Bonding, Structure and Properties of Matter

Question 1

Why do giant covalent structures have high melting and boiling points

Answer 1

Require lots of energy to overcome the strong covalent bonds

Question 2

What state are giant covalent structures at room temperature and why

Answer 2

Solid
Require lots of energy to overcome strong covalent bonds

Question 3

2 uses of fullerenes (e.g nanotubes)

Answer 3

Drug delivery
Lubricants

Question 4

Why is graphite softer than diamond

Answer 4

In graphite Each carbon atom only bonded to 3 others in hexagonal shape to form layers
Weak intermolecular forces between each layer so they can Slide Over each other
(Whereas in diamond each carbon atom is bonded to 4 others in a strong covalent bond)

Question 5

Why are pure metals malleable

Answer 5

Layers of positive metal ions can Slide Over each other

Question 6

Why are alloys harder than pure metals

Answer 6

Made from atoms of different elements so not regularly arranged therefore layers can’t Slide Over each other

Question 7

Do nano particles have a low or high surface area to volume ratio

Answer 7

High

Question 8

3 Uses of nano particles

Answer 8

Healthcare, cosmetics, catalysts