Chemical Analysis

Question 1

What is a pure substance in chemistry

Answer 1

Contains a single element or compound

Question 2

What’s a formulation

Answer 2

A mixture with a specific recipe designed to have specific properties

Question 3

Examples of formulation

Answer 3

Cosmetics, cleaning agents, paints

Question 4

Calculate RF value

Answer 4

Distance travelled by substance divided by distance travelled by solvent

Question 5

Test for hydrogen

Answer 5

Squeaky pop from a lit splint

Question 6

Test for carbon dioxide

Answer 6

Bubble the gas through lime water and white precipitate will form

Question 7

Test for chlorine

Answer 7

Damp blue litmus paper bleached by gas

Question 8

Test for aluminum calcium and magnesium ions

Answer 8

Sodium hydroxide and a white precipitate will form, the Al precipitate will redissolve upon adding excess hydroxide, the others will not

Question 9

What happens when sodium hydroxide is added to copper and iron

Answer 9

Copper 11 turns blue
Iron 11 turns green
Iron 111 turns brown

Great Britain

Question 10

What is the test got a carbonate ion

Answer 10

Add acid, a carbon dioxide should be released (tested with lime water)

Question 11

Test for sulfate ion

Answer 11

Hydrochloric acid with barium chloride. White precipitate will form

Question 12

Colours of metals in. Flame test

Answer 12

Lithium is crimson
Sodium is orange
Postassium is lilac
Calcium is red
Copper is green

Question 13

Three advantages of intrumentsl analysis

Answer 13

Rapid, accurate, sensitive