Amount of Substance

• Define relative atomic mass?

  weighted mean mass of an atom of an element compared to 1/12 mass of an atom of carbon-12
• Define relative molecular mass?

  weighted mean mass of a molecule compared to 1/12 mass of an atom of carbon-12
• Define relative formula mass?

  weighted mean mass of a formula compared to 1/12 mass of an atom of carbon-12
• What are forces between an ion and a dipole called?

  Ion dipole forces
• Define water of crystallisation?

  Water molecules that are part of the lattice of a solid salt
• How do you turn a hydrated salt into an anhydrous salt?

  vigorously heating
• Name 2 uses of anhydrous salts?

  test for water

  drying reagents
• What is the ideal gas equation?

  pV=nRT
• What does p stand for in the ideal gas equation?

  pressure
• What does V stand for in ideal gas equation?

  volume
• What does n stand for in ideal gas equation?

  number of moles
• What does R stand for in ideal gas equation?

  gas constant
• What does T stand for in ideal gas equation?

  Temperature
• What is the unit of pressure in ideal gas equation?

  pascals (Pa)
• What is the unit of volume in ideal gas equation?

  $m^3$
• What is the value of gas constant in ideal gas equation?

  8.31
• What is the unit of Temperature in ideal gas equation?

  Kelvin
• What happens to the volume of a gas as the number of particles increases? ( when other conditions constant )

  increases
• What happens to the volume of a gas as the temperature of gas increases? ( when other conditions constant )

  increases
• If temperature is increased and volume is constant what happens to pressure?

  increases
• If volume is increased and amount of particles is constant what happens to pressure?

  decreases
• What happens to volume as the amount of particles increases?

  increases
• Suggest a reason for stoppering the flask?

  so no water evaporates
• Suggest a reason why solution is kept until no more solid needs to be added?

  to create a saturated solution