Ethene

Question 1

What’s an unsaturated hydrocarbon

Answer 1

Unsaturated = contains at least one c to c double bond 
Hydrocarbon= consists of hydrogen and carbon only

Question 2

Chemical equation for ethene

Answer 2

C(2)h(5)oh=c(2)h(4)+h(2)o

Question 3

Draw labelled diagram of apparatus

Answer 3

Ethanol and glass wool in test tube ( horizontally above Bunsen burner)
Al2o3( small lump in middle of test tube)
Ethene
Water

Question 4

How is ethene collected ? What property of ethene makes this possible ? Explain

Answer 4

Over water
Ethene is non polar
Water is polar so non polar compounds won’t dissolve in it

Question 5

How would u demonstrate that ethene is unsaturated

Answer 5

Shake with bromine water goes from red / brown to colourless

Question 6

Describe the smell and appearance of ethene

Answer 6

Colourless gas with sweetish smell

Question 7

How does the flame of ethene compare to ethene?

Answer 7

Yellow luminous and non smoky

Question 8

What type of reaction is used in the production of ethene

Answer 8

Elimination

Question 9

Describe the appearance of the powder in the test tube

Answer 9

White

Question 10

What is the purpose of the glass wool

Answer 10

To hold the ethanol in place

Question 11

What is the purpose of alimminum oxide

Answer 11

Catalyst

Question 12

3 safety precautions carried out during experiment

Answer 12

No naked flames = ethene is flammable explosive
Remove delivery tube when heating is stopped = prevent suck back
Wear safety glasses = danger of explosion

Question 13

Eq for combustion of ethene

Answer 13

C(2)h(4) + 3o(2) = 2co(2) + 2h(2)o

Question 14

Major use for ethene

Answer 14

Ripening fruit

Question 15

At what stage in the procedure is suck back more likely to occur

Answer 15

When heating is stopped

Question 16

How can it be prevented

Answer 16

Remove delivery tube from water

Question 17

What is the possible outcome for suckback

Answer 17

Explosion