What do these two changes have in common?
cooking a pancake
salt and vinegar removing tarnish from a penny

 - Both are caused by cooling.
 - Both are only physical changes.
 - Both are caused by heating.
 - Both are chemical changes.
Step 1: Think about each change.
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!
Salt and vinegar removing tarnish from a penny is a chemical change. The salt and vinegar change the tarnish into a different type of matter that can be easily wiped away. This makes the penny look shiny again.
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.
Cooking is caused by heating. But salt and vinegar removing tarnish from a penny is not.
Both are caused by cooling.
Neither change is caused by cooling.