Question

Which of the following is an example of a chemical change?

Answer

melting a stick of butter

dissolving salt in water

using magnesium to displace hydrogen gas from water

Answer 1

Melting a stick of butter and dissolving salt in water are physical changes, so the only answer is using magnesium to displace hydrogen gas from water.

Answer 2

in a chemical reaction products are formed so its C

Answer 3

thanks