Chemistry

• Combustion


  The scientific word for burning
• Oxidation


  The process of which oxygen is added
• Components of the fire triangle

  • Oxygen
  • Heat
  • Fuel
• Air pollution


  A mixture of solid particles and gases in the air
• Global warming


  The gradual increase in the average temperature of earth
• Causes of air pollution

  • Car emissions
  • Fossil fuels being released from factories
  • Power plants
• Describe oxidation reactions of metals


  Magnesium, iron
• Describe oxidation reactions of non-metals

  Carbon, sulfur
• State what happens to mass in a chemical reaction

  The mass stays the same
• Describe what is meant by exothermic reactions

  Reactions that give out heat
• What problems can air pollution cause?

  Stroke, trachea, lung cancer etc.
• How can air pollution be controlled?

  Using cars less, use less energy, stop releasing harmful chemicals into the air etc.
• Describe the formation of acid rain and explain its effects on organisms and bodies of water

  Harmful gases are released, the gases dissolve into water vapour, the rain is more acidic than normal, overtime it harms plants and statues etc.
• What is the greenhouse effect?

  the process where heat is trapped near Earth's surface by substances.
• How do humans contribute to global warming?

  Burning fossil fuels, cutting down forests and farming livestock
• Properties of metals

  • Good conductors of heat
  • Solid
  • Shiny
• Reactions of metals with water

  1. Metal hydroxide formed

  2. Hydrogen formed
• Reactions of metals with acid

  Salt hydroxide formed
• Reactivity series

  A series that shows the relative reactivity of metals
• Corrosion

  When a metal continues to oxidise
• Rust

  A type of corrosion
• Element


  Something made up of only one kind of atom
• Compound


  Something made up of more than one kind of atom that are chemically bonded together
• Physical change


  A change that can be reverted
• Chemical change


  A change that cannot be easily reversed