000Chemistry000

Page 1

RAM is the mean mass of an atom of an element compared to Carbon 1/12

Chemical formula shows what a substance is made of

RFM is the mean mass of a UNIT of a substance compared to a carbon 12 atom

Empirical formula is the simplest formula(ratio) that a substance can get

Pure substances are usually made of mainly one element, if they are impure they will have a broad boiling point

Filtration separates insoluble substances from soluble substances (solids from liquids)

Crystallisation is when u heat a solution and the solvent evaporates and leaves the solute behind. If u heat he solution too strongly, u get a powder, if u allow the solvent to evaporate slowly,u get regularly shaped crystals

Distillation is when u separate two liquids through boiling one liquid because it has a lower boiling point that the other liquid. Fractional distillation separates 2 or more substances from a mixture, u use a fractioning column to separate 2 or more substance