Alloys contain more than one element, usually a mixture of metals, and are made for specific purposes like car parts, jewelry, and wheel rims. While pure metals have uniformly sized atoms arranged in sliding layers, alloys have atoms of different sizes that get jammed together. This makes alloys harder, stronger, and less ductile or malleable than their constituent metals. An experiment showed that bronze blocks produced smaller dents on average than copper blocks when struck with a weighted ball bearing, supporting the hypothesis that alloys are harder than pure metals.

1. ALLOYS

3. Example of alloy products. Body parts of a car Golden jewelleries Rims

6. Arrangement of atoms in alloys Pure metal A Pure metal B

13. Results 2.5 2.3 2.5 2.4 Brass 3.2 3.3 3.1 3.2 Copper Average 3 2 1 Diameter of dents (cm) Blocks

16. 2. Steel is harder than pure iron. This is because the atoms of steel are … A. more difficult to compress. B. More compact. C. More difficult to slide over one another. D. Smaller but heavier.

17. 2. Which of these are the properties of alloys? A. Ductile. B. Malleable. C. Ductile and malleable. D. Not ductile and not malleable.

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