7 Organic Trilogy and Seperate 1 Flashcards Preview

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Flashcards in 7 Organic Trilogy and Seperate 1 Deck (21)
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1

What is crude oil?

A mixture of hydrocarbons

2

What is crude oil formed from?

The remains of ancient biomass (mostly plankton) that was buried in mud

3

What is a finite resource?

One that will run out

4

Why is crude oil a finite resource?

Because it takes longer to form than the rate at which we are using it up

5

What is a hydrocarbon?

A compound made of atoms of carbon and hydrogen only

6

What is a general formula?

A mathematical formula which allows you to work out the chemical formula of a substance

7

What is an alkane?

A hydrocarbon with only single bonds

8

Name the first four alkanes

Methane, ethane, propane, butane

9

What is the general formula for alkanes?

CnH2n+2 (the n and 2n are small)

10

How does boiling point change with the length of an alkane?

The longer the alkane, the higher its boiling point

11

How does viscosity change with the length of an alkane?

The longer the alkane, the more viscous (the thicker) it is

12

How does flammability change with the length of an alkane?

The longer the alkane, the less flammable it is

13

What is fractional distillation?

A process used to separate mixtures of substances with different boiling points

14

What are the steps involved in fractional distillation?

Crude oil is vaporised, different molecules rise up the fractionating column and cool down. Condense at different points on the column.

15

Why is fractional distillation important?

Because the different fractions have different uses

16

What is a fuel?

A substance which when reacted with oxygen releases energy

17

Name five fuels we obtain from crude oil

Petrol, diesel, kerosene, heavy fuel oil and liquefied petroleum gases

18

What other uses are there for products of fractional distillation?

Solvents, lubricants, polymers and detergents

19

What is combustion?

The reaction of a fuel with oxygen

20

What are the products of complete combustion?

Carbon dioxide and water

21

When does incomplete combustion occur?

When there is not enough oxygen present