mixtures

Question 1

what do mixtures contain;?

Answer 1

at least two different element or compounds
no chemical bonds
they are easily seperated unlike compounds

Question 2

is air a misture?

Answer 2

yes air is a mixture of gases, mainly nitrogen argon carbon dioxide and oxygen

Question 3

is crude oil a mixture?

Answer 3

yes indeed its a mixture off different length hydrocarbon molecules

Question 4

what can mixtures be seperated by

Answer 4

filtration
crystlisation
simple distillation
fractional distilation chromotography

Question 5

properties of mixture?

Question 6

what types of seperation techniques do you know =

Answer 6

filtration =
crystilisation
they both seperate mixtures solids from liquids
distillation
chromotography

Question 7

filtration step by step

Answer 7

1=put some filter paper in funnel
2=pour mixture in funnel
3=make sure mixture not go above funnel
4=liquid passes through paper into beaker . Solid left behind in beaker

Question 8

two ways to seperate soluble solids from soultions

Answer 8

crystilisation and evaporations

Question 9

evaporation step by step

Answer 9

1= slowly heat the solution in an evaporating dish. solvent will evaporate
2=eventually crystals will start to form
3=keep heating until crystals are completely dry
evaporation is a really quick way of separating a soluble salt from a solution but you can only use it if the salt does not break down when its heated otherwise youll have to use crystilisation

Question 10

crystillisation step by step

Answer 10

1= gently heat the solution in evaporating dish . some of solvent will evaporate
2=once some of the solvent has evaporated or when seeing crystals starting to form stop heating leave solution to cool
3=salt should start to form crystals
4= filter the crystals out of solution leaving them in warm place to dry

Question 11

filtration and crystilisation can be used to seperate rock and salt how do you do that?

Answer 11

rock salt is a mixture of salt and sand salt dissolves in water but sand doesnt
1=grind the mixture to make sure the salt crystals are small so will dissolve easily
2=put mixture in water and stir . salt will dissolve but sand will not
3= filter the mixture .grains of sand wont fit through tiny holes in filter paper so they collect on paper instead.the salt passes through the filter paper as it part of solution
4=use evaporation or crsystilisation so that you end up with dry crystals of salt