Structure 2.4

Question 1

Define alloys

Answer 1

A mixture of two or more metals or a metal and a non-metal

Question 2

Compare alloys to pure metals

Answer 2

Alloys are harder and have greater tensile strength

Question 3

Explain why alloys are harder than pure metals

Answer 3

The added atoms disrupt the lattice structure, making it harder for layers to slide over one another.

Question 4

Define polymers

Answer 4

A class of covalently bonded materials characterized by low thermal and electrical conductivity and low denstiy compared to other materials.

Question 5

How are long polymer chains made?

Answer 5

When monomers join end to end

Question 6

Comment on the melting and boiling points of polymer chains.

Answer 6

Despite being covalent, they have high boiling and melting points due to the number of intermolecular forces that occur along the length of the polymer as well as entanglement.

Question 7

What does it mean if a molecule is unsaturated?

Answer 7

There is a carbon double bond.

Question 8

What is. condensation reaction?

Answer 8

A reaction in which two molecules react to form a larger molecule with the loss of a small molecule, usually water.

Question 9

What does a condensation polymer require?

Answer 9

For both molecules to have two functional groups.

Question 10

How is an amide link polymerization formed?

Answer 10

Carboxylic acid + Diamine

Question 11

How is an ester link formed?

Answer 11

Dicarboxylic acid + Diol