definitions

• physical change

  change of state which is reversible
• melting point


  temperature which a substance melts
• boiling point

  temperature which a substance boils
• sublimation (important)

  when a solid changes into a gas without becoming a liquid
• deposition

  when a gas changes into a solid without becoming a liquid
• pure substance

  substance made of one type of particle
• mixture

  physically combining 2 or more elements that can easily separate
• insoluble

  substance that doesn't dissolve
• soluble

  substance that does dissolve
• solute

  name for the solid that dissolves
• solution

  mixture of the solute and solvent
• solvent

  liquid that dissolves the solute
• filtrate

  solution left after filtration
• saturated solution

  solution that won't dissolve any more solute particles
• residue

  solid left in the filter paper after filtration
• paper chromatography

  method used to separate coloured substances
• mobile phase

  solvent that absorbs the paper in chromatography
• stationary phase

  the paper in chromatography
• chromatogram

  the results from chromatography
• Rf value (important)

  solubility measurement

  distance spot moves/distance solvent moves
• distillation

  separating a mixture using boiling points
• desalination

  removal of salt from sea water using evaporation
• aquifer

  underground rocks containing groundwater
• sedimentation

  small particles settling down
• chlorination

  adding chlorine to kill bacteria
• compound

  chemically combining 2 or more elements