Finishing chemistry
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Finishing chemistry

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This presentation covers are few things we (8A and 8C) need to review to finish the current Chemistry unit.

This presentation covers are few things we (8A and 8C) need to review to finish the current Chemistry unit.

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Finishing chemistry Finishing chemistry Presentation Transcript

  • Solids Liquids and GasesIf you would like to reviewthis, please go here;http://exploration.grc.nasa.gov/ed
  • Cations and AnionsA positive ion is called a cation. eg.__________A negative ion is called an anion. eg ____________
  • In order to react particles need to collide.A certain amount of energy is necessary for a reaction to take place. This is called the activation energy. http://www.talktalk.co.uk/reference/encyclopaedia/hutc
  • Reaction RatesFour things can speed up the rate of a reaction:Increasing the surface area. _____________________________________Increasing the concentration. _____________________________________Increasing the temperature. ______________________________________Using a catalyst This lowers the activation energy required.
  • Chemical and Physical ChangeIn a chemical change, new substances are formed.Evidence of a chemical change includes light and heat being given off, and something changing colour (ie becoming a new substance).A chemical change cannot easily be changed back.In a physical change, no new substances are made, so they can be more easily changed back.
  • OxidationAn oxidation reaction occurs when something reacts with oxygen. Eg: iron (III) + oxygen --> iron (III) oxide.
  • CombustionA combustion reaction is when something burns. eg. Hydrogen + Oxygen --> ___________The substance which burns reacts with oxygen in the air (O2).Most combustion reactions are exothermic (give off heat). Many also give off light.All combustion reactions are oxidation reactions (but not vice versa).
  • ReductionA reduction reaction occurs when something loses oxygen. It is the opposite of an oxidation reaction.eg.iron oxide + carbon --> iron + carbon dioxide.
  • Please Bring a Ruler to the Exam!