physical changes Flashcards
1
Q
what are the three states of matter
A
solid, liquid and gas
2
Q
why are physical changes different from chemical changes
A
no actual reactions happen
no new substances are made
3
Q
what do physical changes not involve
A
a change in mass
4
Q
what will the mass be if 20g of ice melts
A
it will turn into 20g of water
5
Q
what is the physical change in melting
A
solid changes to liquid
6
Q
what is the physical change in freezing
A
liquid changes into solid
7
Q
what is the physical change in evaporating ( boiling )
A
liquid changes to gas
8
Q
what is the physical shange in condensing
A
gas changes to liquid
9
Q
what is the physical change in sublimation
A
solid changes to gas like dry ice
10
Q
what is the physical change in dissolving
A
solid mixes with a liquid to form a solution
11
Q
physical processes are…
A
reversible
