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GCSE Core Science - Chemistry 2 revision cards
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- 1The melting point of chocolate is 30'C, whereas the melting point of plastic is around 200'C. Why is it so much higher than chocolate?It is more dense and there are stronger forces between molecules.
- 2How are fossil fuels made and how long does it take?Dead plants and animals sediment for millions of years.
- 3Brittle?It doesn't deform much before it breaks.
- 4Ductile?You can twist and draw this into wires or fibers.
- 5Malleable?Can be squeezed and bent into new shapes without breaking.
- 6Plastic?keeps a new shape when you deform it.
- 72 properties of rubber.Durable and soft
- 8What do you call it when you put monomers together?Plasticisers
- 93 ways of disposing of waste like plastic is melting it, binning it or recycling it. Which one is worst for the environment and why?Melting it because it releases bad fumes into the air.
- 10High density?A material has a big mass for its size.
- 11Low density?A material has a small mass for its size.
- 12Natural polymers?Natural polymers include: cotton, silk, wool, rubber, fur, and wood.
- 13Man-Made polymers?Man-Made polymers include: nylon, PVC, polystyrene, polyester, and polythene.
- 14What can crude oil be used for?Crude oil is used for fuels, lubricants so machinery can run smoothly, and also used to make new chemicals such as plastics, nylons, polyester, and cosmetics.
- 15What is crude oil?Crude oil is a mixture of compounds called hydrocarbons.
- 16Fractional Distillation?the act of separating crude oil into its different hydrocarbons. This process separates the hydrocarbons into substances with different boiling points. These substances are called fractions.
- 17what are refineries?Companies which refine crude oil to make useful products.
- 18Why is crude oil of little use without refining it?It is toxic and all the hydrocarbons mixed together need to be separated before it is useful.
- 19Polymers?Made up of lots of small molecules joined together called monomers.
- 20Polythene?Ethene is used to make the polymer.
- 21Monomers?small molecules that combine with similar molecules to make polymers
- 22Polythene or poly(ethane) is formed by an...addition reaction
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- Some quick revision cards on things needed to know for the GCSE Core Science exam
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