Paper 2

• Activation energy


  The minimum amount of energy that particles must collide with to react
• Catalyst


  -increase rate of reaction

  -not used in reaction
• Collision theory


  Chemical reactions only occur when reacting particles collide with each other and sufficient energy
• Equilibrium of a reaction


  when the forward and reverse reactions occur at exactly the same rate
• Rate of reaction


  the measure of the amount of product formed or reactant used over time
• Cracking


  a process that involves breaking down large hydrocarbons to produce smaller more useful molecules
• Fractional distillation


  a method of separating a mixture of substances according to their different boiling points (mostly used for crude oil)
• Hydrocarbon


  molecules made of hydrogen and carbon atoms ONLY
• Stationary phase of chromatography


  the chromatography paper (it doesn't move)
• Rf value


  the ratio of distance travelled by colour to distance travelled by solvent
• Carbon footprint


  total amount of carbon dioxide and other greenhouse gases emitted over the full life cycle of a product
• Greenhouse effect


  the increase in temperature of the Earths atmosphere due to greenhouse gases trapping infra-red radiation from the sun
• Photosynthesis


  Carbon dioxide + Water ————)

  Glucose + Oxygen
• Alloy


  a metal compound made by combining two or more metals together
• Displacement


  When a more reactive element displaces a less reactive one in a chemical reaction
• Electrolysis


  The splitting up of an ionic compound using electricity which causes chemical reactions at the electrodes
• Life Cycle Assessment


  Recourses —-) Processing —-) Manufacturing —-) Distribution —-) Use —-) End of life
• Ore


  A rock which metal can be extracted from
• Renewable resources


  A natural resource that can be used repeatedly and wont run out