Separating and Analysing Flashcards Preview

General IGCSE Chemistry > Separating and Analysing > Flashcards

Flashcards in Separating and Analysing Deck (7)
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1
Q

Making pure salt from rock salt 1 soluble 1 insoluble

A

Crush/mix salt with hot water. Impurities filtered with paper. Boil salt solution.

2
Q

Making pure water from sea water

A

Solution boiled, then condensed, salt remains in flask

3
Q

Fractional Distillation

A

Different boiling points, boil at lowest then condense leaving separations.

4
Q

Recrystallisation

A

Purify soluble with other soluble substances. Solid dissolved in hot water then cooled. Most solids less soluble in cold than hot so crystals form, dry.

5
Q

Separating Petrol and water

A

They won’t mix so use a separating funnel

6
Q

Chromatography

A

Ink on chroma paper in tube with solvent (water). Dyes differ in strength to paper and solubility. Pattern chromatogram. Low stick less soluble high opposite

7
Q

Chromatography equation

A

Rf = distance moved by the compound ÷ distance moved by the solvent