C12-Chemical Analysis

Question 1

Purity?

in advertising

Answer 1

Nothing added to it

Question 2

Pure substance?

in chemistry

Answer 2

Made up of just one element or compound

Question 3

Pure water test?

Answer 3

melting point= 0degrees

boiling point= 100degrees

Question 4

Formulation?

Answer 4

Mixture designed to produce useful product

Question 5

Mixture or pure substance?

Answer 5

Melting point experiment

Question 6

2 phases of chromatography?

Answer 6

Mobile

Stationary

Question 7

Rf?

Answer 7

Retention factor

Question 8

Single spot on chromatography paper?

Answer 8

= Pure substance

Question 9

More than 1 spot on chromatography paper?

Answer 9

= Mixture of compounds

Question 10

Which forces of attraction will carry a substance a greater distance in the time?

Answer 10

Stronger forces of attraction between itself and mobile phase than itself and stationary phase

Question 11

Test for Hydrogen?

Answer 11

React zinc and dilute acid = zinc sulphate & HYDROGEN

collect hydrogen in a test tube

Question 12

Positive test for Hydrogen?

Answer 12

Lit splint at end of test tube = ‘pops’

Question 13

Test for Oxygen?

Answer 13

decomposition of hydrogen peroxide with manganese oxide (as catalyst) = water & OXYGEN

Question 14

Positive test for Oxygen?

Answer 14

Light and blow out splint (glowing) then put in mouth of conical flask
SPLINT RELIGHTS = OXYGEN

Question 15

Test for carbon dioxide?

Answer 15

limewater turns cloudy white

Question 16

Positive test for carbon dioxide?

Answer 16

Cloudy limewater

Question 17

Positive test for chlorine?

Answer 17

Damp blue litmus paper turns white

Question 18

E. Rf?

Answer 18

distance moved by substance / distance moved by solvent