IGCSE Chemistry Complete Guaranteed Success
1. Method used to separate sand from a mixture of sand and water - Answer: Filtration
2. Method used to obtain solid copper sulfate from aqueous copper sulfate - Answer: Crystallisation
3. Method used to obtain red food dye from a mixture of food dy...
IGCSE Chemistry Complete Guaranteed Success
1. Method used to separate sand from a mixture of sand and water
- Answer: Filtration
2. Method used to obtain solid copper sulfate from aqueous copper sulfate
- Answer: Crystallisation
3. Method used to obtain red food dye from a mixture of food dyes
- Answer: Paper chromatography
4. Method used to obtain water from salt water
- Answer: Simple distillation
5. Draw a diagram showing equipment used in simple distillation
, - For what process is this equipment used?
6. Method used to obtain kerosene from crude oil
- Answer: Fractional distillation
7. Draw the equipment used in fractional distillation in the lab
- For what process is this equipment used?
8. Explain how fractional distillation separates a mixture of different liquids
- Answer: Different liquids have varying boiling points.
9. Method used to extract red dye from rose petals
- Answer: Dissolving
,10. Describe how pure salt can be obtained from rock salt
- Steps:
1. Grind rock salt into a fine powder.
2. Add the powder to hot water and stir to dissolve the salt.
3. Filter the mixture; salt solution passes through leaving sand behind.
4. Boil the filtrate to evaporate some water.
5. Allow the saturated solution to cool for salt crystals to form.
6. Filter the cold mixture to separate crystals from the remaining solution.
Ethanol is a flammable liquid. Suggest how it could be heated safely ✔️Use a water bath
Explain how a chromatogram shows that different dyes are different from each other ✔️Each dyes has
a different mixture
, State the expression for calculating molar concentration ✔️Molar concentration = Amount (in
moles)/volume (in dm^³)
Which cation gives a crimson red flame colour? ✔️Li⁺
Which cation gives a orange flame colour? ✔️Na⁺
Which cation gives a lilac flame colour? ✔️K⁺
Which cation gives a brick red flame colour? ✔️Ca²⁺
Describe how you would carry out a flame test ✔️Put solid onto a wire. Put into a blue flame
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