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C1 Glossary AW
Glossary of key words for C1- Carbon Chemistry
| Term | Definition |
|---|---|
| Addition polymer | A very long molecule resulting from polymerisation, e.g. polythene. |
| Alkanes | A family of hydrocarbons found in crude oil with single covalent bonds, e.g. methane. |
| Alkenes | A family of hydrocarbons with one double covalent bond between carbon atoms, e.g. ethene. |
| Balanced symbol equation | A symbolic representation showing the kind and amount of the starting materials and products of a reaction. |
| Biodegradable | A biodegradable material can be broken down by microorganisms. |
| Bitumen | Thick tar-like substance that does not boil in a fractionating column. |
| Boiling point | Temperature at which a liquid turns into a gas. |
| Breathable fabric | Gore-tex like material that allows water vapour to escape. |
| Bromine | Orange substance used to test for alkenes. A liquid corrosive halogen. |
| Butane | An alkane of 4 carbon atoms, part of LPG. |
| Carbon cycle | A natural cycle through which carbon moves by respiration, photosynthesis and combustion in the form of carbon dioxide. |
| Carbon dioxide | Gas present in the atmosphere at a low percentage but important in respiration, photosynthesis and combustion. |
| Carbon footprint | The total amount of greenhouse gases given off by a person in given time. |
| Carbon monoxide | Poisonous gas made when fuels burn in a shortage of oxygen. |
| Catalyst | Substance added to a chemical reaction to alter the speed of a reaction- it is not used up during the reaction. |
| Catalytic converters | Boxes fitted to vehicle exhausts which reduce the level of nitrogen oxides and unburnt hydrocarbons in the exhaust fumes. |
| Colloid | A liquid with small particles dispersed throughout it, forming neither solution nor sediment. |
| Combustion | Process where fuels react with oxygen to produce heat. |
| Complete combustion | When fuels burn in excess of oxygen to produce carbon dioxide and water only. |
| Covalent bond | Bond between two atoms where and electron pair is shared. |
| Cracking | The process of making small hydrocarbon molecules from larger hydrocarbon molecules using a catalyst. |
| Cross links | Links between two adjacent polymer chains that stop the movement of the molecules, which makes the plastic more rigid. |
| Crude oil | Black material mined from the Earth from which petrol and many other products are made. |
| Decolourise | Turn from a coloured solution to a colourless solution. |
| Decomposes | Chemically broken down. |
| Deforestation | Removal of large areas of trees. |
| di-Bromo compound | Colourless compound resulting from an alkene and bromine solution. |
| Dispersion | Particles spreading out in a colloid. |
| Displayed formula | When the formula of a chemical is written showing all the atoms and all the bonds. |
| Disposal | Getting rid of unwanted substances such as plastics. |
| Double covalent bond | Covalent bond where each atom shares two electrons with the other atom. |
| Ethene | An alkene containing 2 carbon atoms, it is produced during the process of cracking. |
| Finite resource | Resources, such as oil that will eventually run out. |
| Fossil fuels | Fuels such as coal, oil and gas. |
| Global warming | The increase in the Earth’s temperature due to increases in carbon dioxide levels. |
| Greenhouse gas | Any of the gases whose absorption of infrared radiation from the Earth’s surface is responsible for the greenhouse effect, e.g. carbon dioxide, methane, water vapour. |
| Infrared waves | Non-ionising waves that produce heat- used in toasters and electric fires and given off by the surface of the Earth to warm the atmosphere. |
| Melting point | Temperature at which a solid turns into a liquid. |
| Non-renewable energy | Energy which is used up at a faster rate than it can be replaced, e.g. fossil fuels. |
| Renewable energy | Energy that can be replenished at eh same rate that it’s used up, e.g. biofuels. |
| Temperature | A measure of the degree of hotness of a body on and arbitrary scale. |