What do these two changes have in common?
shaking up salad dressing
using a large magnet to remove pieces of iron from a junkyard
A: Both are only physical changes.
B: Both are caused by heating.
C: Both are chemical changes.
D: Both are caused by cooling.
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.
Using a large magnet to remove pieces of iron from a junkyard is a physical change. Both the iron and the magnet are still made of the same type of matter as before.
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.