DF3- Alkanes

Question 1

What are alkanes

Answer 1

Saturated hydrocarbons- compounds made only from carbon and hydrogen, that contain maximum number of hydrogen atoms

Question 2

Give general formula of alkanes

Answer 2

CnH2n+2

Question 3

Define homologous series

Answer 3

Same general formula, each member differs by CH2

Question 4

Give first 4 alkanes in order of carbons

Answer 4

• methane
• ethane
• butane
• propane

Question 5

Define structural isomer

Answer 5

Same molecular formula, different structural arrangement

Question 6

Define aromatic compounds

Answer 6

Compounds that contain 1 or more benzene rings

Question 7

Define aliphatic compounds

Answer 7

Carbons are joined in branched/unbranched chains, do not contain benzene ring

Question 8

Define cyclic hydrocarbons

Answer 8

Carbons are joined in a ring

Question 9

What is benzene?

Answer 9

• Ring of 6 carbons

- has special properties

Question 10

Define functional group

Answer 10

Modifier on organic molecule responsible for its characteristic chemical reactions

Question 11

Why don’t alkanes mix with water?

Answer 11

• contain non polar molecules

- water contains polar molecules; attract each other and prevent alkanes molecules mixing with them

Question 12

What determines if alkanes is solid, gas or liquid?

Answer 12

Size of molecule