Syllabus/Unit Code: C2 CHEMICAL RESOURCES Lesson number: L03 Lesson Title: The extraction and purification of copper

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Syllabus/Unit Code C2 CHEMICAL RESOURCESLesson
number L03 Lesson Title The extraction and
purification of copper
Learning Outcomes How I did Targets
Learning Outcome 1 To be able to extract copper from its ore. Grade C I am working at grade .....because ...................................................... I can move up to grade... by
Learning Outcome 2 To know how copper is purified. Grade B I am working at grade .....because ...................................................... I can move up to grade... by
Learning Outcome 3 To be able to discuss the above processes in terms of oxidation and reduction, using symbol equations. Grade A/A I am working at grade .....because ...................................................... I can move up to grade... by

• Connector Answer in full sentences
• What happens when most metal carbonates are
  heated?
• What name is given to this process?
• How could you identify the gas that is made?
• Write the word and symbol equation for the
  reaction that would happen if copper carbonate
  was heated.

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1. Metal carbonates decompose to give the metal
   oxide and carbon dioxide.
2. Thermal decomposition
3. Limewater turns milky when CO2 is bubbled through
   it.

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Extended Learning

• Research information and Collect Secondary data
  on
• What is an alloy?
• Give the composition, properties and uses of the
  following alloys
• amalgam, brass , bronze, solder and nitinol
• Photos and diagrams as appropriate.
• For each site you use, include its URL (web
  address) in a list at the end of your research.
  This is your list of references.
• or
• Homework sheet - Homework task HC2.6.1
• Due date
• Next lesson
• Research Report Criteria (6 marks total Grade
  A)
• 1) Range of different reliable sources used and
  references included (books/internet/survey etc),
• 2) Information written in own words
• 3) Clear and logical structure to research report
  including pictures/diagrams which have been
  referenced
• 4) No evidence of copy and paste!

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Key Question

• How is this lesson relevant to every day life?

• What skills will you be developing this lesson?
• Scientific Investigation- by Research and
  collecting secondary data, planning and
  collecting primary data, Analysis and Evaluation.
• Numeracy- by using formulae in calculations
• Literacy- by writing well structured sentences
  and paragraphs
• ICT- by using Laptops and electronic resources
• Personal skills- team work, leadership
• Thinking and Learning- organisation, logic,
  participation, memory, exploration, creativity,
  judgement, planning, practice.
• Reflection- through self or peer assessment of
  each Learning Outcome

• Quick Discussion
• What do you already know?

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Keywords
Here are some of the words we will be using this
lesson 1) Create sentences which use the
keywords correctly. 2) Put your hand up if there
is any key word from the list that you dont know
the meaning of.

• oxidation
• reduction
• electrolysis
• electrolyte
• electrode
• cathode
• anode

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New Information for Learning Outcome 1

• Explore and Discover
• Visual
• Audio
• Kinaesthetic

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Learning Activities for Outcome 1

• The extraction of copper from its ore.

Copper comes from minerals in the Earth
Malachite contains copper carbonate and easily
breaks down to form copper oxide
Copper is then extracted by heating the copper
oxide with carbon. This works because carbon is
more reactive than copper.
Malachite
Copper containing impurities is produced.
impure copper
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• Experiment - The extraction of copper from its
  ore.
• Part one
• Put about 3g of copper carbonate powder into a
  boiling tube.
• Adjust the Bunsen burner flame so that the air
  hole is half-open. Holding the test tube using
  the test tube holder, heat it gently until the
  contents turn black and stop rising. Let the tube
  cool down.

You must wear eye protection
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Experiment - The extraction of copper from its
ore.

• Part two
• Carefully tip the black product into the
  crucible. Add about 0.5 g of carbon powder and
  mix well. Put the lid on.
• Put the crucible on the pipe clay triangle and
  heat it strongly from below for about five
  minutes. Turn the Bunsen burner off.
• Allow the crucible to cool for several minutes.
• Tip the contents of the crucible into the beaker
  of water. Stir briefly, then let the solid
  contents settle. Carefully pour off the water.
• Add more water, stir, and allow the solid
  contents to settle as before. Carefully pour off
  the water
• Repeat step 5 until the water no longer contains
  black bits. Examine the solid at the bottom of
  the beaker and record its appearance.

You must wear eye protection
Draw a labelled diagram. Write the word and
symbol equations for this reaction.
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copper(II) oxide carbon              copper
carbon dioxide 2CuO(s)           C(s)   
              2Cu(s)         CO2(g)
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Demonstrate your Learning for Outcome 1
To be able to extract copper from its ore.
Analyse (B) I can write balanced symbol equations
for the extraction of copper.
Apply (C) I can follow instructions to extract
copper from its ore.
Understand (D) With help I can extract copper
from its ore.
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Learning Outcome 1 Review
To be able to extract copper from its ore.
Go back to your Learning Outcome grid and fill
out the How I did and the Targets column.
Learning Outcome How I did Targets
Learning Outcome 1 Grade C I am working at grade .....because ...................................................... I can move up to grade... by
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New Information for Learning Outcome 2

• Explore and Discover
• Visual
• Audio
• Kinaesthetic

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Learning Activities for Outcome 2

• Demonstration - Using electrolysis to purify
  copper.

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Understanding electrolysis Key words
Electrolysis uses electricity to separate an
ionic compound into its elements. Electrolyte is
the liquid that is used in electrolysis. Electro
de is the conducting rod used in
electrolysis. Anode is the positive
electrode. Cathode is the negative electrode.
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Understanding electrolysis How it works.
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Using electrolysis to purify copper - Summary
Copper dissolves off of the impure anode and
is deposited onto the pure cathode The
impurities are valuable and are collected, so
that silver and gold can be extracted from them.
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Demonstrate your Learning for Outcome 2
To know how copper is purified.
Analyse (B) I can List the stages in the
purification of copper including writing the
symbol equations for the reactions at the
electrodes.
Apply (C) I can Model the reactions at the
electrodes.
Understand (D) I can Explain how copper is
purified by electrolysis
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Learning Outcome 2 Review
Go back to your Learning Outcome grid and fill
out the How I did and the Targets column.
To know how copper is purified.
Learning Outcome How I did Targets
Learning Outcome 2 Grade B I am working at grade .....because ...................................................... I can move up to grade... by
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New Information for Learning Outcome 3

• Explore and Discover
• Visual
• Audio
• Kinaesthetic

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Learning Activities for Outcome 3

• Oxidation and reduction
• OXIDATION - loss of electrons or increase in
  oxygen.
• REDUCTION - gain of electrons or decrease in
  oxygen

OIL RIG Oxidation Is Loss Reduction Is Gain
OF ELECTRONS
Starting from malachite look at the stages in the
extraction and purification of copper and
identify those involving oxidation or reduction.
Explain your answers.
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1. Malachite is heated.

Thermal decomposition not a redox reaction.
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1. Copper(II) oxide and carbon are mixed and heated.

copper(II) oxide carbon      copper
carbon dioxide 2CuO (s)           C (s)       
  2Cu (s)         CO2 (g)
This is a REDOX reaction. Carbon is oxidised
by gaining oxygen to form carbon
dioxide. Copper (in CuO) is reduced by
losing oxygen to form copper metal.
copper has changed from Cu2 (in CuO) to Cu and
so has gained electrons Cu2 (s)    2e-  
   Cu (s)
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1. Using electrolysis to purify copper

Copper dissolves off of the impure anode
and is deposited onto the pure cathode
electrons lost so - OXIDATION
electrons gained so - REDUCTION
This is a REDOX reaction.
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Demonstrate your Learning for Outcome 3
To be able to discuss the above processes in
terms of oxidation and reduction, using symbol
equations.
Evaluate (A) I can Prove that the extraction and
purification of copper involves redox reactions.
Analyse (B) I can List the stages in the
extraction and purification of copper including
writing the symbol equations for all the
reactions.
Apply (C) I can Identify oxidation and reduction
reactions
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Learning Outcome 3 Review
Go back to your Learning Outcome grid and fill
out the How I did and the Targets column.
To be able to discuss the above processes in
terms of oxidation and reduction, using symbol
equations.
Learning Outcomes How I did Targets
Learning Outcome 3 Grade A/A I am working at grade .....because ...................................................... I can move up to grade... by
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Review

• Swap books with the person next to you and look
  over their work. Write a WWW and EBI statement.
• Stand up if you have developed some skills this
  lesson? What are they?
• Tell the person next to you three things you have
  learnt this lesson.
• Did you successfully complete tasks at your
  target grade?
• If not, what do you need to do next in order to
  meet your target grade? Record this in your diary
  to be done as part of your extended learning at
  home.
• Is there any part of the lesson you think you
  need to go over again next lesson?
• How will you remember what you have learned today
  for your exam?

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• Demonstration - Using electrolysis to purify
  copper.
• large beaker
• copper sulphate solution
• copper electrodes
• croc clips
• wires
• power pack

• Experiment - The extraction of copper from its
  ore.
• per group
• 250 cm3 beaker
• Bunsen burner
• Crucible and lid
• Heatproof mat
• Pipeclay triangle
• Two spatulas
• Splints
• Stirring rod
• Boiling tube
• Test tube holder
• Test tube rack
• Tripod
• 3g Powdered copper carbonate (Harmful.)
• 0.5g Powdered carbon