Question

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

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

Answer 1

A because it could change back

Answer 2

A:

Answer 3

Thank you :)

Answer 4

D'you still have a prob. with this ques.?

Answer 5

i haven't gotten the answer yet...when the results come in I will say if it was right or wrong

Answer 6

so there is no use of asking it.

Answer 7

A