Pure metals have orderly arranged, closely packed atoms that give them high density, melting points, and malleability. However, their ductility makes them weak. Alloys are mixtures of metals that are stronger, harder, and more corrosion-resistant than pure metals. Common alloys include bronze, brass, steel, and stainless steel, which are used because of their desirable properties like strength, appearance, and resistance to corrosion.

1. Alloys

2. The Differences Between Pure Metals & Alloys

3. Pure Metals Pure Metals have the following physical properties … High Density. High Melting & Boiling Points. Good Conductors Of Heat & Electricity. Malleable. Ductile. Lustrous.

4. Pure Metals High Density Pure metals is made up of one type of atoms, thus all atoms are of the same size. The atoms in a pure metals are orderly arranged & closely packed together. Orderly arranged & closely packed together

5. Pure Metals High Melting & Boiling Points The forces of attraction between the very closely-packed atoms are very strong, thus a large amount of energy is required to overcome these forces.

6. Pure Metals Ductile Although the forces of attraction of the atoms are very strong, they are not rigid. So, when a force is applied, the layers of atoms can slide over one another. This is why metals are ductile @ can be stretched.

7. FORCE FORCE

8. Pure Metals Malleable The arrangement of atoms in pure metals are not perfect because there are some empty spaces in between the atoms. So, when a metal is knocked @ pressed, groups of atoms may slide & then settle into new positions.

9. FORCE

10. The weakness of pure metals are ... WEAK & SOFT due to their DUCTILITY & MALLEABILITY.

11. Alloys Alloy is a mixtures of two or more elements with a certain fixed composition in which the major component is a metal. Characteristics of alloy are, : Stronger Harder Resistant to corrosion Have a better finish & Lustrous

12. Alloys Why Make Alloys ? To increase the strength and hardness of a pure metal. To increase the resistance to corrosion of a pure metal. To improve the appearance of a pure metal.

13. Composition, Properties, & Uses of alloys

14. BRONZE Composition 90% of copper & 10% of tin. Properties Hard, strong, does not corrode easily & shiny surface.

15. BRASS COMPOSITION 70% of copper & 30% of zinc. PROPERTIES Harder than copper.

16. Cupro-nickel COMPOSITION 75% of copper & 25% of nickel. PROPERTIES Beautiful surface, shiny, hard & does not corrode easily.

17. STEEL COMPOSITION 99% of iron & 1% of carbon. PROPERTIES Hard & Strong.

18. STAINLESS STEEL COMPOSITION 74% Iron, 8% Carbon & 18% chromium. PROPERTIES Shiny, strong & does not rust.

19. DURALUMIN COMPOSITION 93% of aluminium, 3% of copper, 3% of magnesium & 1% manganese. PROPERTIES Light & strong.

20. PEWTER COMPOSITION 96% of tin, 3% of copper & 1% of antimony. PROPERTIES Shiny, strong, & does not corrode.

21. 9-CARAT GOLD COMPOSITION 37.5% of gold, 11% of silver & 51.5% copper. PROPERTIES Shiny, strong, & does not corrode.

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