Analysis

Question 1

Pure substance

Answer 1

One containing only one element/ compound

Question 2

How to test purity

Answer 2

The pure substances melt and boil at specific temperatures
If impure- lower mp, larger range.
Larger bp, larger range

Question 3

Formulations

Answer 3

Useful mixtures with a precise purpose and a measured quantity of each part

Question 4

Paint

Answer 4

Pigment- gives colour
Solvent- dissolves other parts
Binder- forms a film that holds the pigment in place
Additives- further change the properties

Question 5

Formulation examples

Answer 5

Pills- right concentration, consumable, long shelf life
Cleaning products, fuels, cosmetics
Contains composition on packaging

Question 6

Chromatography phases

Answer 6

Mobile- liquid/gas

Stationary- solid/very thick liquid

Question 7

Chromatography

Answer 7

Move between mobile and stationary phases
Mobile moves through stationary with anything dissolved in it
Chemicals that spend longer in mobile move further
Components separate bases on where they are longer

Question 8

Flame emission spectroscopy

Answer 8

Electrons vibrate when hot, when it cools down they return and emit light
Passes through a spectroscope- produces a line spectrum
Depend on charge and electron arrangement- nothing produces the same
Intensity decides concentration

Question 9

Spectroscopy for mixtures

Answer 9

You see which 2 make the final set of lines

Question 10

Machine spectroscopy

Answer 10

Use instrumental analysis
Very sensitive
Very fast + automated
Very accurate