Question

Identify which of the following changes is exothermic.

a) liquid water boils to steam
b) liquid water freezes to give ice
c) ice melts to give liquid water
d) liquid water increases in temperature from 35 C to 45 C

Answer 1

heat comes out when you convert water to ice

Answer 2

b.The liquid water freezes because heat is given off from it(exothermic) to form ice unlike other options.

Answer 3

For water to to boil,ice to melt and for temperature to increase from 35C to 45C,it means heat is absorbed(endothermic).

Answer 4

Yes, I agree with you Jonathan.