Question

Which is proof that in any synthesis reaction, a chemical change has occurred?

In a synthesis reaction, two reactants combine to form a new compound.

Many synthesis reactions involve a phase change.

In a synthesis reaction, oxygen is always converted to carbon dioxide.

All synthesis reactions are exothermic.

Answer 1

@matt101

Answer 2

What do you think?

Answer 3

I think it is A or C

Answer 4

2H2 + O2 --> 2H2O is an example of a synthesis reaction. No carbon dioxide there.

Answer 5

Okay, so it is A ?

Answer 6

Yup!

Answer 7

Thanks!