What do these two changes have in common?
knitting yarn into a scarf
using a large magnet to remove pieces of iron from a junkyard
A: Both are caused by cooling.
B: Both are chemical changes.
C: Both are only physical changes.
D: Both are caused by heating.
Step 1: Think about each change.
Knitting yarn into a scarf is a physical change. The yarn gets a different shape, but it is 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.