GCSE Chemistry C9

Question 1

Where is crude oil

Answer 1

A finite resource found in rocks from the remains of plankton that has been compressed under the erath over many years

Question 2

Give two examples of what hydrocarbons are made are used for

Answer 2

Fuel for planes, cars, stoves

Question 3

How do you seperate crude oil

Answer 3

By using fractional distillation, there are many substances in crude oil and aren’t useful together

Question 4

Why isn’t crude oil useful by itself

Answer 4

There are too many substances that have different boiling points

Question 5

What is the formula for hydrocarbons

Answer 5

CnH2n+2

Question 6

What does n mean in the formula for hydrocarbons

Answer 6

The number of carbons in that specific hydrocarbon

Question 7

Why is there a plus 2 in the formula of hydrocarbons

Answer 7

Because at the end of the chain there are always one hydrocarbon on each end of the chain

Question 8

What are all alkanes

Answer 8

Saturated

Question 9

What are all alkenes

Answer 9

Unsaturated

Question 10

What is a hydrocabon

Answer 10

A compound containing hydrogen and carbon only

Question 11

What is the homologous series

Answer 11

A group of compounds with the same general formula

Question 12

What is the molecular formula of methane

Answer 12

CH4

Question 13

What is the molecular formula of ethane

Answer 13

C two H six

Question 14

What does my elephant prefers bananas stand for

Answer 14

Methane, ethane, propane and butane

Question 15

Where does the lowest boiling point substances go in a faractional distillation chamber and why

Answer 15

At the top because it turns to a gas the quickest so rises up quickly

Question 16

Where does the highest boiling point substances go in a fractional distillation chamber

Answer 16

At the bottom

Question 17

What type of boiling point does a short chain have

Answer 17

Low

Question 18

What type of boiling points does a long chain have

Answer 18

High

Question 19

What type of volatility does a short chain have?

Answer 19

High

Question 20

What is volatility?

Answer 20

The tendency to turned it into a gas

Question 21

What type of viscosity does a short chain have?

Answer 21

Low viscosity/very runny

Question 22

What is viscosity?

Answer 22

How easily it flows

Question 23

What type of flammability does a short chain have?

Answer 23

High

Question 24

What type of volatility does a long chain have?

Answer 24

Low

Question 25

What type of viscosity does a long chain have?

Answer 25

Thick/high viscosity

Question 26

What type of flammability does a long chain have?

Answer 26

Low

Question 27

What is the process which crude oil is separated into useful fractions called

Answer 27

Fractional distillation

Question 28

What is the same about the substances in crude oil?

Answer 28

They all have covalent bonds

Question 29

What is a hydrocarbon?

Answer 29

Compounds that only contain carbon and hydrogen

Question 30

How do you test for the gas produced in cracking alkanes

Answer 30

 Use orange bromine and then the alkene will turn colourless because it has double bonds

Question 31

What is cracking?

Answer 31

When large hydrocarbon molecules are broken down into smaller, more useful, hydrocarbon molecules

Question 32

 How are the chemical bonds in a larger chain broken by cracking

Answer 32

They have a are passed over a hot catalyst of aluminium oxide

Question 33

What is cracking an example of?

Answer 33

Thermal decomposition

Question 34

What is crude oil

Answer 34

A mixture of hydrocarbons that are used as many types of fuel