Which scenarios are definite signs that a chemical reaction has occurred?
_(Select all that apply)_

Water is heated and releases a gas.
Blue and yellow paint mix to make green paint.
A piece of iron begins to rust.
Two liquids are mixed together and release a light.

A and C?

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  1. yes

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  2. Thank you! :)

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  3. umm ... boiling water releases a gas , no chemical reaction
    ... dissolved gases come out of solution , then the water goes to steam

    a release of light indicates an energy change
    ... powered by a reaction

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  4. I interpreted A this way. A chemical reaction produces heat which boils the water enough to produce steam. The production of heat shows the presence of a chemical reaction.

    I agree with D as yes.

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