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WorksheetsEthene
Total questions: 20
Worksheet time: 10mins
Why is aluminium oxide placed halfway along the boiling tube?
To cool the ethanol
To dry the ethene gas
To allow ethanol vapour to pass over a hot catalyst
To prevent water entering the apparatus
What is the main role of aluminium oxide in this experiment?
Solvent
Catalyst
Reactant
Indicator
Why is glass wool used at the bottom of the boiling tube?
To block the delivery tube
To filter the gas
To soak up ethanol and prevent splashing
To cool the ethanol
The first test tube of gas collected is discarded because it:
Contains only water vapour
Contains pure ethene
Is contaminated with air
Is too hot
Ethene can be collected by water displacement because it is:
Dense
Soluble in water
Reactive with water
Insoluble in water
The conversion of ethanol to ethene is an example of:
Oxidation
Polymerisation
Dehydration
Neutralisation
What happens if the aluminium oxide is not heated strongly enough?
Ethene burns
No catalyst forms
Little or no ethene is produced
Water turns milky
When ethene burns, the bright luminous flame suggests:
Complete combustion
High carbon content
Presence of nitrogen
Low temperature
Black soot during combustion indicates:
Excess oxygen
No reaction
Incomplete combustion
Presence of bromine
Limewater turning milky confirms the presence of:
Oxygen
Carbon monoxide
Water vapour
Carbon dioxide
What colour change occurs when bromine water reacts with ethene?
Blue to green
Colourless to brown
Orange-brown to colourless
Purple to colourless
Bromine water decolourises because ethene contains:
A triple bond
A single bond
A benzene ring
A double bond
The reaction between ethene and bromine is best described as:
Substitution
Addition
Combustion
Hydrolysis
Potassium manganate(VII) changes from purple to colourless due arbitrary-items?
Presence of CO2
Saturation of ethene
Reaction with a C=C bond
Evaporation
Which compound would NOT change the colour of bromine water?
Ethene
Propene
Ethane
Butene
Why must ethanol be heated gently?
To stop it evaporating
To prevent cracking of the tube
To ensure controlled vapour production
To reduce flame size
Why must the apparatus be dismantled before switching off the Bunsen burner?
To reduce pressure build-up
To cool the catalyst
To release oxygen
To prevent evaporation
A failure to shake the test tube during the potassium manganate(VII) test would:
Speed up the reaction
Prevent proper contact with the gas
Increase heat production
Make the colour darker
Which observation best confirms ethene is unsaturated?
It burns with a blue flame
It turns limewater milky
It decolourises bromine water
It produces steam
Which equation represents the preparation of ethene from ethanol?
C2H4 + O2 → CO2 + H2O
C2H6 → C2H4 + H2
C2H5OH → C2H4 + H2O
C2H4 + Br2 → C2H4Br2
