Year 7 Science · Unit 2 · Lesson 2

Particle Model

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Learning Goals

Warm Up

Because… chain

Fill in the missing effects. Each cause leads to the next step in heating an ice cube until it becomes steam.

An ice cube is placed on a warm bench.
→
The ice particles vibrate faster and break free of their rigid arrangement.
→
The liquid water is placed on a stove and heated to 100°C.
→
Water particles gain enough energy to overcome the forces holding them in the liquid.
→

Overall outcome:

Your Turn

Compare two

Complete the table to compare solid particles and gas particles using what you learned from the particle model.

FeatureSolidGas
Spacing between particles
How particles move
Forces between particles
Can it be compressed?
Does it have a fixed shape?

Show What You Know

1. When a steel railway track gets very hot on a summer day, it can expand and bend. Use particle theory tenet 5 to explain why this happens at the particle level.

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2. You open a bottle of eucalyptus oil and within a few seconds you can smell it across the room. Name the process and use tenet 2 (particles are always moving) to explain why this happens.

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Wrap Up

In one sentence, what was the main idea of this lesson?

HSCScience · Year 7 Science · Unit 2 · Lesson 2 · Apply Worksheet