Organic Chemistry Experiments

Question 1

Word equation for the preparation of ethene

Answer 1

ethanol —–aluminium oxide—> water +ethene

Question 2

Chemical equation for the preparation of ethene

Answer 2

C2H5OH —— AL2O3 —-> C2H4 + H20

Question 3

What Type of reaction is it for the preparation of ethene

Answer 3

Dehydration/ Elimination

Question 4

What its the catalyst in the experiment for the preparation of ethene?

Answer 4

Aluminium oxide

Question 5

What is the use of ethene ?

Answer 5

making plastics

Question 6

Describe aluminium oxide

Answer 6

white powder used as a catalyst and a dehydration agent

Question 7

What are the physical properties of ethene?

Answer 7

-colourless gass with a sweet smell
-soluable in non polar solvents like cyclohexane
insoluble in polar solvents like water

Question 8

Word equation for combustion of ethene

Answer 8

• place a lighted taper in a test tube of ethene to ignite the gas
• add some limewater and shake gently
• ethene burns with a luminous yellow flame
• limewater turns from clear to milky proving there is carbon dioxide

Question 9

Chemical equation for the combustion of ethene

Answer 9

C2H4 + 302 —–> 2CO2 + 2H20

Question 10

Chemical test for saturation of ethene

Answer 10

C2H4 + 2BR —> C2H4BR2

Question 11

WORDl equation for test for saturation of ethene

Answer 11

• add some bromine water to a test tube of ethene and shake gently
• colour changes from red to colourless proving ethene is unsaturated

Question 12

describe the method for the preparation of ethene

Answer 12

• pour some ethanol into a boiling tube
• use a glass rod to push glass wool into the boiling tube to soak up the ethanol
• clamp the boiling tube on a retort stand horizontally and place some aluminium oxide half way along the boiling tube
• set up the apperatus as showing and gentally heat the ethanol
• must not directly heat the ethanol as it would pass too quickly over the aluminium oxide for it to be converted to ethene
• as the ethanol turns into a vapour it passes over the aluminium oxide and get dehydrated to form ethene gas
• collect test tubes of the gas over water. discord the first test tube as it contains air displaced from the apparatus
• before turning off the Bunsen burner raise the delivery tube above the water to prevent suck back of water which would cause the boiling tube to crack

Question 13

Diagram for the preparation of ethene

Answer 13

boiling tube
ethanol soaked in glass wool
aluminium oxide
retort stand 
bunsen burner
stopper
delivery tube
trough
water
ethene

Question 14

What is 2 precaution of the preparation of ethene

Answer 14

• do not heat the ethanol directly as it will pass to quickly over the aluminium oxide to be dehydrated to form then.
• before turning off the Bunsen burner raise the delivery tube above the water to prevent the suck back of water which would cause the boiling tube to crack