Flashcards
Chemistry C2
Cards in this deck (29)
- 1Name a material we use that comes from a plantWood and paper both come from trees
- 2Name a material that comes from an animalWool comes from a sheep
- 3What is the advantage of synthetic rubber over natural rubber?You can control it's properties and make it suitable for different purposes
- 4What's the difference between strength and stiffness?Strength is how good a material is at resisting a force
A stiff material is good at not bending when a force is applied to it - 5What's the hardest material found in nature?Diamond
- 6Define HardnessHow difficult it is to cut into
- 7Define DensityA materials mass per unit volume
- 8Name 2 properties which make plastic useful in manfacturingfairly hard and some are fairly low density
- 9Name 2 properties which make rubber useful in manufacturingstrong but soft and flexible
- 10Name 2 properties which make nylon useful in manufacturingsoft and flexible as well as good tensile strength
- 11what does crude oil contain?formed from buried remains of plants and animals
it is a mixture of hydrocarbons - 12name the two important types of bond in crude oilstrong covalent bonds - between carbons and hydrocarbons within each hydrocarbon molecule
intermolecular forces of attraction - between different hydrocarbon molecules in the mixture - 13why do big hydrocarbon molecules have higher boiling points than small ones?more energy is needed to break out of a liquid into a gas in larger molecules because the intermolecular forces of attraction are much stronger
- 14What happens when crude oil is refined?it produces fuels and lubricants as well as raw materials that can be used to make synthetic chemicals
- 15Name 5 useful products of crude oilPetrol, Kerosene, Diesel, Lubricating oil, Bitumen
- 16What are most of the hydrocarbons in crude oil used to produce?Fuels
- 17What happens during polymerisation?Plastics are formed when lots of small molecules called monomers join together to make a very long molecule called a polymer which are usually carbon based
Under high pressure many small molecules polymerise (join together) to form long chains called polymers - 18Name a product where a polymer has replaced a natural materialSynthetic fibres (nylon and polyester) - cotton, wool or silk
lighter and more durable - 19How does the arrangement of polymer chains affect the density of a material?If polymer chains are packed close together, the material will have a high density
- 20A polymer is easily stretched and has a low melting point What can you say about the arrangement of its molecule chains and the force holding them together?They will have weak forces
- 21What will you add to a polymer to make it stiffer or stronger?Add cross-linking agents
- 22How do plasticisers work?They make the polymer softer and easier to shape by reducing the forces between the polymer chains.
- 23What is nanotechnology?It is the branch of technology dealing with the making and use of nano particles (tiny particles 1-100 nanometers across)
- 24Give 2 examples of uses of nanomaterialsSilver nano particles - added to polymer fibres used to make surgical masks and wound dressings to give them antibacterial properties
Added to plastics in sports equipment to make them a lot stronger and durable - 25Name 2 nano particles that occur naturallySea spray - sea produces nanoscale salt particles
Combustion - when fuels are burnt, nanoscale soot particles are produced - 26What is a products effectiveness?How good it is at the job it's suppose to do
- 27What is the process of making new compounds called?Chemical synthesis
- 28What is tensile strength?How much a material can resist a pulling force
- 29What is compressive strength?How much a material can resist a pushing force
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- GCSE My Science (Chemistry) Flashcards on Chemistry C2, created by laurenleccles on 23/05/2015.
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