GCSE Chemistry

Subdecks (2)

Cards (56)

  • Purity
    something that only contains one compound or element throughout
  • boiling point
    a chemically pure substance will melt or boil at a specific temperature - you can test for a substances purity by comparing it with the boiling point of that pure substance
  • Formulations
    useful mixtures with a precise purpose - each component is measured exactly and contributes to the properties of the formulation
  • formulation of paint
    pigment, solvent, binder, additives
  • Paper chromatography
    mobile phase = where the molecules can move, this is always a liquid or a gas
    stationary phase = where the molecules can't move - a solid or thick liquid
  • mobile phase
    the chemical that spends more time in the mobile phase will move further through the stationary phase
  • high solubility molecules
    will spend more time in the mobile phase
  • Rf Value
    distance travelled by substance/distance travelled by solvent
  • test for chlorine
    chlorine turns damp litmus paper white
  • test for oxygen
    relight a glowing splint
  • test for carbon dioxide
    when bubbled through lime water it will turn it cloudy
  • test for carbonates
    adding dilute acid, then bubble the gas that is given off through lime water - if it is a carbonate the gas will be carbon dioxide
  • test for sulphates
    using a pipette add a few drops of dilute hydrochloric acid then some barium chloride solution
    if a sulphate is present, a white precipitate will form= bariumsulfate
  • test for halides
    to identify a halide ion, add dilute nitric acid then silver nitrate solution
    a chloride = white precipitate = silver chloride
    a bromide - cream precipitate = silver bromide
    a iodide = yellow precipitate = silver iodide
  • lithium
    crimson flame
  • sodium
    yellow flame
  • potassium
    lilac flame
  • calcium
    orange red flame
  • copper
    green flame
  • Metals with sodium hydroxide
    calcium = white
    Copper = blue
    Iron II = Green
    Iron III = Brown
    Aluminium = white (dissolves in excess - colourless)
    Magnesium - white