What do these two changes have in common?
shaking up salad dressing
water boiling on a stove

 - 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.
Shaking up salad dressing is a physical change. The different parts mix together, but they are still made of the same type of matter.
Water boiling on the stove is a change of state. So, it is a physical change. The liquid changes into a gas, but a different type of matter is not formed.
Step 2: Look at each answer choice.
Both are only physical changes.
Both changes are physical changes. No new matter is created.
Both are chemical changes.
Both changes are physical changes. They are not chemical changes.
Both are caused by heating.
Water boiling is caused by heating. But shaking up salad dressing is not.
Both are caused by cooling.
Neither change is caused by cooling.