ppr 2

Question 1

Bromine is a non-polar molecule. Explain the existence of the partially positive bromine that attracts the electrons in the alkene double bond.

Answer 1

The electron-dense double bond in the alkene induces a temporary dipole in the bromine molecule, thus creating a partially positive bromine atom to allow the first step of the mechanism to occur.

Question 2

State and explain the difference in properties between thermosetting and thermosoftening polymers.

Answer 2

Thermosetting polymers do not melt when heated and cannot be reshaped. This is due to the strong covalent bonds linking polymer chains together.

Thermosoftening polymers melt when heated and can be reshaped. This can happen because the only intermolecular forces between polymer chains are weak van der Waals forces.

Question 3

Terylene – YOU NEED TO KNOW THIS EXAMPLE

Answer 3

ethane 1, 2 diol and benzene 1-4 di carboxylic acid

Question 4

Terylene – YOU NEED TO KNOW THIS EXAMPLE

Answer 4

ethane 1, 2 diol and benzene 1-4 di carboxylic acid

Question 5

nylon 6 6

Answer 5

1,6-diaminohexane: Hexane-1,6-dicarboxylic acid:

Question 6

kevalr

Answer 6

benzene-1,4-diamine benzene-1,4-dicarboxylic acid