What do these two changes have in common?
cooking an egg
burning food on a stove

 - Both are chemical changes.
 - Both are only physical changes.
 - Both are caused by cooling.
Step 1: Think about each change.
Cooking an egg is a chemical change. The heat causes the matter in the egg to change. Cooked eggs and raw eggs are made of different types of matter.
Food burning on a stove is a chemical change. The type of matter in the food changes. The food 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.