4 Alkenes Flashcards

1
Q

What are alkenes?

A

They are a homologous series of hydrocarbons which contain a carbon-carbon double bond.

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2
Q

What is the functional group of alkenes?

A

> C=C<

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3
Q

How do you draw ethene?

A
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4
Q

How do you draw propene?

A
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5
Q

How do you draw but-1-ene?

A
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6
Q

How do you draw pentene?

A
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7
Q

How do you know what number should be used in the naming of the alkene?

A

It is the location of the double bond in terms of the chain of carbon.

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8
Q

What happens if there are two double bonds?

A

You specify in the answer where they are on the carbon molecule by using numbers.

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9
Q

What happens to the amount of hydrogens when there is a double bond?

A

There is only one carbon instead of two.

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10
Q

What is the general formula for alkenes?

A

CnH2n.

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11
Q

Why are alkenes classified as unsaturated hydrocarbons?

A

They contain double carbon bonds. They have 2 fewer hydrogen atoms than the alkane with the same number of carbon atoms.

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12
Q

How do addition reactions happen with alkenes?

A

Part of the double bond breaks to become a single C-C bond and the electrons are used to join other atoms on to the two carbon atoms.

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13
Q

How does bromine add to alkenes?

A

They don’t have any need for heat, light or a catalyst.

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14
Q

What is an example of an addition reaction?

A

Bromine water and ethene

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15
Q

What is the word equation for the addition reaction between bromine water and ethene?

A

Ethene + Bromine –> 1,2 dibromoethane

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16
Q

What is the formula for the addition reaction between bromine water and ethene?

A

CH2=cH2 + Br2 –> CH2BrCH2Br.

17
Q

How do you test for an alkene or an alkane?

A

You test with bromine water.

18
Q

What is the method to test if its an alkane or an alkene for a liquid and gas.

A

If you shake an unknown organic compound with bromine water (orange solution) becomes decolourised, it is an alkane. If it is an alkene the orange solution will stay orange.

If its a gas you just bubble it through the bromine water and it should produce the same results.

19
Q

What do we call the molecule if it has a chlorine in it?

A

Chloro-

20
Q

What do we call the molecule if it has a bromine in it?

A

Bromo-

21
Q
A
22
Q
A
23
Q
A