What do these two changes have in common?
shaking up salad dressing
ice melting in a glass

 - Both are caused by cooling.
 - Both are chemical changes.
 - Both are only physical changes.
 - Both are caused by heating.
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.
Ice melting in a glass is a change of state. So, it is a physical change. The solid ice becomes liquid, but it is still made of water. A different type of matter is not made.
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.
Ice melting is caused by heating. But shaking up salad dressing is not.
Both are caused by cooling.
Neither change is caused by cooling.