Topic 4 - Obtaining And Using Metals Flashcards Preview

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Flashcards in Topic 4 - Obtaining And Using Metals Deck (20)
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1

Metals that react to form compounds are found naturally in

The earths crust

2

If a compound contains enough of the metal to make it worthwhile extracting it's called

A metal ore

3

Metal ores are a

Finite resource - limited amount

4

The more reactive a metal is

The harder it is to extract from a compound

5

Metals react with oxygen to form oxides. What is this process called?

Oxidation

6

A reaction that separates a metal from its oxide is called a

Reduction reaction

7

Methods of extraction are linked to

The order of reactivity

8

Only metals that are less reactive than carbon can be extracted by

Reduction reaction with carbon - this is done by heating the ore with carbon

9

Very reactive metals form

Very stable ores

10

Elements that are more reactive than carbon have to be extracted using

Electrolysis

11

Electrolysis uses electricity to

Separate the metal from the other elements in the compound

12

What are typical properties of metals

- strong but can be bent
- conductors of heat
- conduct electricity well

13

What are the properties of aluminium

- low density
- corrosion resistant
- pure aluminium isn't particularly strong but can form hard alloys
- useful structural material
- can be used for window frames, electricity cables, aircraft

14

What are the properties of copper?

- hard/strong
- high melting point
- good conductor of electricity
- useful for electrical wires or pipes

15

What are the properties of gold?

-shiny
- easy to shape
- used for jewellery or anything where you need a metal that won't react with anything e.g tooth fillings Or in electrical circuits

16

Corrosion in metals occurs because of

Metals being oxidised

17

Allots are harder than pure metals because

- different elements have different sized atoms
- if a different element is added to a metal, the smaller atoms will upset the layers of pure metal atoms and make it more difficult for them to slide over each other

18

Smart alloys have a

Shape memory ( they return to their original shape)

19

An example of a smart alloy is

Nitinol (alloy of nickel and titanium)

20

Metals that are Unreactive don't tend to form

Compounds