C1 Oil, alkanes and fuels Flashcards Preview

AAA - CHEMISTRY - Revision > C1 Oil, alkanes and fuels > Flashcards

Flashcards in C1 Oil, alkanes and fuels Deck (30)
Loading flashcards...
1

What is crude oil?

Mixture of hydrocarbons

2

What is a mixture?

2 or more substances mixed but not chemically bonded together

3

What is the general formula for alkanes?

CnH2n+2

4

What is a hydrocarbon?

Compound made from only carbon and hydrogen

5

Are alkanes saturated or unsaturated?

Saturated

6

Draw a methane molecule.

7

Draw an ethane molecule.

8

Give the formula for a propane molecule.

C3H8

9

Name C4H10.

Butane

10

What does the line in between C-C in a molecule show?

Covalent bond, a shared pair of electrons

11

What method is used to separate crude oil?

Fractional distillation

12

Describe how fractional distillation works?

Crude oil is heated to evaporate and then the different fractions are condensed because of their different boiling points

13

As the number of carbons increase in an alkane what happens to the boiling point?

It increases

14

As the number of carbons increase in an alkane what happens to the viscosity?

It increases, gets more sticky

15

As the number of carbons increase in an alkane what happens to the flammability?

Gets less flammable

16

As the temperature of oil increases what happens to the viscosity?

Gets less viscous, more runny

17

What are the products of complete combustion of hydrocarbons?

Carbon dioxide and water

18

What are the products of incomplete combustion of hydrocarbons?

Carbon monoxide and carbon (soot)

19

If crude oil contains some sulfur what combustion product will be made?

Sulfur dioxide

20

In combustion are carbon and hydrocarbon oxidised or reduced?

Oxidised as oxygen is added

21

High temperatures may cause oxides of nitrogen what type of pollution is caused by the oxides of nitrogen and sulfur dioxide?

Acid rain

22

What effect does this pollution have on the environment?

Weathering of rocks and buildings, and changes acidity of the soil

23

Carbon dioxide causes what type of pollution?

Global warming

24

Solid particles (soot or unburnt fuel) causes what type of pollution?

Global dimming

25

Give 2 ways sulfur dioxide can be reduced?

Removing sulfur before burning of the fuel and removal of sulfur dioxide after burning

26

What are biodiesel and bioethanol made from?

Plants

27

Give two advantages and disadvantages of using hydrogen as an alternative fuel.

Made from water and renewable

Storing is expensive and flammable

28

Give two advantages and disadvantages of using bioethanol as an alternative fuel.

Renewable and doesn’t produce toxic fumes

Need to have the climate to grow sugar cane and it uses lot of fields that could be used for food

29

Why is bioethanol described as carbon neutral?

The carbon dioxide given out when burnt is the carbon dioxide taken in during photosynthesis of the plants

30

What are products of combustion hydrogen?

Water