Vash Education: Organic Chemistry

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Alkanes and Alkenes

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1. Which statement below correctly describes an alkane compound?

1 point

An unsaturated compound with the general formula CnH2n+2

An unsaturated compound with the general formula CnH2n

A saturated compound with the general formula CnH2n+2

A saturated formula with the general formula CnH2n

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2. Select the hydrocarbon that is not an example of an alkane.

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Pentene

Ethane

Hexane

Propane

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3. An alkane completely combusts and produces 3CO2 and 4H2O. What is the name of the alkane that combusts?

1 point

4. Which statements correctly explain the process of incomplete combustion?

Select all that apply.

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Burning in a plentiful supply of oxygen

Burning in a poor supply of oxygen

Carbon monoxide is produced

Water is produced

Carbon dioxide is produced

Some carbon particles are released separately

5. What is the definition of unsaturated bonds?

1 point

Hydrocarbons with only single bonds

Hydrocarbons with only double bonds

Hydrocarbons with only triple bonds

Hydrocarbons with double or triple bonds

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6. The bromine water test is performed on a particular alkene. Dibromoethane is produced.

What is the name of this particular alkene?

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7. What is the colour change that can be expected if an alkene reacts with bromine water?

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Orange brown —> blue black

Orange brown —> colourless

Blue black —> colourless

Blue black —> orange brown

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8. Fill in the missing word.

In the addition reaction of hydrogen and an alkene, a ___ catalyst is used.

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9. What catalysts can be used in addition polymerisation?

Select all that apply

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Oxygen

Potassium Manganate

Nickel

Peroxide

Crude oil

10. Propene is polymerised through addition polymerisation to form polypropene.

Which diagram below shows the polymer?

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Option 1

Option 2

Option 3

Option 4

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