# Phase Change Foldables

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## Objective

SWBAT review their knowledge of the 4 phase changes by creating a foldable.

#### Big Idea

Foldables are very useful review and study tools.

## Engage

5 minutes

Teacher Tip: This lesson is a review of the 4 phase changes of matter. Students create a foldable which is a useful review as study tool, especially for English language learners and students with learning difficulties.

Because students are considering the changes in thermal energy, NGSS MS-PS1-4 is addressed in this lesson, even though it's a review activity.This is great to do at any point of the unit. I tend to do them before a lab where I know they'll need to be strong in the concepts and vocabulary or before a test review as a study tool. Materials needed for this lesson are: scissors, one sheet of paper (any kind) per student, markers.

To get the students engaged in the topic, I have them start by recalling examples of the 4 phase changes and writing their examples in their student notes sheet

Give an example for the 4 phase changes below.

Melting-

Freezing-

Evaporation-

Condensation-

If needed, student thinking can be spurred with visuals or realia (depending on the weather).

After 3-4 minutes, I ask for 1-2 responses and record them on the board for others to reference.

## Explore

5 minutes

To have students prepared to create the foldable, I move through the components of the foldable in different sections or chunks so as not to overwhelm them. In this section, the students define the phases in their own words on the notes sheet, and these are used on the foldable:

Define the 4 phase changes below.

Melting-

Freezing-

Evaporation-

Condensation-

Sample responses include:

Melting- solid changing to liquid because of heat

Freezing- liquid changing to solid because of a loss of heat

Evaporation- liquid changing to gas  because of heat

Condensation- gas changing to liquid because of a loss of heat

## Explain

10 minutes

Now, students recall the motion of the particles for each phase change by completing the following on their notes sheet:

Describe the particle motion for the 4 phase changes below.

Melting-

Freezing-

Evaporation-

Condensation-

Sample responses include:

Melting- molecules are speeding up and are spreading out

Freezing- molecules are slowing down and getting closer together

Evaporation- molecules are speeding up and spreading out

Condensation- molecules are slowing down and getting closer together

## Elaborate/Evaluate

25 minutes

Students now create the foldable and use the checklist below to complete it.

Create a foldable for the 4 phase changes including the following criteria.

• 4 phase change names

• description of the 4 phase changes

• diagram of the particle changes

• example for each phase change