filtration and crystalisation Flashcards Preview

CHEMISTRY PAPER 1 - ATOMIC STRUCTURE AND THE PERIODIC TABLE > filtration and crystalisation > Flashcards

Flashcards in filtration and crystalisation Deck (9)
Loading flashcards...
1
Q

describe the practical on to how separate a mixture through filtration

A
  1. the mixture is poured into the funnel
  2. insoluble solids remain in the filter paper
  3. solutions and liquids go through the flask
    leaving us with the filtrate
2
Q

describe how to separate a mixture through crystallisation

A
  1. the solution is heated to concentrate the solution
  2. crystals may start to form
  3. its then left in a warm place for the remaining water to evaporate
  4. crystals form
3
Q

describe how to separate a mixture through paper chromatography

A
  1. Draw a pencil like near the bottom of the paper.
  2. add spots of colourings to the line
  3. put the paper into a chromatography tank with a solvent at the bottom and below the line
  4. the soluble dyes are carried up the chromatography paper. Different dyes travel upwards at different rates
4
Q

what is filtration used for?

A

to separate an insoluble solid from a liquid

5
Q

what does a state symbol look like and what does it tell us?

A

(s) (l) (g) (as)

tells us the state of a chemical whether it is a solid, liquid, gas or dissolved in water

6
Q

what do these state symbols tell us about these chemicals
silver chloride = AgCl(s)
water=H2O(l)

A

tells us that
silver chloride is a solid
water is a liquid

7
Q

what can we see at the end of a chromatography experiment

A

the soluble dyes are carried up the chromatography paper. different dyes travel upwards at different rates

8
Q

to turn an aqueous solution into a solid, what is the best method of separation?

A

crystallisation

9
Q

why might leaving the water to evaporate during crystallisation be better than hearing the solution?

A

heating can affect the chemical we are trying to crystallise

certain chemicals would weigh down if we heat them