Properties and uses of Crude Oil Flashcards Preview

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Flashcards in Properties and uses of Crude Oil Deck (19):
1

Crude oil is mostly [ ]

alkanes

2

What are alkanes made up of

Chains of carbon atoms surrounded by hydrogen atoms

3

What are the first 4 alkanes?

1) Methane
2) Ethane
3) Propane
4) Butane

4

What is the formula and structure of methane?

CH₄ H
|
H -- C -- H
|
H

5

What is the formula and structure of ethane?

C₂H₆ H H
| |
H -- C -- C -- H
| |
H H

6

What is the formula and structure of propane?

C₃H₈ H H H
| | |
H -- C -- C -- C -- H
| | |
H H H

7

What is the formula and structure of butane?

C₄H₁₀ H H H H
| | | |
H -- C -- C -- C -- C -- H
| | | |
H H H H

8

What does each straight line on a diagram of an alkane represent?

A covalent bond

9

What does the term saturated mean?

The atoms have formed bonds with as many other atoms as they can - carbon atoms form 4 bonds and hydrogen atoms form 1 bond

10

What is the general formula for an alkane?

CₙH₂ₙ₊₂

11

The [ ] the molecules, the more runny the hydrocarbon - the less [ ] (gloopy) it is

shorter
viscous

12

What does 'more volatile' mean?

The molecules turn into a gas at a lower temperature

13

The shorter the molecules, the [ ] volatile they are therefore, the lower the temperature at which the [ ] vaporises or [ ] and the lower its [ ] point.

more
fraction
condenses
boiling

14

The shorter the molecule the more [ ] the hydrocarbon is

flammable

15

What is refinery gas used for? Why?

Used for bottled gas. The refinery gas fraction has the shortest molecules therefore it has the lowest boiling point - its gas at room temp

16

What is petrol used for? Why?

Petrol is a liquid which is ideal for storing in the fuel tank of a car. It can flow to the engine where its easily vaporised to mix with the air before it's ignited - it has longer molecules so it has a higher boiling point

17

What 2 things helps to decide the use of different fractions?

The volatility and the viscosity

18

What are really viscous hydrocarbons used for?

Lubricating engine parts and for covering roads

19

A short-chain hydrocarbon is [ ] viscous, [ ] volatile and [ ] to ignite than longer-chain hydrocarbons

less
more
easier