Chemical Analysis

Question 1

Test for Hydrogen

Answer 1

Lighted splint in gas goes ‘pop’

Question 2

Test for Oxygen

Answer 2

Glowing splint in gas relights

Question 3

Test for Carbon dioxide

Answer 3

Bubble gas through limewater. Bluewater goes cloudy

Question 4

Test for Ammonia

Answer 4

Damp red litmus paper turns blue

Question 5

Flame colour for Sodium

Answer 5

Yellow/Orange

Question 6

Flame colour for Potassium

Answer 6

Lilac

Question 7

Flame colour for Calcium

Answer 7

Brick red

Question 8

Flame colour for Copper (II)

Answer 8

Green

Question 9

Hydroxide precipitate colour for Iron (II)

Answer 9

Green

Question 10

Hydroxide precipitate colour for Iron (III)

Answer 10

Red/Brown

Question 11

Hydroxide precipitate colour for Copper (II)

Answer 11

Blue

Question 12

Silver halide precipitate colour for Chloride

Answer 12

White

Question 13

Silver halide precipitate colour for Bromide

Answer 13

Cream

Question 14

Silver halide precipitate colour for Iodide

Answer 14

Primrose yellow

Question 15

Test for Alkenes

Answer 15

Bromine water

Orange to colourless

Question 16

Test for carboxylic acids

Answer 16

Sodium carbonate
Fizzing (effervescent)
Carbon dioxide produced (turn limewater cloudy)

Question 17

Test for alcohols

Answer 17

Acidified potassium dichromate
Oxidizes alcohol to make carboxylic acids
Orange to green