(3) Quantitative chemistry

• What is the equation for metals+water? (eg na)

  2Na + 2H2O -> 2NaOH + H2
• What is the equation for reacting an acid with a metal (eg Mg)

  Mg + 2HCl -> MgCl2 + H2
• What is the equation for reacting an acid with a metal oxide? (eg CuO)

  CuO + 2HCL -> CuCl2 + H2O
• Give the equation for the combustion of carbon

  C +O2 -> CO2
• Give the equation for the combustion of hydrogen

  H2 + O2 -> 2H2O
• Give the equation for the combustion of hydrocarbons (eg methane)

  CH4 + O2 -> CO2 + H2O
• How do you calculate energy changes?

  total energy needed to break bonds - total energy released when bonds in the products are formed
• How do you calculate rate of reaction?

  quantity of reactant used/time taken
• How do you calculate mean rate of reaction?

  quantity of product formed/time taken
• How many cm3 are in 1dm3?

  1000 cm3
• How do you calculate % yield?

  (mass made/theoretical mass) x 100
• give concentration equation in mol/dm3

  moles/volume
• 1 mole of gas has a volume of what?

  24 dm3
• Give volume equation for a gas.

  moles x 24dm3
• What is avagadros number?

  6.03x10^23 particles in 1 mole
• Give equation for moles

  mass / Mr
• Give concentration equation in g/dm3

  mass/volume