Results are in... 90% of Mr Gundry's students achieved a grade between A*-C! How'd you do? :)

C1 Metals and Their Uses

← Back To Topics
Metals and Their Uses
Topic Quiz

Keywords

Ore

A rock containing enough metal to make extraction economically viable/achievable.


Conductor

Has low resistance, allowing an electrical current/thermal energy to pass through it easily.

Reduction

The removal of oxygen from a compound. Also can refer to when electrons are added to an element/compound.


Malleable

When a metal can be hammered, or pressed into a shape without breaking.


Ductile

When a metal can be drawn into wires.

Methods of Extraction

Metals are found within the Earth's crust. They need to be extracted before they can be used.

The least reactive metals can be found natively as they are unreactive.

The reactivity series of metals compared to carbon and hydrogen. Also there is information on how they are extracted.

Transition Metals

These elements are found between Group 2 and 3 on the Periodic Table. Most of the elements on the table are metals, and most metals are transition metals.


They all share some common properties that mean they are: good conductors of heat and electricity, malleable, ductile, shiny, sonorous and strong.

The Periodic Table of Elements

Iron Extraction

Iron is extracted using a blast furnace. The most common ore of iron is iron(III) oxide, also known as haematite. The ore is reduced, using carbon, to produce iron.

iron oxide + carbon --> iron + carbon dioxide

Word equation to show the reduction of iron using carbon

In a blast furnace, it is so hot that carbon monoxide can also cause reduction:

iron oxide + carbon monoxide --> iron + carbon dioxide

Word equation to show the reduction of iron using carbon monoxide
A Blast Furnace

Copper Extraction

Copper isn't very reactive, but is reactive enough to be found in ores. These compounds have a high concentration of copper which can be extracted by smelting. It is then purified by electrolysis.


One copper ore is called chalcocite, and contains copper(I) sulfide. It can be thermally decomposed to produce copper, but also makes sulfur dioxide (causes acid rain).

A diagram showing all the information related to the electrolysis of copper sulfate to extract copper metal.

Phytomining

Some plants take up copper compounds through their roots, and a large concentration of copper can build up in the plant. These plants can be burned to extract the copper.


Bioleaching

Some bacteria absorb copper compounds. A similar process to above can be completed, to extract the copper.


Scrap Iron

Because iron is more reactive than copper, iron can be used to displace copper from copper(II) sulfate.


Aluminium & Titanium

These metals are both strong, but an added bonus is they are less dense than other metals. They are also resistant to corrosion, making these metals very useful.


Aluminium is extracted by electrolysis as it's more reactive than carbon, so cannot be displaced. Electrolysis is very expensive as we need high temperatures to melt the metal compound.


Titanium could be extracted using carbon, if it did not react with it to make a brittle compound. Sodium/magnesium are used to extract instead, but these must be extracted using electrolysis first.

A diagram showing the different uses of aluminium

Iron and Steel

Pure iron is soft and malleable, as its atoms have a regular layer arrangement. These layers can easily slide over each other, and makes pure iron too soft for many uses.

Metals can be bent, or hammered, into shape as they have regular layers which can slide over each other.

Iron from a blast furnace contains about 4% carbon, and it is too brittle for most uses. This 'pig iron' is then turned into steel by removing some carbon. The carbon is removed from molten 'pig iron' by blowing oxygen through it, making carbon monoxide and carbon dioxide. Other metals can be added to make alloys with specific uses:


Low carbon steel - easily shaped - used for car body panels

High carbon steel - quite hard - used for cutting tools

Stainless steel - resistant to corrosion (chromium-nickel) - used for cutlery


Alloys

When a metal is mixed with other element(s) they form an alloy. Alloys have different sized atoms, which means the layers are distorted. They cannot easily slide over each other, and so make a harder material than the pure metal.

An alloy has an irregular layer pattern making it harder than a pure metal.

Useful Alloys

Copper

Bronze (copper and tin) is tough and resistant to corrosion. Brass (copper and copper and zinc) much harder than copper, and can be hammered into shapes.


Aluminium

Duralumin (aluminium, copper, and other metals) is used in aircrafts.


Gold

18 carat gold (75% gold, 25% copper and other metals) is used for jewellery.

A table containing various alloys and their properties

← Back To Topics
Metals and Their Uses
Back to top

Page last updated: 16/04/2017