Hydrocarbons

Question 1

What is the homologous series?

Answer 1

Family of molecules which have the same formula and properties

Question 2

What is the formal for methane 
Ethane
Dodecane
Icosane
Tetracontane

Answer 2

Methane CH4
Ethane  C2H6
Dodecane C12H26
Icosane C20H42
Tetracontane C40H82

Question 3

What are the boiling points of methane ethane dodecane icosane tetracontane ?

Answer 3

Methane -162
Ethane -89
Dodecane 216
Icosane 343
Tetracontane 524

Question 4

What determines the properties of hydrocarbons?

Answer 4

The size of the hydrocarbons, the physical properties are formed by the intermolecular forces.

Question 5

Properties of hydrocarbons?

Answer 5

Easy to ignite
, mix with oxygen which bursts into flame which spark

Longer hydrocarbons liquids at room temperature , high boiling points harder to ignite.

Question 6

What does viscosity mean?

Answer 6

How easily a substance flows.

The stronger force between hydrocarbons mean it’s harder to flow,

Question 7

What are the viscosity of long and short hydrocarbons?

Answer 7

Longer hydrocarbons have higher viscosity , really thick

Short hydrocarbons have lower viscosity and are much runnier.

Question 8

What is called complete combustion?

Answer 8

When you burn hydrocarbons in plenty of oxygen .
Eg

Hydrocarbon + oxygen -> carbon dioxide + water

Question 9

What is incomplete combustion?

Answer 9

When hydrocarbons burns in a limited supply of oxygen