Which of these is a demonstration of a chemical change?
a. ice melting into water
b. wood becomes charred and black from burning
c. water evaporates from a sugar solution, leaving behind sugar crystals
d. a balloon suddenly popping
explain the answer : )

The answer would be B. Wood becomes charred and black from burning. This is because A and C are both simply water changing state, therefore these are both physical changes. D is simply air escaping so there is no chemical change. In B, however, the wood is being burned in a combustion reaction which causes a chemical change.