U1 T3 Structures

Question 1

What are the properties of a giant ionic lattice?

Answer 1

Crystalline, high melting point, conducts electricity when liquid, doesn’t conduct when solid, and soluble in water

Question 2

What are the properties of simple covalent / covalent molecular?

Answer 2

Low melting point, doesn’t conduct electricity, not very soluble, soft when solid

Question 3

Diamond, graphite, and graphene are all allotropes of carbon. They are also giant covalent structures. What is an allotrope?

Answer 3

Different forms of the same element in the same physical state.

Question 4

What are the properties of giant covalent structures?

Answer 4

Very high melting point, diamond doesn’t conduct electricity, graphite and graphene do conduct because they have delocalised electrons, insoluble in water, diamond is extremely hard, graphite is a slippery soft solid, graphene is 100 times stronger than steel and is very light, thin, and inexpensive.

Question 5

What are the properties of a giant metallic structure?

Answer 5

High melting point, dense, strong, conducts electricity, conducts heat, malleable, ductile

Question 6

What is an alloy?

Answer 6

A mixture of two or more elements, one being a metal.

Question 7

How do you measure the amount of gold in a gold alloy?

Answer 7

Number of carats / 24 x 100