Question

what do these two changes have in common?
adding dish soap to water in a sink
crushing a mineral into powder
select all that apply.
both are only physical changes.
both are chemical changes.
both are caused by heating.
both are caused by cooling.

Explanation:

1. Analyze "adding dish soap to water": This is a physical change as the soap dissolves in water, and no new substance is formed. It doesn't involve heating or cooling.
2. Analyze "crushing a mineral into powder": This is a physical change (changing the size/shape of the mineral, no new substance) and also doesn't involve heating or cooling.
3. Evaluate the options:

• "Both are only physical changes": Correct, as both changes don't alter the chemical identity of the substances (soap - water mixture still has soap and water; crushed mineral is still the same mineral).
• "Both are chemical changes": Incorrect, as no chemical reactions occur (no new substances).
• "Both are caused by heating": Incorrect, neither change involves heating.
• "Both are caused by cooling": Incorrect, neither change involves cooling.

Answer:

A. Both are only physical changes.