancing equations with coefficients while preserving chemical formulas and state symbols
  • Explaining exothermic and endothermic reactions, activation energy, catalysts, collision theory, concentration, temperature, and surface area

How to use these practice tests

Read the equation from left to right, count each type of atom, and classify the pattern. When analyzing rate or energy, connect the observation to particle collisions and activation energy.

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

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Grade 10 Chemical Reactions Practice Tests

Practice Grade 10 Science questions about evidence of chemical change, reactants, products, reaction types, balancing equations, conservation of atoms, catalysts, energy, and reaction rates.

Choose the best answer. Identify reactants and products, classify the reaction, balance atoms with coefficients, and analyze energy or rate changes.

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

What do coefficients in a balanced equation change?

Please select an answer first.

Correct answer: A

The correct answer is The amounts or ratios of substances without changing their chemical identities.

  1. Identify the reaction concept: Determine whether the question asks about evidence, reactants, products, reaction type, balancing, energy, or reaction rate.
  2. Track the chemical change: Coefficients multiply whole formulas while subscripts remain part of the substance identity.
  3. Check atoms and energy: The correct answer is The amounts or ratios of substances without changing their chemical identities.

Coefficients multiply whole formulas while subscripts remain part of the substance identity.

2. QuestionMultiple choice

Which equation is balanced for forming water?

Please select an answer first.

Correct answer: B

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

  1. Identify the reaction concept: Determine whether the question asks about evidence, reactants, products, reaction type, balancing, energy, or reaction rate.
  2. Track the chemical change: Both sides contain four hydrogen atoms and two oxygen atoms.
  3. Check atoms and energy: The correct answer is 2H₂ + O₂ → 2H₂O.

Both sides contain four hydrogen atoms and two oxygen atoms.

3. QuestionMultiple choice

Which equation is balanced for forming ammonia?

Please select an answer first.

Correct answer: C

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

  1. Identify the reaction concept: Determine whether the question asks about evidence, reactants, products, reaction type, balancing, energy, or reaction rate.
  2. Track the chemical change: The balanced equation has two nitrogen atoms and six hydrogen atoms on each side.
  3. Check atoms and energy: The correct answer is N₂ + 3H₂ → 2NH₃.

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

4. QuestionMultiple choice

Why should subscripts not be changed when balancing an equation?

Please select an answer first.

Correct answer: D

The correct answer is Changing a subscript changes the identity of the substance..

  1. Identify the reaction concept: Determine whether the question asks about evidence, reactants, products, reaction type, balancing, energy, or reaction rate.
  2. Track the chemical change: Only coefficients can be changed without converting the reactant or product into a different substance.
  3. Check atoms and energy: The correct answer is Changing a subscript changes the identity of the substance..

Only coefficients can be changed without converting the reactant or product into a different substance.

5. QuestionMultiple choice

How many oxygen atoms are represented by 3O₂?

Please select an answer first.

Correct answer: A

The correct answer is 6.

  1. Identify the reaction concept: Determine whether the question asks about evidence, reactants, products, reaction type, balancing, energy, or reaction rate.
  2. Track the chemical change: The coefficient 3 multiplies the subscript 2, giving 3 × 2 = 6 oxygen atoms.
  3. Check atoms and energy: The correct answer is 6.

The coefficient 3 multiplies the subscript 2, giving 3 × 2 = 6 oxygen atoms.

6. QuestionMultiple choice

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

Please select an answer first.

Correct answer: B

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

  1. Identify the reaction concept: Determine whether the question asks about evidence, reactants, products, reaction type, balancing, energy, or reaction rate.
  2. Track the chemical change: The equation has four iron atoms and six oxygen atoms on each side.
  3. Check atoms and energy: The correct answer is 4Fe + 3O₂ → 2Fe₂O₃.

The equation has four iron atoms and six oxygen atoms on each side.

7. QuestionMultiple choice

What can state symbols in a chemical equation show?

Please select an answer first.

Correct answer: C

The correct answer is Whether a substance is solid, liquid, aqueous, or gas.

  1. Identify the reaction concept: Determine whether the question asks about evidence, reactants, products, reaction type, balancing, energy, or reaction rate.
  2. Track the chemical change: State symbols such as (s), (l), (aq), and (g) describe the physical state of each substance.
  3. Check atoms and energy: The correct answer is Whether a substance is solid, liquid, aqueous, or gas.

State symbols such as (s), (l), (aq), and (g) describe the physical state of each substance.

8. QuestionMultiple choice

What does a balanced chemical equation demonstrate?

Please select an answer first.

Correct answer: D

The correct answer is Conservation of each type of atom in the reaction.

  1. Identify the reaction concept: Determine whether the question asks about evidence, reactants, products, reaction type, balancing, energy, or reaction rate.
  2. Track the chemical change: Balanced coefficients make the number of each element equal on both sides.
  3. Check atoms and energy: The correct answer is Conservation of each type of atom in the reaction.

Balanced coefficients make the number of each element equal on both sides.

9. QuestionMultiple choice

What does multiplying every coefficient in an equation by 2 do?

Please select an answer first.

Correct answer: A

The correct answer is It doubles the amount of every substance while preserving the same ratio..

  1. Identify the reaction concept: Determine whether the question asks about evidence, reactants, products, reaction type, balancing, energy, or reaction rate.
  2. Track the chemical change: Multiplying all coefficients changes the scale of the reaction but not its stoichiometric ratio.
  3. Check atoms and energy: The correct answer is It doubles the amount of every substance while preserving the same ratio..

Multiplying all coefficients changes the scale of the reaction but not its stoichiometric ratio.

10. QuestionMultiple choice

What is an unbalanced equation?

Please select an answer first.

Correct answer: B

The correct answer is An equation in which at least one element has different atom counts on the two sides.

  1. Identify the reaction concept: Determine whether the question asks about evidence, reactants, products, reaction type, balancing, energy, or reaction rate.
  2. Track the chemical change: An unbalanced equation does not yet satisfy conservation of atoms.
  3. Check atoms and energy: The correct answer is An equation in which at least one element has different atom counts on the two sides.

An unbalanced equation does not yet satisfy conservation of atoms.

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