Which of the following describes a chemical change ?

a. burning paper
b. freezing water
c. bending water
d. melting ice

What heat is removed how does a gas become a liquid

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.