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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. |