When can filtration be used to separate two substances?

If there is a liquid and a solid in the mixture

Sea water is a mixture, what does it consist of?

Water, salt and dissolved gases

Which of these statements is true?

Compounds have a fixed composition

Which of these statements is true?

Mixtures do not have a fixed composition

Which techniques could be used to get salt from a dry mixture of sand and salt?

Dissolving, filtration and crystallisation

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Elements, Compounds and Mixtures and Separation Techniques

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Elements, compounds and mixtures. Separation techniques. #gcse #chemistry

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Questions 13

Answers

1
What is (a) in the following diagram?
I don't know!
Compound
Element
Mixture
2
When can filtration be used to separate two substances?
To create crystals of a salt
If there are two liquids in the mixture
If there are two different dyes in the mixture
If there is a liquid and a solid in the mixture
3
Sea water is a mixture, what does it consist of?
Water, salt and dissolved gases
Water
Water and salt
Salt and dissolved gases
4
During filtration, a liquid passes through the filter paper, what is this called?
Solid
Residue
Filtrate
Filter
5
What is (c) in the following diagram?
Compound
I don't know!
Mixture
Element
6
Which of these statements is true?
In compounds, the atoms or particles are not joined together
Compounds have a fixed composition
Compounds are hard to separate
Compounds do not have a fixed composition
7
Which of these solids dissolves in water?
Sulphur
Sand
Salt
Graphite
8
Which technique could be used to separate a mixture of water and ethanol?
Crystallisation
Chromatography
Fractional distillation
Simple distillation
9
Which of these statements is true?
Mixtures have a fixed composition
In mixtures, the atoms or compounds are joined together
Mixtures do not have a fixed composition
Mixtures are hard to separate
10
Which of these is a mixture?
Oxygen
Copper sulphate
Graphite
Air
11
Which techniques could be used to get salt from a dry mixture of sand and salt?
Fractional distillation
Dissolving, filtration and crystallisation
Dissolving and distillation
Chromatography
12
What is (b) in the following diagram?
Mixture
Compound
Element
I don't know!
13
During filtration, an insoluble solid collects in the filter paper, what is this called?
Filtrate
Solvent
Solute
Residue

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