Rust Prevention

• Chemistry
• Secondary Education
• Age 12,13

Rust Prevention and Extraction of metals

Topic 6. Metals 

19 February 2024

Our Learning Map

Our Learning Map

Use a chemical equation to state the conditions required for the rusting of iron and steel to form rust

Our Learning Map

Use a chemical equation to state the conditions required for the rusting of iron and steel to form rust

Make a quick slide presentation or a digital poster to state and describe how barrier methods help prevent rust

Our Learning Map

State the conditions required for the rusting of iron and steel to form hydrated iron(III) oxide

Weigh the pros and cons of the barrier methods using new insights from the outputs of others.

Describe how barrier methods prevent rusting by excluding oxygen or water

Our Learning Map

State the conditions required for the rusting of iron and steel to form hydrated iron(III) oxide

State some common barrier methods, including painting, greasing and coating with plastic

Describe how barrier methods prevent rusting by excluding oxygen or water

- Explain sacrificial protection in terms of the reactivity series and in terms of electron loss

- Describe the use of zinc in galvanising as an example of a barrier method and sacrificial protection

Rust Prevention

Topic 6. Metals 

19 February 2024

Rewrite the word and symbol equations for rusting.

Questions to think about while watching the video.

a. Why do you think metal objects rust?

b. How can we prevent rusting from happening?

Rust Prevention

Topic 6. Metals 

19 February 2024

Rust Prevention

Topic 6. Metals 

19 February 2024

Lesson Key Points

• Rusting is a chemical reaction that occurs when iron or steel comes into contact with oxygen and water.
• Barrier methods prevent rusting by creating a physical barrier that excludes oxygen and water from the metal surface.
• Common barrier methods include painting, greasing, and coating with plastic.

Correcting Misconception

Rusting is inevitable for all metal objects.

Correcting Misconception

Rusting is inevitable for all metal objects.

Practical Work 4 

Analysis Test

Rust Prevention

Topic 6. Metals 

19 February 2024

Discussion

How can we prevent iron from rusting?

Methods of Rust Prevention

• Barrier methods
• Sacrificial methods

1) Barrier Methods

• Work by preventing oxygen and water from touching the iron.

1) Barrier Methods

• Work by preventing oxygen and water from touching the iron.

1) Barrier Methods

• Work by preventing oxygen and water from touching the iron.

1) Barrier Methods

• Work by preventing oxygen and water from touching the iron.

2) Sacrificial Methods

• Work by adding a more reactive metal to the iron, like aluminium or zinc.

2) Sacrificial Methods

• Work by adding a more reactive metal to the iron, like aluminium or zinc.

3) Barrier + Sacrificial Methods

Galvanising (uses both methods)

Rust Prevention

Topic 6. Metals 

19 February 2024

Collaborative Work 4C/E - "Save The Metal"

• Goal - Choose the best barrier method for protecting the metal object in the given scenario and explain the science behind each barrier method.
• Product/Output - Quick slide presentation/ digital poster (made in 10-15 minutes only)
• Standards - Marking rubric 

Plenary session

• Barrier methods
• Sacrificial methods

Metal Extraction and Reactivity

Topic 6. Metals 

19 February 2024

Our Learning Map

Our Learning Map

Sort out metals according to their reactivity

Our Learning Map

Sort out metals according to their reactivity

Use the position of metals in the reactivity series to predict a more suited extraction method

Our Learning Map

Sort out metals according to their reactivity

Formulate a list of extraction methods according to their costs and ease in obtaining the metals (e.g., most to least expensive method)

Use the position of metals in the reactivity series to predict a more suited extraction method

Lesson Key Points

• The position of metals in the reactivity series affects the ease of obtaining them from their ores.
• Metals higher in the reactivity series are more reactive and require more energy to extract.
• Metals lower in the reactivity series are less reactive and can be obtained using simpler extraction methods.

Metal Extraction and Reactivity

Topic 6. Metals 

19 February 2024

Collaborative Work 5C/E - "Extract Sort"

• Goal - Classify a list of metals based on their reactivity and predict the extraction methods required for each.
• Product/Output - List of metals
• Standards - Correct list.

• Sodium
• Platinum
• Gold
• Magnesium
• Iron
• Copper
• Zinc

Useful information

• Metals above carbon = Electrolysis
• Metals between hydrogen and carbon = Burning with carbon
• Metals below hydrogen but above silver = Burning directly in the air
• Metals from silver and below = No extraction needed

(Hydrogen)