Chemical reactions

• How can you represent a reaction?

  Word equations
• Where are the reactants placed on a word equation?

  Left
• Where are the products placed on a word equation?

  Right
• What might you notice if a chemical reaction is happening?

  flames or sparks, smell, fizzing, temperature changing
• What can you add to speed up a reaction?

  Catalyst
• What do all chemical reactions involve?

  An energy transfer to or from the surroundings
• What is it called when the temperature of the surroundings decrease?

  Endothermic reaction
• What is it called when the temperature of the surroundings increase?

  Exothermic reaction
• What happens to atoms in a reaction?

  Rearrangement
• What is a change of state reaction called?

  Physical change
• What is a decomposition?


  When a substance breaks down into simpler substances
• What do most decompositions need to work?

  heat
• What is oxidation?


  When substances react with oxygen
• What is combustion?


  Combustion is a chemical reaction that occurs when a fuel combines with oxygen to produce heat, light, and new chemical compounds.
• What does non-renewable mean?

  Limited resources that cannot be replaced
• What do fossil fuels produce?

  carbon dioxide and water when combusted
• What is conservation of mass?

  Total mass of reactants = total mass of products