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Posted by on Tuesday, March 26, 2013 at 5:25pm.

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

  • Science - , Tuesday, March 26, 2013 at 5:27pm

    plz help

  • Science Ms. Sue - , Tuesday, March 26, 2013 at 5:34pm

    do you know science?

  • Science - , Tuesday, March 26, 2013 at 5:38pm

    No.

  • Science - , Tuesday, March 26, 2013 at 5:39pm

    Oh.......:(

  • Science - , Tuesday, February 28, 2017 at 6:27pm

    SpiersTheAmazingHd is the best u tube channel XD

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