Chemical analysis

Question 1

what is a pure substance

Answer 1

a single element or compound,not mixed with any other substance

Question 2

what is formulation,how is it made

Answer 2

.a formulation is a mixture of compounds that has been designed as a useful product

.formulations include fuels , cleaning agents,paints,medicines,alloys, fertilisers and foods.

Question 3

describe paper chromotography

Answer 3

. A start line is drawn near the bottom of the paper

.A beaker is filled with small amount of solvent

.paper is hung on a rod and placed in a beaker

.solvent travels up the paper,thus seperating components

.before solvent level reaches the end , the paper is taken out, and the finish line is marked.the paper is dried

.stronger attraction for the paper-travels slowly with the solvent

.paper is called the stationary phase- it doesent move . solvent is the mobile phase.

Question 4

how is rf calculated

Answer 4

distance moved by the spot-distance moved by solvent

Question 5

describe the tests for hydrogen oxygen , carbon dioxide and chlorine

Answer 5

hydrogen-pop with burning splint over gas
Oxygen-glowing splint relights
Carbon dioxide- turns carbon hydroxide lime water, cloudy
chlorine- bleaches damp litumus paper and makes it white