lesson 3 filtration and crystilisation

Question 1

Physical separation techniques only work with

Answer 1

mixtures

(do not work with compounds)

Question 2

how is filtration used

Answer 2

to separate an insoluble solid from a liquid

Question 3

what does insoluble mean

Answer 3

the solid will not dissolve in the liquid

Question 4

what do state symbols do

Answer 4

tell us the physical state of the chemical

(s) (l) (g)

or dissolved in water (aq aqueous solution)

Question 5

how is crystallisation used

Answer 5

to separate a soluble solid from a liquid

Question 6

if we leave the crystallisation solution for a few days the water will evaporate meaning the solution will….

Answer 6

turn into crystals of solid

Question 7

in crystallisation the state symbol turns from aq to what

Answer 7

s (solid)

Question 8

how can we make crystallisation faster

Answer 8

by gently heating our solution to evaporate the water

Question 9

we need to be careful if wanting to make crystallisation faster because…..

Answer 9

certain chemicals will break down if we heat them

(so sometimes its better to allow water to evaporate on its own)

Question 10

if we have two substances, what will filtration do…

Answer 10

separate them

Question 11

to do filtration what do we use

Answer 11

filter funnel
filter paper
conical flask

Question 12

what is the first step we do in filtration (after set up)

Answer 12

we start by pouring our mixture into the filter paper

Question 13

in filtration where does the liquid pass through

Answer 13

the tiny pores in the filter paper

Question 14

in filtration what is the liquid called

Answer 14

the filtrate

Question 15

in filtration what happens to the solid material…

Answer 15

it cant pass through the filter paper, so it is trapped

Question 16

what happens at the end of filtration..

Answer 16

we have our liquid separated from or solid