Purity, Formulation And Chromatography

Question 1

What is a pure substance

Answer 1

Single element or compound containing only one substance

Question 2

How to work out how pure a substance is

Answer 2

Pure substances have specific melting and boiling points so the closer the values of your experiment are to those in the data book, the more pure the sample is

Question 3

Impurities

Answer 3

Increase boiling points and lower melting points

Question 4

What are formulations

Answer 4

Mixtures of chemicals that have been designed to create useful products

Question 5

Formulations

Answer 5

Each component helps decide what the mixtures overall properties are

Each component must be present in precisely measure quantitys

Eg
Fuels
Medicines

Question 6

2 phases in Chromatography

Answer 6

Mobile phase: substance is picked duo and carried by a mobile phase ( the solvent)

Stationary phase: the mobile phase then moves through a stationary phase
( the paper)

Question 7

Separation on substances in Chromatography

Answer 7

Depends on distribution of substances across the 2 phases

A substance moves far if its more attracted to the mobile phase

A substances doesn’t move far if it’s attracted to the stationary phase

Different components can be equally attracted to a solvent so the number of spots a mixture produces can vary depending on solvent used

Question 8

What does Chromatography do

Answer 8

Separates a mixture into its different components

Question 9

Paper Chromatography

Answer 9

The bottom of the Chromatography paper ( containing the stationary phase) is dipped into the solvent ( mobile phase).

The solvent travels up the paper and picks up and transports the substances being tested up the paper

The substances that have travelled the furthest are the most soluble. They are minimally attracted to the Chromatography paper