chem

what is sieving?

• method of separation by which the particles are separated based on their sizes.

• compound

• can be separated into 2 or more pure substances by physical or mechanical separation.

• they can be decomposed into simpler substances.

define Compound?

• having non-uniform composition.

• pure substance by which cannot decomposed into simpler substance.

• pure substance by which decomposed into simpler substance.

• pure substance.

define element?

• separation process where soluble impurities are separated from the solution.

• pure substance by which cannot decomposed into simpler substance.

• none

• pure substance by which decomposed into simpler subnstance.

list several exanples of fractional distillation

• Products of liquid nitrogen and argon gas.

• separation of compound substances.

• no answer

• separation of crude oil into various commercial products.

list several methods of separation?

• sieving , fractional , disillation

• sieving, distillation, evaporation, fractional distillation

• none of them

• contribution, sieving , ....

where do you use sieve?

• separate the similar size

• separate the mixture which have similar particle size.

• separate the mixture whose substances have different sizes.

• separate the mixture by which the substances have similar particls .

dry sand...

• separation adding

• magnetic separation, adding water - dissolving salts

• undissolving solid can be separated

• wrong question

descride the method to separate dissolved solids in liquids.

• use evaporation- evaporate liquid , dissoliving solid will be left at the bottom.

• use evaporatiion- evaporate solid , dissolving liquid will be left at the bottom.

• Evaporate liquid , boil solid

• evaporate liquid , dissolving solid will be left at first.

is the process of carefully pouring liquid

• filtration

• evaporation

• decantation

• distillation