Year 7 Science · Unit 2 · Lesson 2

Particle Model

Foundation Worksheet

Name

Date

Class

Learning Goals

Name all six state changes and match them to their definitions
Sort state changes into energy-absorbed and energy-released categories
Recall the five tenets of particle theory

Warm Up

Match each term to its definition

Draw a line connecting each term on the left to its correct definition on the right. Or write the matching letter next to each term.

Term	Your answer	Definition
Melting		A. Gas turns directly to a solid (e.g. frost on a windscreen)
Freezing		B. Liquid turns to solid (caused by cooling)
Evaporation		C. Solid turns directly to gas, skipping liquid (e.g. dry ice)
Condensation		D. Solid turns to liquid (caused by heating)
Sublimation		E. Gas turns to liquid (e.g. water droplets on a cold drink can)
Deposition		F. Liquid turns to gas (e.g. a puddle drying in the sun)

Your Turn

Sort it!

Write each state change from the pool into the correct category box — whether energy is absorbed (taken in) or released (given out) during that process.

Melting Freezing Evaporation Condensation Sublimation Deposition Boiling Frost forming

Energy absorbed (heating)

Energy released (cooling)

Show What You Know

1. Name TWO of the five tenets of particle theory and give a real-life example that shows each one is true.

Recall 2 marks

2. When a puddle dries after rain, has the water changed into a different substance? Explain your answer using the particle model.

Recall 2 marks

Wrap Up

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