T9 YR11

Question 1

What is organic chemistry?

Answer 1

Chemistry of carbon

Question 2

Where can crude oil come from?

Answer 2

A finite resource - found in rocks, plankton, plants that photosynthesise to release co2

Question 3

Define a hydrocarbon?

Answer 3

Are compounds made up of carbon and hydrogen only

Question 4

Give 4 of the starting hydrocarbons?

Answer 4

Methane - 1 Carbon
Ethane - 2
Propane - 3
Butane - 4

Question 5

Are alkanes saturated or unsaturated?

Answer 5

Saturated

Question 6

What happens to boiling point when chain length increases?

Answer 6

Increases - more energy needed to break intermolecular forces

Question 7

What happens to volatility when chain length increases?

Answer 7

Decreases as volatility is the tendency of substance to turn into a gas, stronger intermolecular forces

Question 8

What happens to viscosity when chain length increases?

Answer 8

Increase due to more energy needed to separate intermolecular forces

Question 9

What happens to flammability when chain length increases?

Answer 9

Decrease as there is more incomplete combustion

Question 10

What does incomplete combustion release?

Answer 10

Carbon monoxide which is a toxic gas that is colourless and can be fatal

Question 11

What is the complete combustion of hydrocarbons?

Answer 11

O2 = CO2 + H2O

Question 12

Give a summary of the process of cracking hydrocarbons?

Answer 12

Steel container called cracking and can occur by heat or catalytic cracking - thermal decomposition reactions take place
ALWAYS FORM AN ALKANE

Question 13

What is the test to differentiate between alkanes and alkenes?

Answer 13

Bromine water test - Alkenes will decolorise bromine water - ALKENES VERY REACTIVE