Metals
- Created by: beth
- Created on: 31-12-12 15:32
View mindmap
- METALS
- RECYCLING
- ADVANTAGES
- Only uses a SMALL FRACTION of the ENERGY needed to mine/ extract a new metal
- SAVES MONEY
- REDUCES LANDFILL
- DISADVANTAGES
- MINING and EXTRACTING takes a lot of ENERGY
- FOSSIL SUELS are running out so its important to CONSERVE them
- Burning fossil fuels comtributes to ACID RAIN, GLOBAL DIMMING and CLIMATE CHANGE
- ADVANTAGES
- PROPERTIES OF METALS
- TRANSITION METALS are GOOD CONDUCTORS of HEAT and ELECTRICITY. They can also be BENT/ HAMMERED into shape. They are useful as STRUCTUAL MATERIALS
- COPPER
- Good CONDUCTOR of ELECTRICITY
- HARD and STRONG but can be BENT
- DOESN'T REACT with WATER
- ALUMINIUM
- CORROSION RESISTANT
- LOW DENSITY metal
- PURE aluminium ISN'T strong but forms HARD, STRONG ALLOYS
- TITANIUM
- CORROSION RESISTANT
- LOW DENSITY metal
- Very STRONG
- ALLOYS
- A mixture of two or more ELEMENTS where at least one METAL is an ALLOY
- ALLOYS are used because PURE ELEMENTS aren't always right for certain jobs
- IRON from a BLAST FURNACE is around 96% IRON and 4% IMPURITIES (i.e. CARBON
- Because the ARRANGEMENT of the iron ATOMS is REGULAR, the slide over each other, making the iron SOFT and EASILT SHAPED. This is TOO BENDY for most uses
- Iron is changed into STEEL ( an ALLOY), which is formed by adding small amounts of CARBON (and sometimes other metals) to the iron
- STEEL
- Low carbon steel (0.1% carbon) - Easily shaped- used for car bodies
- High carbon steel (1.5%carbon)- Very hard, inflexible- Used for blades/ bridges
- Stainless Steel (Chromium and Nickel)- Corrosion resistant- used for cutlery/ sinks
- RECYCLING
Comments
No comments have yet been made