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10 Cards in this Set
- Front
- Back
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what is cracking and why is it necessary |
cracking- this is when a large akane is turned into a saller alkane and alkene, you can crak it into smaller, more useful hydrocarbons |
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describe the process of cracking |
the alkane is heated up to form a gas and passsed over a catalyst |
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what is an alkene |
alkenes are hydrocarbons(made up of carbon and hydrogen) with a carbon- carbon double bond (C=C) |
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what is the general formula for an alkene |
they have the general formula CnH2n (2 hydrogens for every carbon) |
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what happens when alkenes react with bromine water |
bromine water is brown. alkenes make it olourless alkanes do not change the colour (it stays brown) |
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describe the process of polymerisation |
monomers are passed at high temperatures over a catalyst. the double bonds opens up and forms a polymerchain made of the monomer. |
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what uses do we have for plymers |
polymer typical use polythene plastic bags and bottles polypropene crates and ropes polychloroethene water pipes and insulation on electricity ables |
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why it is important to recycle polymers |
they are made from crude oil which is non renewable. |
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what are biodegradeable plastics |
plastics that break down easily. Corn startch are built into the plastic. Micro-organisms in soil feed on corn startch. thia breaks the plastic down. |
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Name and descrbe 3 smart polyers. |
Light sensitive plasters-ntoplayer of plaster peeled back. lower layer now exposed to light. adhesive loses stickiness, peels easily off the skin. hydrogels- have crss linking chains hat traps water. Act as wound dressing. Let body heal. Good for burns. shape memory- Wound is stitched loosely. Temp of the body makes the thread tighten. closes the wound up. |
