Karteikarten
C2 Revision
Karten in diesem Stapel (16)
- 1Synthetic MaterialsNylon, PVC, Polystyrene, Polyester, Polythene
- 2Natural MaterialsRubber, Cotton, Wood, Paper, Wool, Silk, Leather
- 3Strength: Tensile and CompressiveHow good a material is at resisting a force
Tensile Strength (Tension): Resist a pulling force- ropes or cables need a high tensile strength
Compressive Strength: Resist a pushing force- bricks need good compressive strength or they'd be squashed - 4Melting PointThe temperature where the solid material turns to liquid
- 5StiffnessNot good at bending when a force is applied to it
A bendy material can still be strong if a big force doesn't permanently deform it
- Steel is hard to bend - they're stiff
- Some rubber is very strong but they bend and stretch easily - 6HardnessHow difficult it is to cut into the material
- The hardest material found in nature is diamond
- The only material that can cut a diamond is another diamond - 7DensityDensity is a material's mass per unit volume
- Air is not very dense, you need a huge volume of it to make up 1kg in mass
- Gold is very dense, a small volume of gold would make up 1kg in mass
- Objects less dense than water will float (like ice)
- Objects more dense than water will sink (rocks) - 8PolymersLong chained molecules made up of smaller molecules called monomers
- 9Crude OilCrude Oil is a large mixture of various- sized HYDROCARBONS
- 10Fractional DistillationThe Process of separating Crude Oil
- 11HydrocarbonHydrogen and Carbon ONLY
- 12Adding Cross LinksLess Cross Links - Weaker
More Cross Links - Stronger
Hard, Strong, Rigid, High Melting Point
Cross Link prevent polymer chains from sliding over one another - 13Changing Chain LengthLong Chains - Get tangled up, Stronger, Harder, Tangled, Longer the Stronger
Short Chains - Weak, Soft - 14Adding PlasticisersSofter, Flexible
- Potential health risks as plasticisers can leak out
- Plasticisers act as oil droplets between the polymers chain which allows them to easily slide over one another - 15Changing Density/ CrystallinityHigh Density: Rigid, Brittle, Strong, Brittle, High Melting Point, Hard - Crystalline (Ordered, regular, arrangement of molecules)
Low Density: Malleable, Weak, Flexibility, Low Melting Point - Side Branches prevent the polymer chains from packing together - 16Nanotechnology 1 Nm = 0.000 000 001 mReally tiny particles
Nanotechnology is the branch of technology dealing with the making and use of these nano particles
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- GCSE Science (Chemistry ) Karteikarten am C2 Revision , erstellt von Hannah Farbon am 26/02/2014.
- Erstellt von
- Hannah Farbon
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