Topic 9- Part 2 (Hydrocarbons)

Question 1

What are alkanes

Answer 1

saturated hydrocarbons

only single bonds, maximum hydrogens

Question 2

What does the no. in but1ene or but2ene mean?

Answer 2

-Which carbon has the double bond

Question 3

What are alkenes

Answer 3

-unsaturated hydrocarbons
-double bond

could have more hydrogen

Question 4

How do alkanes react with bromine?

Answer 4

-Addition reaction
-Bromine attaches to where double bond/lack of H
–H–H
H-C=C-H + Br-Br –>

—H–H
H-C-C-H
—Br-Br

Br-Br

H H
H-C-C-H
Br-Br

Question 5

How to test for alkene?

Answer 5

-Add bromine water
-If red–>colourless
-alkene is present

Question 6

What happens in complete combustion of hydrocarbons?

Answer 6

-Hydrogens oxidised
-Form CO2 and H2O