C7: Metals Flashcards Preview

Chemistry iGCSE > C7: Metals > Flashcards

Flashcards in C7: Metals Deck (18):
1

Test for Hydrogen

Squeaky 'pop' test

2

A more reactive metal...

...Will displace a less reactive metal from an aqueous solution of one of its salts.

3

Ionic Equations

An equation that shows only those ions or atoms that change in a chemical reaction.
Mg + CuSO4 -> MgSO4 + Cu
Mg + Cu2+ -> Mg2+ + Cu

4

Redox Reactions

The gain and loss of electrons

5

2 ways of extracting metal from metal ore?

Displacement with carbon
Electrolysis

6

Pure Metal Atomic Structure

> Organised in closely packed, regularly set out layers.
> Contain a sea of free moving, delocalised electrons.
> When heated, soft and easily shaped because the layers can easily slip over each other.

7

Why are alloys harder than the pure metals that they are made of?

Because they usually have controlled amounts of carbon mixed into their structure, which disrupts their regular layout and prevents the layers from sliding over one another.

8

How are metals held together?

Through stron electrostatic attraction between the free electrons and the positively charged ions.

9

Shape Memory Alloys

Mixture of metal which responds to changes in temperature.

10

Properties of copper.

> bendable but strong
> very conductive.

11

Bronze =

Copper + Tin
Tough and non-corrosive

12

Brass =

Copper + Zinc
Hard

13

Aluminium alloys are...

Lightweight but strong, used for aircrafts, armoured tanks etc.

14

Blast Furnace

The huge reaction vessels used in industry to extract iron from its core.

15

Components of a blast furnace and their jobs.

> iron ore (haematite)
-iron oxide
-a compound that contains iron
> coke
-carbon
-burns in air to produce heat, and reacts to form carbon monoxide (needed to reduce the iron oxide)
> limestone
-calcium carbonate
-helps to remove acidic impurities from the iron by reacting with them to form molten slag
> air
-oxygen
-allows the coke to burn, and so produces heat and carbon monoxide

16

Carbon Steels

Alloy of iron containing controlled, small amounts of carbon.

17

High-Alloy Steels

Expensive alloy of Iron mixed with a relatively large proportion of other metals.

18

Low-Alloy Steels

Alloy of Iron containing between 1-5% of other metals.