NCEA Level 2 Chemistry

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created 7 years ago by nobraintoosmall
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Organic reagents; How to recognise or test for organic chemicals
updated 7 years ago by nobraintoosmall
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chemistry
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1

Observation: Alkane + bromine water (in sunlight)

Orange bromine water is slowly decolourised

2

Observation: Alkene + bromine water

Orange bromine water is rapidly decolourised

3

Observation: Alkene + acidified potassium permanganate solution

Purple potassium permanganate solution is decolourised

4

Observation: Amine and
(1) damp red litmus
(2) damp green UI paper

(1) turns from red to blue
(2) turns from green to blue

5

Observation: Carboxylic acid and
(1) damp blue litmus
(2) damp green UI paper

(1) turns from blue to red
(2) turns from green to orange

6

Observation: Carboxylic acid and Mg metal

Bubbles of colourless gas

7

Observation: Carboxylic acid and sodium hydrogen carbonate

Bubbles of colourless gas

8

Observation: Alkene + potassium permanganate solution (not acifdified)

Purple potassium permanganate solution forms a brown precipitate

9

Observation: Alcohol heated with acidified potassium permanganate solution

Purple potassium permanganate solution is decolourised

10

Observation: Alcohol heated with acidified potassium dichromate solution

Orange potassium dichromate solution turns green

11

Observation: Alkane, alkene or alkyne is added to water

Two layers form (immiscible)

12

Observation: Hydrocarbon burns with complete combustion

No soot, clean blue flame

13

Observation: Hydrocarbon burns with incomplete combustion

Soot, dirty orange-yellow flame

14

Observation: Haloalkane is added to water

Cloudy when shaken or two layers form (immiscible)

15

Observation: Alkyne + bromine water

Orange bromine water is rapidly decolourised