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7. Which of the following changes gives no evidence that a chemical reaction has taken place?

A cube of solid forms a puddle of liquid.
A certain liquid is added to a solid, and bubbles of gas form.
Two liquids are mixed, and a precipitate forms.
Heating a blue solid turns the solid white.

9. Which of the following represents a compound?
Na
He
H2O
Li

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  • Science -

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