Chemical Reactions

• Total mass of reactants and products in a chemical reaction is the same (conservation of mass)
• reactants

  Two or more substances which react together to create a product
• Rusting


  A form of corrosion that applies specifically to iron (or steel)
• Conditions required for rusting


  Air/oxygen and water
• How lubrication can prevent a metal from rusting


  Prevents the air/oxygen and water coming into contact with the metal
• Possible types of lubrication?


  Paint, grease, plastic etc.
• Acids have a pH less than 7, while alkalis have a pH greater than 7.
• A solution with a pH of 7 is neutral (pure water).
• Why is rusting of iron and steel a problem?

  Corrosion