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Let's teach! Primary

Lesson 3

How can changing materials from solid to liquid be useful?

Lesson Plan

Preparation

  • Gather some of the examples of the materials discussed on the student summary i.e. glass, steel, aluminium, plastic.
  • Students will need access to the internet and other reference material to complete the research activity on investigation sheet.

Curriculum links

  • Australian Curriculum: ACSSU046, ACSHE051, ACSIS054, ACSIS055, ACSIS060
  • NSW Curriculum: ST2-6MW-S, ST2-10ES-S, ST2-1WS-S
  • VIC Curriculum: VCSSU056, VCSSU059, VCSIS066, VCSIS067, VCSIS068, VCSIS072
  • WA Curriculum: ACSSU046, ACSHE051, ACSIS054, ACSIS055, ACSIS060

Suggested teaching strategies

  • Collaborative learning strategies

Introduction

  • Provide some of the examples of the materials discussed in the student summary for the class to examine i.e. glass, steel, aluminium and plastic.
  • Students will need access to the internet and other reference material complete the research activity on the investigation sheet.
  • The student summary and worksheet should be used together.

Development

  • Provide students with printable versions of the student summary and worksheet. Have students complete the worksheet. Students can work in a small group for the activity on the worksheet.
  • Suggestions for solid and liquid materials for them to investigate could include: car batteries; outdated medicines; cooking oil; paint; specific or general cleaning products such as varnish and bleach; asbestos; electronic goods such as computers, tyres; mobile phones and televisions; glass; metal; cars and other vehicles; pesticides; boat flares; gas cylinders; pool chemicals.

Differentiation

  • Groups for investigation sheet could be arranged based on student ability.

Conclusion

  • With assistance, students work out how to present their research to the class or small group. Compare and discuss the information found about the same materials.

Assessment

Worksheet answers

1. Teacher check
2. Answers should indicate that when gold is mined it can be heated to become a liquid and poured into moulds to make ingots of a set size. These are easier to buy and transport. Ingots can be melted again to make gold products.
3. (a) plastic: Teacher check examples (b) steel: Teacher check examples (c) aluminium: Teacher check examples (d) glass: Teacher check examples
4. Teacher check
5. Teacher check

Science as a Human Endeavour question

Teacher check

Investigation sheet answers

Teacher check

Student Pages

Science Year 3 Unit 2 Lesson 3 Intro 1
Lesson 3
How can changing materials
from solid to liquid be useful?
Science Year 3 Unit 2 Lesson 3 Intro 2
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Lesson 3
How can changing materials
from solid to liquid be useful?
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Science Year 3 Unit 2 Lesson 3 Slide 1

Solids can be changed to liquids and liquids can be changed to solids.

This can be very useful in our everyday lives.

Science Year 3 Unit 2 Lesson 3 Slide 2

Science – Unit 2 – Lesson 3 – image – batter

Science – Unit 2 – Lesson 3 – image – baking

A lump of solid butter can be melted to become liquid and mixed with other ingredients to make biscuits, cakes and so on.

Science Year 3 Unit 2 Lesson 3 Slide 3

Water can be made into solid ice blocks to keep drinks cold or food cold in coolers.

Science Year 3 Unit 2 Lesson 3 Slide 4

We can choose between a solid bar of soap to wash ourselves in the shower or a pump bottle of liquid soap.

Can you think of other useful ways we change solids to liquids and liquids to solids?

Science Year 3 Unit 2 Lesson 3 Slide 5

There are reasons people in different jobs change materials from liquid to solid and solid to liquid.

Think about people who work with a metal such as gold.

Science Year 3 Unit 2 Lesson 3 Slide 6

After it is mined and treated, gold is heated until it becomes a liquid and a set amount can be poured into a container.

It is cooled and becomes a solid again - it has become a gold ingot.

Science Year 3 Unit 2 Lesson 3 Slide 7

This makes it easier for manufacturers to buy and transport.

The ingot will be melted again before being made into jewellery, coins, caps for teeth and so on.

Science Year 3 Unit 2 Lesson 3 Slide 8

Did you know that changing solids to liquids and liquids to solids is also very useful for recycling may materials?

Here’s how this characteristic helps four different kinds of materials to be recycled.

Science Year 3 Unit 2 Lesson 3 Slide 9

Glass

Glass bottles and jars have metal lids removed and stickers taken off the outside.
Then they are crushed and sent as solid pieces to a glass factory.

Science Year 3 Unit 2 Lesson 3 Slide 10

The pieces are mixed with other materials needed to make glass and placed in an extremely hot furnace to melt.
When cooled, this mixture can be moulded into new glass bottles and jars - solids once again!

Science Year 3 Unit 2 Lesson 3 Slide 11

Steel

Solid steel objects are sent to a steelmaking plant where they are melted down with other materials.

Science Year 3 Unit 2 Lesson 3 Slide 12

The liquid metal is poured into moulds and left to become solid.

A machine cuts it into large pieces to be sent to various factories to make new steel products such as tools and car parts.

Science Year 3 Unit 2 Lesson 3 Slide 13

Aluminium

Aluminium cans are squashed into bales.
These are shredded and have the paint removed.

Science Year 3 Unit 2 Lesson 3 Slide 14

The pieces are melted then poured into containers to make ingots.

These are rolled into very thin, coiled aluminium sheets and made into new aluminium cans.

Science Year 3 Unit 2 Lesson 3 Slide 15

Plastic

Plastic bottles are sorted into different types then squashed into bales.
A machine cuts them into flakes.

Science Year 3 Unit 2 Lesson 3 Slide 16

These are cleaned, melted down, then made into new plastic items such as garden chairs, bottles and bins.

Science Year 3 Unit 2 Lesson 3 Final Slide
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Downloads

Student Summary

Summary of student page information

Worksheet

Activities for students to complete

Investigation Worksheet

An experiment to consolidate learnings

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