What do these two changes have in common?
breaking a piece of glass
tying a shoelace

 - Both are only physical changes.
 - Both are caused by cooling.
 - Both are chemical changes.
 - Both are caused by heating.
Step 1: Think about each change.
Breaking a piece of glass is a physical change. The glass gets broken into pieces. But each piece is still made of the same type of matter.
Tying a shoelace is a physical change. The shoelace gets a different shape. But it is still made of the same type of matter.
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.
Neither change is caused by heating.
Both are caused by cooling.
Neither change is caused by cooling.