Phase Change 1.2 Warmup

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Phase Change
Lesson 1.3: Investigating the
Molecular Scale

Open Ended

Give an example of a phase change that you have observed.

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Activity 1

Make Page 67-
Investigation Phase
Change
Get page from red bin in
front
Glue or tape on page 67.

5 MIN

Phase Change: Lesson 1.3

Investigation- PHASE CHANGE- 67

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Activity 2
Considering Molecules
and Phase Change

15 MIN

Phase Change: Lesson 1.3

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Phase Change: Lesson 1.3

In the previous lesson, we discussed the
appearance of substances at the macroscale
during everyday phase changes. We saw that a solid keeps its shape, liquids can flow, and gases spread out and fill in the space.

These key concepts summarize what you
were able to observe with just your human
eye.

Activity 2 - Screen 1

Multiple Choice

When observing the different phases with your human eye, we can observe that

• the matter acts differently

• the matter cannot be seen

• the matter looks exactly the same

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Phase Change: Lesson 1.3

Having knowledge about
the differences between
the phases is not enough
to help us solve the
mystery of the methane
lake on Titan.

Activity 2 - Screen 1

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Phase Change: Lesson 1.3

We need to understand
more about what makes
the phases different and
what happens during
freezing and
evaporation.

Activity 2 - Screen 1

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Phase Change: Lesson 1.3

We will observe substances on two scales.

Activity 2 - Screen 1

Multiple Choice

Which scale will you need a tool to see?

• macroscale

• molecular scale

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Vocabulary

Phase Change: Lesson 1.3

the relative size of things

Activity 2 - Screen 1

​scale

Multiple Choice

Scale is the

• amount something weighs

• absolute size of things

• relative size of things

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Vocabulary

Phase Change: Lesson 1.3

a group of atoms joined together in a particular way

molecule

Activity 2 - Screen 1