Alkanes

Question 1

Alkanes are Hydrocarbons, what are Hydrocarbons?

Answer 1

Hydrocarbons are chains of carbon atoms surround by hydrogen atoms

Question 2

Do all Alkanes have chains of the same length?

Answer 2

No, different Alkanes have chains of different lengths

Question 3

What is the general formula for alkanes?

Answer 3

CnH2n+2

Question 4

Name the first 5 alkanes and there molecular and structural formula

Answer 4

1) Methane CH4 CH4
2) Methane * C2H6 CH3CH3*
3) Propane C3H8 CH3CH2CH3
*4) Butane * C4H10 CH3CH2CH2CH3
*5) Pentane * C5H12 CH3CH2CH2CH2CH3

Question 5

What does the phrase ‘the molecules are saturated’ mean?

Answer 5

The molecules only have single bonds between the carbon atoms

Question 6

What makes up most of the hydrocarbons in crude oil?

Answer 6

Alkanes

Question 7

How do alkanes react in combustion?

Answer 7

Alkanes tend to combust completely in a good supply of oxygen

Question 8

For Chlorine and Bromine to react with alkanes, what must be present?

Answer 8

Ultra Violet light

Question 9

Explain the reaction between a halogen and an alkane

Answer 9

In these reactions a hydrogen atom from the alkane is substituted for chlorine or bromine, therefore making this reaction a substitution reaction

Question 10

What is the product of bromine and methane?

Answer 10

Bromomethane