Question

Which of the following is a chemical change?
a. Freezing water
b. Melting ice
c. Bending a wire
d. Burning paper

Answer 1

a). Water is still H₂O after it freezes.

b). Ice is still H₂O after it melts.

c). Wire is still Cu when it's bent.

d). Paper combines with the O₂ in the air, and turns into
     a lot of new compounds when it burns.