Question

what do these two changes have in common?
water vapor condensing on a bathroom mirror
picking up a paper clip with a magnet
select all that apply.
both are chemical changes. both are only physical changes.
both are caused by cooling. both are changes of state.
submit

Explanation:

• Chemical vs Physical Changes:
• A chemical change results in the formation of new substances. In water vapor condensing (gas to liquid) and a magnet picking up a paper - clip (no new substance formed), no new substances are created. So, they are not chemical changes.
• A physical change is a change in which the form or appearance of a substance changes, but its chemical composition remains the same. Condensation is a physical change (change of state from gas to liquid), and picking up a paper - clip with a magnet is also a physical change (no change in the chemical nature of the paper - clip or the magnet).
• Causes and State Changes:
• Picking up a paper - clip with a magnet is not caused by cooling.
• Picking up a paper - clip with a magnet is not a change of state.

Answer:

Both are only physical changes.