Separation Of Substances

What is Winnowing ?

• A method used to separate the components of a mixture which are different sizes.substances.

• The practice of separating undesirable solid substances and impurities from useful solids by hand.

• A method used to separate lighter components of a mixture from the heavier ones by wind or by blowing air.

What is a mixture?

• A chemical combination of two or more different substances.

• A physical combination of two or more different substances.

• A chemically pure substance.

• A special type of solution

A fruit salad is a

• solution

• mixture

Hand picking method is effective in

• solid mixture

• Liquid mixture

• Gaseous mixture

• None of these

Lauren wants to separate salt from water. What separation technique should she use?

• Evaporation

• Condensation

• Chromatography

What name is given to the solid left on the filter paper after the process of filtration ?

• the filtrate

• the resident

• the product

• the residue

The process of changing solid to gas directly is ______

• Evaporation

• Condensation

• Melting

• Sublimation

SEA WATER IS A MIXTURE OF

• WATER AND COMMON SALT

• WATER AND SEVERAL SALTS

• WATER AND OXYGEN

AIR IS A MIXTURE OF

• SEVERAL GASES

• WATER VAPOURS AND SMOKE PARTICLES

• DUST

• ALL OF THE ABOVE

SEPARATION OF MIXTURES INTO THEIR CONSTITUENTS IS OFTEN NECESSARY TO..

• TO REMOVE UNDESIRABLE CONSTIUENTS

• TO REMOVE HARMFUL CONSTITUENTS

• TO OBTAIN PURE SUBSTANCES

• ALL OF THE ABOVE