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
3 answers
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No.
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0 answers