Question

What do these two changes have in common?

a puddle freezing into ice on a cold night
filtering air to remove dust and pollen
Select all that apply.
Both are only physical changes.
Both are chemical changes.
Both are caused by heating.
Both are caused by cooling.

Answer 1

Both are only physical changes. Both are caused by cooling.

Step-by-step explanation:

Filtering air to remove dust and pollen is also a physical change because it involves separating particles from a mixture, which doesn’t alter the chemical composition of the air or the particles. While this process isn’t directly caused by cooling, it’s worth noting that certain air filtration systems may involve cooling the air to help condense and capture smaller particles. However, the primary cause of this change is not cooling or heating, but rather the mechanical process of filtration. The statement 'Both are caused by cooling' is not entirely accurate, but it is the closest among the given options.