4c + 4d Alkanes and alkenes

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what is the general formula for alkanes

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CnH2n+2

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why are alkanes saturated hydrocarbons?

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they contain no double C=C bonds so carbons are saturated because each carbon has its maximum of 4 single bonds

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spec points 4.19 - 4.28

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12 Terms

1
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what is the general formula for alkanes

CnH2n+2

2
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why are alkanes saturated hydrocarbons?

they contain no double C=C bonds so carbons are saturated because each carbon has its maximum of 4 single bonds

3
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draw the first 5 alkanes

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4
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how do alkanes react with halogens?

they react under UV light such as sunlight

<p>they react under UV light such as sunlight</p>
5
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what do you see when an alkane and bromine gas react?

the mixture bromine and the alkane is orange but when reacted with an alkane under UV light, the solution is colourless

<p>the mixture bromine and the alkane is orange but when reacted with an alkane under UV light, the solution is colourless</p>
6
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what is the functional group of alkenes?

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7
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what is the general formula for alkenes?

CnH2n

8
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why are alkenes unsaturated hydrocarbons?

they contain one or more C=C double bonds

9
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draw the first 3 alkenes

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10
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how do alkenes and bromine react?

  • addition reaction

  • alkene + bromine → dibromoalkane

<ul><li><p>addition reaction</p></li><li><p>alkene + bromine → dibromoalk<strong>ane</strong></p></li></ul>
11
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what happens when alkenes and bromine react?

the removal of the C=C double bond

12
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how can alkanes and alkenes be distinguished?

  • alkenes react with bromine water → turns from orange to colourless

  • alkanes DO NOT react with bromine water → it remains orange