Question

1
Which of the following is a chemical reaction?
А
Sodium and chlorine atoms bond to form salt molecules
B.
Ice melts to form water
С
Carbon dioxide freezes to form dry ice
D
Salt and water mix to form salt water

Answer 1

Answer:

a because two substances form a new substance

Explanation:

Answer 2

Answer:

A is the chemical reaction because  we can see rearrangement of the ionic structure of a substance, new bonds are forming up that results in the change in physical and chemical properties