What do these two changes have in common?
sauce burning on a stove
cooking a pancake

 - Both are only physical changes.
 - Both are caused by cooling.
 - Both are chemical changes.
Step 1: Think about each change.
Sauce burning on a stove is a chemical change. High temperatures case the sauce to react with oxygen in the air. The sauce turns black and no longer tastes good.
Cooking a pancake is a chemical change. Pancakes are made from pancake batter. A cooked pancake is a different type of matter than pancake batter. Pancake batter is wet and slippery. Cooked pancakes are fluffy and can be good to eat!
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.