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Lesson 6 - Rusting

Rust, oxide, oxidation, corrosion

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  • Start
    • Why are things made of metal often painted?�-Time lapse rusting video - this is best played at half speed
  • Main
    • Introduce rusting
    • Word and balanced symbol equations
    • Pupils answer questions
    • Introduce the need for water and oxygen�-Boats rusting video
    • Brainstorm how to prevent rusting�
  • Plenary
    • Application of knowledge: bicycle rusting worksheet Bike rusting WS.docx / Exam Qs

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Rust, oxide, oxidation, corrosion

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Lesson 4 - Rusting

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Why are things made of metal often painted?

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Rust, oxide, oxidation, corrosion

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Time lapse of a steel plate rusting

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Lesson 4 - Rusting

  • To describe what rusting is

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  • To describe the conditions necessary for rusting

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  • To explain how we can prevent rusting

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Rusting

Rusting is a term used to describe the oxidation or corrosion of iron (Fe)��The prevention and control of rusting is financially important

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Rusting

Rust is iron oxide (Fe2O3)

  1. What is the word equation?�
  2. Symbol equation?�
  3. Balanced symbol equation?

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Iron + oxygen → Iron oxide

Fe + O2 → Fe2O3

4Fe + 3O2 → 2Fe2O3

Rust, oxide, oxidation, corrosion

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Learning check - Discuss

    • What is rusting?
    • What other word can we use to describe rusting?
    • Which type of metal rusts?

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Extension: What two conditions are required for rusting to occur?

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Learning check

    • What is rusting? The oxidation of iron.
    • What other word can we use to describe rusting? Corrosion
    • Which metal rusts? Iron and its alloys (steel)

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Oxygen

  • Rusting refers to the combination of iron and oxygen
  • When other metals react with oxygen we call it tarnishing.
  • Oxygen causes the alkali metals to change from shiny to dull (lithium and sodium)

Lesson 5 patterns in reactivity. 5.3. Periodic table unit

Rust, oxide, oxidation, corrosion

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Why do boats rust more rapidly than trains?

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Intro

Results

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Water

  • Water is also necessary for rusting to occur

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  • This includes water vapour which is in the air around us

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  • If we can stop water or oxygen getting to a metal they will not rust

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How could we prevent rusting?

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Draw a circle with ‘rusting’ in the middle.

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Brainstorm the ways you can think of that we can stop rusting

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Preventing

Rusting

Painting

Galvanising

Coating

Greasing

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Plenary

Complete the bike rusting worksheet Bike rusting WS.docx

Exam questions

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Protecting your bike from rusting

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Protecting your bike from rusting

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Logos / symbols

Rust, oxide, oxidation, corrosion