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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 is an exothermic reaction?

Please select an answer first.

Correct answer: A

The correct answer is A reaction that releases net energy to the surroundings.

  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: Exothermic reactions release energy, often as heat or light.
  3. Check atoms and energy: The correct answer is A reaction that releases net energy to the surroundings.

Exothermic reactions release energy, often as heat or light.

2. QuestionMultiple choice

What is an endothermic reaction?

Please select an answer first.

Correct answer: B

The correct answer is A reaction that absorbs net energy from the surroundings.

  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: Endothermic reactions require a net input of energy.
  3. Check atoms and energy: The correct answer is A reaction that absorbs net energy from the surroundings.

Endothermic reactions require a net input of energy.

3. QuestionMultiple choice

What is activation energy?

Please select an answer first.

Correct answer: C

The correct answer is The minimum energy needed for particles to begin a chemical 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: Reacting particles must reach an activation-energy threshold for effective collisions.
  3. Check atoms and energy: The correct answer is The minimum energy needed for particles to begin a chemical reaction.

Reacting particles must reach an activation-energy threshold for effective collisions.

4. QuestionMultiple choice

How does a catalyst affect activation energy?

Please select an answer first.

Correct answer: D

The correct answer is It lowers the activation energy by providing an alternative reaction pathway..

  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: A catalyst makes effective collisions easier without changing the overall reactant and product identities.
  3. Check atoms and energy: The correct answer is It lowers the activation energy by providing an alternative reaction pathway..

A catalyst makes effective collisions easier without changing the overall reactant and product identities.

5. QuestionMultiple choice

What does collision theory say about chemical reactions?

Please select an answer first.

Correct answer: A

The correct answer is Particles must collide with enough energy and suitable orientation to react..

  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: Successful collisions require both sufficient energy and an orientation that allows bonds to change.
  3. Check atoms and energy: The correct answer is Particles must collide with enough energy and suitable orientation to react..

Successful collisions require both sufficient energy and an orientation that allows bonds to change.

6. QuestionMultiple choice

Why does increasing temperature often increase reaction rate?

Please select an answer first.

Correct answer: B

The correct answer is Particles move faster and a greater fraction of collisions can exceed activation energy..

  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: Higher temperature increases kinetic energy and the number of effective collisions.
  3. Check atoms and energy: The correct answer is Particles move faster and a greater fraction of collisions can exceed activation energy..

Higher temperature increases kinetic energy and the number of effective collisions.

7. QuestionMultiple choice

Why can increasing concentration increase reaction rate?

Please select an answer first.

Correct answer: C

The correct answer is More reactant particles in a given volume produce more frequent collisions..

  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: Higher concentration increases collision frequency when other conditions are controlled.
  3. Check atoms and energy: The correct answer is More reactant particles in a given volume produce more frequent collisions..

Higher concentration increases collision frequency when other conditions are controlled.

8. QuestionMultiple choice

Why does a powdered solid often react faster than a large lump of the same solid?

Please select an answer first.

Correct answer: D

The correct answer is Powder has more exposed surface area for collisions..

  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: Greater surface area exposes more particles to the other reactant.
  3. Check atoms and energy: The correct answer is Powder has more exposed surface area for collisions..

Greater surface area exposes more particles to the other reactant.

9. QuestionMultiple choice

What is an inhibitor?

Please select an answer first.

Correct answer: A

The correct answer is A substance that slows a reaction or reduces the rate of 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: Inhibitors reduce reaction rate by interfering with effective collisions or reaction pathways.
  3. Check atoms and energy: The correct answer is A substance that slows a reaction or reduces the rate of reaction.

Inhibitors reduce reaction rate by interfering with effective collisions or reaction pathways.

10. QuestionMultiple choice

What does the peak of an energy profile usually represent?

Please select an answer first.

Correct answer: B

The correct answer is The activation-energy barrier for the reaction pathway.

  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 energy peak represents the transition state and the activation energy needed to reach it.
  3. Check atoms and energy: The correct answer is The activation-energy barrier for the reaction pathway.

The energy peak represents the transition state and the activation energy needed to reach it.

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