Pls help me identify which of these substance are a physical change or a chemical change . BAKING A CAKE
SETTING OFF A FIREWORK
BOILING WATER
BAKING BREAD DISSOLVING SUGAR IN TEA
MAKING WINE FROM GRAPES AND YEAST
MAKING CONCRETE FROM SAND CEMENT AND WATER

Sandy is building a small toy car. he wants to use a balloon to power the toy car. he fills a balloon with air and then attaches a straw to the balloon. he tapes the balloon-straw combination to the car and then releases the end of the balloon. the toy moves forward as the air from the balloon comes out the back of the straw. what can sandy do to make the toy car move faster? a) use less air in the balloon. b) blow up the balloon more. c) use a longer straw. d) use larger tires.