Topic 2 Chemical Bonding and Structure

Question 1

What are the properties of metallic bonding

Answer 1

1) high melting temperatures
2) good electrical conductivity
3) malleability

Question 2

Why do metals have high melting points

Answer 2

There are high forces of attraction between the positive metal ions and negative delocalised electrons

Question 3

Why are metals good conductors of electricity

Answer 3

The delocalised electrons are attracted to the positive terminal of the battery which allows charge to flow

Question 4

Why are metals malleable

Answer 4

They are in a fixed arrangement so when stress is applied the layers can slide over each other easily

Question 5

What are the trends in ionic radii

Answer 5

As you go down each group the ions have more electrons therefore the ionic radius gets larger

Question 6

What are the properties of ionic bonding

Answer 6

1) High melting points
2) Brittleness
3) Good electrical conductor
when molten

Question 7

Why do ionic substances have high melting points

Answer 7

They are in a giant ionic lattice so there are lots of electrostatic attractions to break

Question 8

Why are ionic substances brittle

Answer 8

If stress is applied the same ions won’t go over each other due to them repelling each other

Question 9

Why are ionic substances good conductors of electricity when molten

Answer 9

As when solid there are no free delocalised electrons that can allow charge to flow through the substance but when molten there are

Question 10

What is electronegativity

Answer 10

The ability of an atom to attract a bonding pair of electrons

Question 11

What are the trends in electronegativity across the periodic table

Answer 11

1) Increases down a group
2) Increases across a period