1. What do these have in common?

2. Learning Outcomes
ALL will be able to state what is meant by an alloy (level 4)
MOST will be able to describe uses of some alloys (level 5)
SOME will be able to explain why an alloy can be stronger than a pure metal (level 6)

3. Literacy in Science
Alloy
Properties
Elements
Mixture

4. ‘rose gold’- copper and gold
What is an alloy? (LO1)
An alloy is a mixture of at least two elements, where at least one of these is a metal
‘rose gold’- copper and gold

5. What is an alloy? (LO1)
New, more useful materials can be created in this way
Alloys have a mixture of the properties of the original elements
‘Birmabright’- aluminium and magnesium

6. Brass is formed from copper and zinc and is much stronger than both
Useful alloys (LO2)
Brass is formed from copper and zinc and is much stronger than both

7. Pewter is formed from tin and lead
Useful alloys (LO2)
Pewter is formed from tin and lead

8. Useful alloys (LO2) Cast iron is an alloy of iron and carbon
It has a lower melting point than iron and flows well

9. Stainless steel is an alloy of iron, chromium and nickel
Useful alloys (LO2)
Stainless steel is an alloy of iron, chromium and nickel

10. Why are they so strong? (LO3)
layers of atoms in a metal
layers of atoms in an alloy

11. What level am I working at?
Level 4: recall, state, list
Level 5: describe, recount
Level 6: explain, compare, contrast, apply, analyse, evaluate

12. Peer Assessment Fill the Gap
alloy; properties; stronger; rust; mixed; stainless; pure; layers; can; cannot; more
LEVEL 4

13. Peer Assessment
‘An alloy is a mixture of at least two elements, where at least one of these is a metal’
LEVEL 4

14. Peer Assessment 2. Example: Birmabright
Made from aluminium and magnesium
Used for the body of Land Rovers
LEVEL 4-5

15. Peer Assessment 3. Example:
‘Birmabright is more suitable for its purpose than either of its constituent elements, magnesium and aluminium, because it is stronger and lighter than either.’
LEVEL 5

16. Peer Assessment
4a. Malleable = capable of being shaped or formed (e.g. by hammering)
LEVEL 4

17. Peer Assessment
4b. The larger atoms/ particles in the alloy prevent the smaller ones from forming layers as well, which means they can’t slip as easily when a force is applied.’
LEVEL 6

18. Quiz!

19. Question One Is an alloy: a. A mixture of two metals
b. A mixture of two or more elements, one of which is a metal
c. A metal element
d. A compound of two non- metals

20. Question Two 2. Which of these is an alloy? a. Wood b. Aluminium
c. Plastic
d. Cast iron

21. Question Three 3. Do alloys have?
a. The same properties as one of the original elements
b. A mixture of properties of the original elements
c. Completely different properties to the original elements

22. Question Four 4. The alloy brass is a mixture of which two metals?
a. Copper and zinc
b. Copper and aluminium
c. Zinc and iron
d. Oxygen and sulphur

23. Question Five
5. Which of these properties makes cast iron useful for creating intricate shapes?
a. Rigid
b. Can be recycled
c. Nice colour
d. Flows well