What do these two changes have in common?
baking an apple pie
burning a piece of wood

 - Both are caused by cooling.
 - Both are only physical changes.
 - Both are chemical changes.
Step 1: Think about each change.
Baking an apple pie is a chemical change. The type of matter in the pie changes. The apples become soft, and the crust turns brown.
Burning a piece of wood is a chemical change. When the wood burns, the type of matter in it changes. The wood turns black and gives off smoke.
Step 2: Look at each answer choice.
Both are only physical changes.
Both changes are chemical changes. They are not physical changes.
Both are chemical changes.
Both changes are chemical changes. The type of matter before and after each change is different.
Both are caused by heating.
Both changes are caused by heating.
Both are caused by cooling.
Neither change is caused by cooling.