Needed for this lesson .
• Class practical (1 set per group)
• Two samples each of magnesium ribbon, iron wool, and copper for burning in
Bunsen flame.
•Blue glass to view magnesium through (2 per group).
•Tongs, Bunsen, heatproof mat and safety specs.
•Matches and wooden splints.
Oxidation.
Starter A.
What has happened to
the objects in the
pictures and why this
has happened?
Starter B.
What chemicals must
be present for this
to happen?
Oxidation and reduction
in a reaction
• Make two sentences.
• One of them will give you the first
key definition for today’s lesson.
Oxidation and reduction
Oxidation is when oxygen is added
Oxidation is ...
to a chemical in a reaction.
Reduction is when oxygen is removed
Reduction is ...
from a chemical in a reaction.
What examples can you remember from last
lesson where chemicals had oxygen added to
them during a reaction?
What happens when metals
react with oxygen?
23/09/2021
• Predict the products formed in
oxidation reactions. (Level 6)
• Explain what happens to the mass of a
metal when it is oxidised. (Level 5)
• Describe what oxidation is. (Level 4)
Oxidation reactions.
?
Hydrogen reacts with oxygen to make water.
H H
H H
+
O

O
H
H
Hydrogen +
2 H2
O
H O H
+
oxygen

water
O2

2 H2O
The same atoms are present at the start
and finish, they have just been rearranged.
Oxidation reactions.
Hydrocarbons reacts with oxygen to make
water
? and carbon ?dioxide.
H
H C H +
H
O
O
O
O

O
H
H
O
H
H
O
+
C
O
Methane + oxygen  water + carbon
dioxide
CH4 + 2 O2  2 H2O + CO2
Same atoms at the start and at the finish!
Practical.
Give yourselves numbers 1-4
• 1’s collect safety goggles.
• 2’s a Bunsen burner, tongs and heatproof mat.
• 3’s collect samples of the three test metals.
• 4’s clear the work space and tuck stools away.
Metal
Observations
Copper
Iron
REMEMBER! Health and Safety.
Magnesium
Product Formed
Oxidation of metals.
You will react magnesium, iron and copper
with the oxygen in the air.
1. Use tongs. Hold a strip of magnesium into a
Bunsen flame. Do not look directly at the strip.
Observe the changes that occur.
2. Use tongs. Repeat with iron wool and copper.
Record what you see in detail.
Pay attention and record what happens to the
appearance of each metal.
Extension: can you figure out the products and
write a word equation for each reaction?
Oxidation of metals.
Word equation for heating metals:
“metal” + oxygen → “metal” oxide
coppercopper + oxygen → copper oxide
iron
iron + oxygen → iron oxide
magnesium + oxygen → magnesium oxide
magnesium
What happens when metals
react with oxygen?
23/09/2021
• Predict the products formed in
oxidation reactions. (Level 6)
• Explain what happens to the mass of a
metal when it is oxidised. (Level 5)
• Describe what oxidation is. (Level 4)
magnesium +
Mg
+
oxygen 
O O

Mg
magnesium
oxide
Mg O
O
2 Mg
+
O2

Mg
2MgO
What happens to the number of atoms overall?
What happens to the mass of the magnesium?
magnesium
+ oxygen
magnesium
oxide
• The reactants have the same type and number
of atoms as the products do.
• The oxygen atoms have bonded to the
Mg
O
magnesium atoms.
• Magnesium oxide is heavier than magnesium.
copper
Cu
Cu
2 Cu
+
oxygen  copper oxide
+
Cu O
O O

Cu
+
O2

O
2CuO
Answer in your books.
L4. What is being oxidised in the image above?
L5. How and why does the mass of copper change?
L6. Write a word equation to show this reaction.
L7. Write a balanced symbol equation as well!
What happens when metals
react with oxygen?
23/09/2021
• Predict the products formed in
oxidation reactions. (Level 6)
• Explain what happens to the mass of a
metal when it is oxidised. (Level 5)
• Describe what oxidation is. (Level 4)
Summarise in depth.
When a bike rusts it becomes heavier.
Discuss in your groups and use scientific
ideas to explain why this is true.