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Chemical and Physical Changes Practice Tests

These Grade 7 Science practice tests build understanding of physical and chemical properties, states of matter, particle motion, evidence of reactions, conservation of mass, and energy changes.

Skills covered

  • Distinguishing physical properties from chemical properties
  • Classifying melting, dissolving, cutting, burning, rusting, and reactions as physical or chemical changes
  • Using the particle model to explain states of matter and changes of state
  • Identifying reactants, products, evidence of chemical reactions, and conservation of atoms
  • Explaining exothermic and endothermic energy changes in matter systems

How to use these practice tests

For each question, ask whether the original substance keeps its chemical identity. Then use particle motion, reaction evidence, mass measurements, and energy observations to choose the best-supported answer.

For more Grade 7 Science practice, return to the Grade 7 Science category.

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Grade 7 Chemical and Physical Changes Practice Tests

Practice Grade 7 Science questions about physical properties, chemical properties, matter changes, reactions, conservation of mass, and energy.

Choose the best answer for each question. Review the explanation after submitting your answers.

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

What is an exothermic change?

Please select an answer first.

Correct answer: A

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

  1. Identify the matter change: Decide whether the substance keeps the same chemical identity or forms one or more new substances.
  2. Use the evidence: Exothermic processes transfer energy to the surroundings, often causing the surroundings to warm.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Exothermic processes transfer energy to the surroundings, often causing the surroundings to warm.

2. QuestionMultiple choice

What is an endothermic change?

Please select an answer first.

Correct answer: B

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

  1. Identify the matter change: Decide whether the substance keeps the same chemical identity or forms one or more new substances.
  2. Use the evidence: Endothermic processes take in energy, often causing the surroundings to cool.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Endothermic processes take in energy, often causing the surroundings to cool.

3. QuestionMultiple choice

Why does ice absorb energy while melting?

Please select an answer first.

Correct answer: C

The correct answer is Energy is used to loosen the attractions that hold particles in the solid arrangement..

  1. Identify the matter change: Decide whether the substance keeps the same chemical identity or forms one or more new substances.
  2. Use the evidence: Melting requires energy to change the arrangement of water particles while preserving their chemical identity.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Melting requires energy to change the arrangement of water particles while preserving their chemical identity.

4. QuestionMultiple choice

Which observation suggests an exothermic reaction?

Please select an answer first.

Correct answer: D

The correct answer is The temperature of the surroundings increases without an external heater..

  1. Identify the matter change: Decide whether the substance keeps the same chemical identity or forms one or more new substances.
  2. Use the evidence: An exothermic reaction releases energy, which can raise the temperature of the surrounding material.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

An exothermic reaction releases energy, which can raise the temperature of the surrounding material.

5. QuestionMultiple choice

Why does a cold pack become cold when its chemicals mix?

Please select an answer first.

Correct answer: A

The correct answer is The process absorbs thermal energy from the surroundings..

  1. Identify the matter change: Decide whether the substance keeps the same chemical identity or forms one or more new substances.
  2. Use the evidence: An endothermic process takes in energy from nearby skin or air, lowering their temperature.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

An endothermic process takes in energy from nearby skin or air, lowering their temperature.

6. QuestionMultiple choice

What happens to particle motion when a substance cools?

Please select an answer first.

Correct answer: B

The correct answer is The average kinetic energy of its particles decreases..

  1. Identify the matter change: Decide whether the substance keeps the same chemical identity or forms one or more new substances.
  2. Use the evidence: Cooling usually lowers the average kinetic energy, so particles move more slowly.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Cooling usually lowers the average kinetic energy, so particles move more slowly.

7. QuestionMultiple choice

What happens at the melting point of a pure substance?

Please select an answer first.

Correct answer: C

The correct answer is The substance changes from solid to liquid at a characteristic temperature under a given pressure..

  1. Identify the matter change: Decide whether the substance keeps the same chemical identity or forms one or more new substances.
  2. Use the evidence: Melting point is a physical property describing the temperature at which a solid becomes a liquid.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Melting point is a physical property describing the temperature at which a solid becomes a liquid.

8. QuestionMultiple choice

Why can boiling water and burning wood both involve bubbles or smoke but represent different changes?

Please select an answer first.

Correct answer: D

The correct answer is Boiling is a state change, while burning forms new substances..

  1. Identify the matter change: Decide whether the substance keeps the same chemical identity or forms one or more new substances.
  2. Use the evidence: Water boiling is physical vaporization; burning wood is a chemical reaction that forms ash and gases.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Water boiling is physical vaporization; burning wood is a chemical reaction that forms ash and gases.

9. QuestionMultiple choice

What is the best way to compare energy changes in a classroom reaction?

Please select an answer first.

Correct answer: A

The correct answer is Measure the temperature before and after the reaction while controlling other conditions..

  1. Identify the matter change: Decide whether the substance keeps the same chemical identity or forms one or more new substances.
  2. Use the evidence: Controlled temperature measurements provide evidence about energy transfer to or from the surroundings.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Controlled temperature measurements provide evidence about energy transfer to or from the surroundings.

10. QuestionMultiple choice

Why is energy still conserved during a chemical reaction?

Please select an answer first.

Correct answer: B

The correct answer is Energy may transfer or change form, but it is not created or destroyed..

  1. Identify the matter change: Decide whether the substance keeps the same chemical identity or forms one or more new substances.
  2. Use the evidence: Chemical energy can become thermal, light, electrical, or other forms while the total energy is conserved.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Chemical energy can become thermal, light, electrical, or other forms while the total energy is conserved.

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