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7th grade · Science · Unit 5 of 12

Chemical Reactions

New substances form, and atoms are conserved.

What your child practices

Practices signs of chemical reactions, how properties change when new substances form, conservation of mass, and devices that release or absorb thermal energy through reactions.

Oregon State Standards learning standard: 7.PS1.2; 7.PS1.5; 7.PS1.6 · properties change in chemical reactions, atoms are conserved, and reactions can release or absorb energy

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Atoms in a reaction are…

    • rearranged, not created or destroyed
    • changed into energy only
    • created from nothing
    • destroyed

  2. Question 2

    Which property could show a new substance formed?

    • A different amount
    • A different melting point
    • A different container
    • A different shape

  3. Question 3

    A color change when two clear liquids mix may show…

    • evaporation
    • a chemical reaction
    • a change of state
    • only mixing

  4. Question 4

    Substances made by a reaction are…

    • elements only
    • reactants
    • mixtures only
    • products

  5. Question 5

    Which is a chemical change?

    • Dissolving sugar
    • Breaking glass
    • Burning a candle wick
    • Freezing juice

  6. Question 6

    Silver tarnishing black is a…

    • mixture
    • chemical change
    • change of state
    • physical change

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