Fuels & Heat -Nit Pickies

Question 1

How is methane produced

Answer 1

Naturally; slurry, pits, coal mines, refuse dumps

Question 2

Side effect of Methane

Answer 2

Contributes to greenhouse effect-Increase in global warming

Question 3

What Is Alkene

Answer 3

This homologous series has only single bonds between the carbon atoms. They are saturated hydrocarbons and have
tetrahedral geometry.

Question 4

Properties Of Alkanes

Answer 4

1. Soluble in non-polar solvents, e.g. cyclohexane.
2. Insoluble in water because the alkanes are non-polar – they only have Van-der-Waals forces between the molecules.
3. C1-C4 are gases. C5-C16 are liquids. C17 and above are waxy solids – this is because the larger molecules have stronger
   Van-der-Waals forces, increasing their boiling and melting points.

Question 5

Name 5 important Hydrocarbons

Answer 5

1. Hexane
2. Octane
3. Heptane
4. Iso-octane(2,2,4 -trimethlypentane)
5. Cyclohexane

Question 6

What is an Alkene

Answer 6

This homologous series has a double bond between two of the carbon atoms. They are unsaturated hydrocarbons and have planar geometry

Question 7

Properties

Answer 7

1. Soluble in non-polar solvents, e.g. cyclohexane.
2. Insoluble in water because the alkenes are non-polar – they only have Van-der-Waals forces between the molecules.
3. C1-C3 are gases. C4-C14 are liquids. C15 and above are waxy solids – this is because the larger molecules have stronger
   Van-der-Waals forces, increasing their boiling and melting point