Access Prior Knowledge
Lesson 3: How do phase changes occur?
Opening Activity
Open Science textbook to page 354.
Open Science workbook to page 111A.
Open Science journal and answer the following questions: 1Describe the difference between molecules and compounds. 2What is an atom?
Open Science folder to review vocabulary words and outline for
the chapter.
Review Content Cards and Q-Cards in bin, sharing with partners
quizzing each
other quietly.
Log in to clickers using student ID number.
Be ready to review home learning when timer goes off.
Don't forget to write your home
learning in your agenda page 112A.
Do you agree with the statement?
Unlike liquids, solids have their own volume and
shape.
YES
NO
Do you agree with the statement?
The freezing point of a liquid is a chemical
property.
YES
NO
Do you agree with the statement?
In gases, the atoms or molecules are far apart.
YES
NO
Do you agree with the statement?
The boiling point of a liquid changes with the
amount of liquid.
YES
NO
Solids and Liquids
Solids have a definite shape and volume with particles
vibrating in place.
As temperature rises, solids melt and turn into liquids.
Liquids have a definite volume with forces holding particles
close but still flowing past each other taking shape of the
container.
Solids and Liquids
Freezing/Melting Point is the temperature where solids
freeze or melt, and is another physical property.
You can lower the freezing point of water by adding salt.
Materials change size when they change room temperature
because the hotter it gets the faster the particles move and
spread apart. The cooler it gets the slower the particles move
and the less space between them.
Gases
Gases do not have definite shape or volume and the particles
spread far apart.
Evaporation is when liquid turns to gas by raising temperature.
Condensation is when gas turns to liquid by lowering the
temperature, like in clouds or dew.
Another physical property is boiling point, temperature when a
liquid turns into a gas. Boiling points are the same even if you have
different amounts of material.
Steam from water boiling is small drops of water in a gas phase
called water vapor.
BRAIN POP: Matter Changing States
MatchQuest
SOLID
LIQUID
GAS
TextQuest
Answer in your Science Journal
1. What happens to some materials
as they cool?
2. What causes particles in ice to go
from being close together to far apart?
3. When does dew form?
4. Describe the difference between
evaporation and condensation.
Don't forget to write your home
learning in your agenda page 112A.