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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 happens to particles during a solid melting?

Please select an answer first.

Correct answer: A

The correct answer is They gain energy and move more freely while remaining the same substance..

  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 increases particle motion and changes the state, but the particles remain the same substance.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Melting increases particle motion and changes the state, but the particles remain the same substance.

2. QuestionMultiple choice

What happens to particles when a liquid evaporates?

Please select an answer first.

Correct answer: B

The correct answer is Some particles gain enough energy to leave the liquid and become gas particles..

  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: Evaporation is a physical change in which higher-energy surface particles enter the gas state.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Evaporation is a physical change in which higher-energy surface particles enter the gas state.

3. QuestionMultiple choice

Why can a gas be compressed more easily than a solid?

Please select an answer first.

Correct answer: C

The correct answer is Gas particles have much more empty space between them..

  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: The large spaces between gas particles can be reduced, while solid particles are already closely arranged.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

The large spaces between gas particles can be reduced, while solid particles are already closely arranged.

4. QuestionMultiple choice

What does temperature measure in a particle model?

Please select an answer first.

Correct answer: D

The correct answer is The average kinetic energy of the particles.

  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: Temperature reflects the average motion or kinetic energy of particles in a substance.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Temperature reflects the average motion or kinetic energy of particles in a substance.

5. QuestionMultiple choice

What happens to particle motion when a substance is heated?

Please select an answer first.

Correct answer: A

The correct answer is The particles generally move faster..

  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: Adding thermal energy usually increases the average kinetic energy of the particles.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Adding thermal energy usually increases the average kinetic energy of the particles.

6. QuestionMultiple choice

Why does a liquid take the shape of its container?

Please select an answer first.

Correct answer: B

The correct answer is Its particles can move past one another while remaining close together..

  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: Liquid particles remain close but can flow, allowing the liquid to take the shape of its container.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Liquid particles remain close but can flow, allowing the liquid to take the shape of its container.

7. QuestionMultiple choice

What is density?

Please select an answer first.

Correct answer: C

The correct answer is Mass per unit volume.

  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: Density compares how much mass is packed into a given volume and is a physical property.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Density compares how much mass is packed into a given volume and is a physical property.

8. QuestionMultiple choice

A sealed sample changes from liquid to gas. What happens to its total mass?

Please select an answer first.

Correct answer: D

The correct answer is The total mass stays the same if no matter leaves the system..

  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: A change of state rearranges particles, so the mass is conserved in a closed system.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

A change of state rearranges particles, so the mass is conserved in a closed system.

9. QuestionMultiple choice

Why does salt seem to disappear when it dissolves in water?

Please select an answer first.

Correct answer: A

The correct answer is Salt particles spread among water particles but remain present in the solution..

  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: Dissolving is a physical process in which particles disperse; the salt can be recovered by removing the water.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Dissolving is a physical process in which particles disperse; the salt can be recovered by removing the water.

10. QuestionMultiple choice

Which observation best supports that dissolving sugar is usually a physical change?

Please select an answer first.

Correct answer: B

The correct answer is Sugar can be recovered by evaporating the water..

  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: Recovery of the original sugar shows that its chemical identity was preserved during dissolving.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Recovery of the original sugar shows that its chemical identity was preserved during dissolving.

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