NumicornNumicornLearn, solve, progress

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.

Select a test

5 Tests
1. Test2. Test3. Test4. Test5. Test

3. Test

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

Which observation is evidence of a chemical reaction?

Please select an answer first.

Correct answer: A

The correct answer is The formation of a new solid when two solutions are mixed.

  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 new solid, called a precipitate, can indicate that dissolved substances formed a new compound.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

A new solid, called a precipitate, can indicate that dissolved substances formed a new compound.

2. QuestionMultiple choice

Which observation can indicate a chemical reaction?

Please select an answer first.

Correct answer: B

The correct answer is A lasting color change caused by formation of a new 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: A persistent color change can be evidence that the particles have rearranged into a different substance.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

A persistent color change can be evidence that the particles have rearranged into a different substance.

3. QuestionMultiple choice

Why can bubbles be evidence of a chemical change?

Please select an answer first.

Correct answer: C

The correct answer is A new gas may have formed during the reaction..

  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: Gas production during a reaction is evidence of a new substance, although bubbles from boiling can be only a physical change.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Gas production during a reaction is evidence of a new substance, although bubbles from boiling can be only a physical change.

4. QuestionMultiple choice

Why can a temperature change indicate a chemical reaction?

Please select an answer first.

Correct answer: D

The correct answer is The reaction may absorb or release energy as new substances form..

  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 reactions can be endothermic or exothermic, causing the surroundings to cool or warm.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Chemical reactions can be endothermic or exothermic, causing the surroundings to cool or warm.

5. QuestionMultiple choice

What does a chemical equation represent?

Please select an answer first.

Correct answer: A

The correct answer is The substances that react and the substances that form.

  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 chemical equation models the reactants and products in a chemical reaction.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

A chemical equation models the reactants and products in a chemical reaction.

6. QuestionMultiple choice

What are reactants?

Please select an answer first.

Correct answer: B

The correct answer is The starting substances in a chemical reaction.

  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: Reactants are present before the reaction and are rearranged to form products.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Reactants are present before the reaction and are rearranged to form products.

7. QuestionMultiple choice

What are products?

Please select an answer first.

Correct answer: C

The correct answer is The new substances formed by a chemical reaction.

  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: Products are the substances present after the atoms have been rearranged in the reaction.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Products are the substances present after the atoms have been rearranged in the reaction.

8. QuestionMultiple choice

What happens to atoms in a chemical reaction?

Please select an answer first.

Correct answer: D

The correct answer is They are rearranged into new combinations; they are 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 reactions change how atoms are bonded and arranged, while the atoms themselves are conserved.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

Chemical reactions change how atoms are bonded and arranged, while the atoms themselves are conserved.

9. QuestionMultiple choice

Why can mixing baking soda and vinegar produce bubbles?

Please select an answer first.

Correct answer: A

The correct answer is The reaction produces carbon dioxide gas..

  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 acid-base reaction produces carbon dioxide, which escapes as visible bubbles.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

The acid-base reaction produces carbon dioxide, which escapes as visible bubbles.

10. QuestionMultiple choice

Which result most strongly supports that two substances reacted?

Please select an answer first.

Correct answer: B

The correct answer is The mixture has properties different from both starting 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: New properties, such as a precipitate, gas, lasting color change, or energy change, support chemical reaction evidence.
  3. Check the particle model: A physical change rearranges or separates particles, while a chemical change creates new particle arrangements and substances.

New properties, such as a precipitate, gas, lasting color change, or energy change, support chemical reaction evidence.

Previous testNext test