2014106
| Questão | Responda |
| The 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. |
| How are fossil fuels made and how long does it take? | Dead plants and animals sediment for millions of years. |
| Brittle? | It doesn't deform much before it breaks. |
| Ductile? | You can twist and draw this into wires or fibers. |
| Malleable? | Can be squeezed and bent into new shapes without breaking. |
| Plastic? | keeps a new shape when you deform it. |
| 2 properties of rubber. | Durable and soft |
| What do you call it when you put monomers together? | Plasticisers |
| 3 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. |
| High density? | A material has a big mass for its size. |
| Low density? | A material has a small mass for its size. |
| Natural polymers? | Natural polymers include: cotton, silk, wool, rubber, fur, and wood. |
| Man-Made polymers? | Man-Made polymers include: nylon, PVC, polystyrene, polyester, and polythene. |
| What 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. |
| What is crude oil? | Crude oil is a mixture of compounds called hydrocarbons. |
| Fractional 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. |
| what are refineries? | Companies which refine crude oil to make useful products. |
| Why 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. |
| Polymers? | Made up of lots of small molecules joined together called monomers. |
| Polythene? | Ethene is used to make the polymer. |
| Monomers? | small molecules that combine with similar molecules to make polymers |
| Polythene or poly(ethane) is formed by an... | addition reaction |
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