Science C1

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Science C1
2015-02-20 08:02:21
Science C1
Science C1
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  1. Gas
    A state of matter characterized by no definite shape or volume.
  2. molecule
    a small group of atoms held together by covalent bonds
  3. fossil fuel
    fuel such as coal, oil or gas that was formed millions of years ago by plant and animal remains
  4. sedimentary
    rock type, made up of layers created over hundreds of years, formed by pressure.
  5. sediment
    tiny particles like sand that are deposited on the ocean floor.
  6. carbon monoxide (CO)
    a lethal, odourless gas that results from the incomplete combuction of carbon and its compounds
  7. nitrogen oxide
    gaseos molecules containing nitrogen and oxygen atoms according to the formula NOx . these pollutants are formed due to the high temperatures created by the combustion of fossil fuels.
  8. sulphur dioxide
    pollutant gas released from burning sulphur- containing fuels, which cause acid rain.
  9. Particulate
    a tiny bit of a solid
  10. pollutant
    harmful substance in the environment
  11. correlation
    being able to draw a conclusion form two variables in a set of data, how one effects the other.
  12. smog
    air pollution that is caused, for example by fossil fuels being burned
  13. acid rain
    contains quantities of carbonic, nitric and sulfuric acids
  14. Hydrocarbons
    Organic compounds consisting of only carbon and hydrogen.
  15. hydrocarbon + oxygen
    water + carbon dioxide
  16. Oxidation
    The loss of electrons by a substance. Biological oxidation may involve the addition of oxygen or the loss of hydrogen.
  17. reduction
    the process of electron gain
  18. combustion
  19. Reactants
    The chemical formula to the left of the arrow represent the starting substances.
  20. Products
    The substances formed as a result of a chemical reaction.
  21. Element
    Substance that cannot be decomposed into simpler substances
  22. molecule
    a small group of atoms held together by covalent bonds
  23. Conservation of mass
    the total mass of chemicals are the same at the end of a reaction as at the beginning. No atoms are created or destroyed and so no mass is gained or lost
  24. Compound
    A pure substance consisting of two or more elements, with a definite composition, that can be broken down into simpler substances by chemical methods.
  25. flue gas desulphurisation
    industrial process whereby sulphur is removed from a waste gas
  26. biofuel
    fuel produced from renewable plant material (biomass)
  27. sustainable
    resource or process that will still be used in future generations
  28. Catalyst
    A substance that increases the rate of reaction by lowering the activation energy.
  29. catalystic converter
    a device fitted to vehicle exhausts to reduce the level of nitrogen oxides and unburnt hydrocarbons emitted.