Mixtures and separation

Which of these solids dissolves in water?

• sand

• salt

• chalk

• sulphur

When can filtration be used?

• To separate a solid from a liquid

• To separate two liquids

• To crystallise salt

• To separate a mixture of different coloured dyes

During filtration, an insoluble solid collects in the filter paper. What is this called?

• solute

• filtrate

• solvent

• residue

During filtration a liquid passes through the filter paper. What is this called?

• chalk

• residue

• filtrate

• insoluble

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

• Dissolve the salt, filter the solution, recrystallise the salt

• Fractional distillation

• chromatography

• Filter the dry mixture, crystallise the salt

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

• Salt and gases

• water

• Water and salt

• Water, salt and gases

Which of these is a mixture?

• oxygen

• Air

• Copper sulphate

• Quartz

Which of these is not a mixture?

• Sea water

• Granite

• Calcium carbonate

• Air

Which of these statement is true?

• Mixtures have a fixed composition

• In mixtures the atoms or compounds are joined together

• Mixtures are hard to separate

• Mixtures do not have a fixed composition

Which of these statement is true?

• Compounds are easy to separate

• Compounds have a fixed composition

• Compounds do not have a fixed composition

• In compounds the atoms or particles are not joined together