Page 64 - York Global Science 6 - Physical Science

Let’s Review
Competencies: ‘I can…’
I can describe and explain what
happens to the mass and density
of a substance when it changes
state.
I can describe what happens at
the boiling point, melting point
and freezing point of water.
I can describe how climate
scientists use what they know
about water to find out about
changes to the Earth.
I can describe how liquids change
into gases by evaporation.
I can describe physical and
chemical changes.
I can describe Brownian motion
and explain how diffusion works
in liquids and gases.
64
Questions
1 What happens to the particles
when a substance changes
state?
2 What happens to the mass and
density of a substance when
it changes state? Explain your
answer.
3 At what What temperature does
water boil?
4 At what temperature does water
freeze?
5 When is water in the liquid state?
6 What is the name of a scientist
who studies water?
7 Name three things this person
might do.
8 What happens to water particles
when they evaporate?
9 What is the difference between a
physical change and a chemical
change?
10 Make a list of ways to identify a
chemical change.
11 What is Brownian motion?
12 What is diffusion?