Separation of Substances

A separation technique based on the difference in weights of the solids in a solid-solid mixture.

• sieving

• handpicking

• threshing

• winnowing

How are grain seeds removed from their stalks?

• sieving

• winnowing

• threshing

• all of the above

A compound has

• only 1 kind of mixture

• only 1 kind of element

• a mixture of elements and molecules

• only one kind of molecules

Identify the mixture from the following

• oxygen

• carbon dioxide

• hydrogen

• air

Which is the process by which a gas changes into a liquid?

• decantation

• sublimation

• condensation

• sedimentation

How is scrap iron separated from other wastes in the scrap yard?

• sublimation

• magnetic separation

• handpicking

• winnowing

Which of the following mixtures can be separated by using a filter paper?

• vinegar

• salt water

• sand and water

• sugar and water

Nisha poured a mixture of salt, iron filings, sand and flour into a container. Which of the following can be separated from the mixture by using a magnet?

• salt

• flour

• sand

• iron filings

When no more salt can be dissolved in a glass of water it is said to be

• saturated

• sediment

• supernatant

• distilled

The apparatus or method to separate oil and water mixture

• evaporation

• filtration

• separating funnel

• distillation