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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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5 Tests
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1. Test

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 are reactants?

Please select an answer first.

Correct answer: A

The correct answer is The substances present at the start of 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: Reactants are consumed or rearranged as a reaction produces new substances.
  3. Check atoms and energy: The correct answer is The substances present at the start of a chemical reaction.

Reactants are consumed or rearranged as a reaction produces new substances.

2. QuestionMultiple choice

What are products?

Please select an answer first.

Correct answer: B

The correct answer is The new substances formed by 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: Products appear after atoms are rearranged during a chemical reaction.
  3. Check atoms and energy: The correct answer is The new substances formed by a chemical reaction.

Products appear after atoms are rearranged during a chemical reaction.

3. QuestionMultiple choice

Which observation most strongly suggests a chemical change?

Please select an answer first.

Correct answer: C

The correct answer is A solid precipitate forms when two clear solutions are mixed..

  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: Formation of a new solid can indicate that a new substance formed.
  3. Check atoms and energy: The correct answer is A solid precipitate forms when two clear solutions are mixed..

Formation of a new solid can indicate that a new substance formed.

4. QuestionMultiple choice

Why must the total number of each type of atom be the same before and after a reaction?

Please select an answer first.

Correct answer: D

The correct answer is Atoms are rearranged but are not created or destroyed in an ordinary 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: Conservation of matter requires the same atoms on both sides of a chemical equation.
  3. Check atoms and energy: The correct answer is Atoms are rearranged but are not created or destroyed in an ordinary chemical reaction..

Conservation of matter requires the same atoms on both sides of a chemical equation.

5. QuestionMultiple choice

What is a precipitate?

Please select an answer first.

Correct answer: A

The correct answer is A solid that forms from a solution during a 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: A precipitate is an insoluble solid produced when dissolved substances react.
  3. Check atoms and energy: The correct answer is A solid that forms from a solution during a reaction.

A precipitate is an insoluble solid produced when dissolved substances react.

6. QuestionMultiple choice

Which observation can indicate gas formation during a reaction?

Please select an answer first.

Correct answer: B

The correct answer is Bubbles appear in the mixture even though it is not boiling..

  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: Unexpected bubbles can show that a gaseous product formed.
  3. Check atoms and energy: The correct answer is Bubbles appear in the mixture even though it is not boiling..

Unexpected bubbles can show that a gaseous product formed.

7. QuestionMultiple choice

Which observation can indicate an energy change during a reaction?

Please select an answer first.

Correct answer: C

The correct answer is The temperature of the mixture changes without external heating or cooling..

  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 temperature change can show that energy was released or absorbed by the reaction.
  3. Check atoms and energy: The correct answer is The temperature of the mixture changes without external heating or cooling..

A temperature change can show that energy was released or absorbed by the reaction.

8. QuestionMultiple choice

Which observation is evidence of a possible chemical change?

Please select an answer first.

Correct answer: D

The correct answer is The mixture develops a new color that is not caused by dilution or an indicator..

  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 unexplained color change can indicate formation of a new substance.
  3. Check atoms and energy: The correct answer is The mixture develops a new color that is not caused by dilution or an indicator..

An unexplained color change can indicate formation of a new substance.

9. QuestionMultiple choice

What is a reversible reaction?

Please select an answer first.

Correct answer: A

The correct answer is A reaction that can proceed in both forward and reverse directions under suitable conditions.

  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: In a reversible reaction, products can react to form reactants under appropriate conditions.
  3. Check atoms and energy: The correct answer is A reaction that can proceed in both forward and reverse directions under suitable conditions.

In a reversible reaction, products can react to form reactants under appropriate conditions.

10. QuestionMultiple choice

What does a chemical equation communicate?

Please select an answer first.

Correct answer: B

The correct answer is The reactants, products, and relative amounts in 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: A chemical equation represents which substances react and the ratios needed to conserve atoms.
  3. Check atoms and energy: The correct answer is The reactants, products, and relative amounts in a chemical reaction.

A chemical equation represents which substances react and the ratios needed to conserve atoms.

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