C2

Question 1

What type of bonding happens between a metal and non-metal

Answer 1

Ionic

Question 2

What type of bonding happens between 2 metals? ​

Answer 2

Metallic

Question 3

What type of bonding happens between 2 non-metals?

Answer 3

Covalent

Question 4

What charge do ions of group 2 elements have?

Answer 4

+2

Question 5

What charge do ions of group 7 elements have?

Answer 5

-1

Question 6

Explain in terms of electrons what occurs when magnesium bonds with oxygen?

Answer 6

Two electrons transfer from the magnesium atom to the oxygen atom forming Mg2+ ions and O2- ions

Question 7

What is the name for a substance made of billions of oppositely charged ions joined together?

Answer 7

Giant ionic lattice

Question 8

Explain why ionic substances have high melting points.

Answer 8

There are strong (electrostatic) forces of attraction between oppositely charged ions. A lot of energy is required to overcome them.

Question 9

Explain why ionic compounds do not conduct electricity when solid.

Answer 9

Because the ions are not free to move.

Question 10

What is the name given to the structure of diamond, graphite and silicon dioxide?

Answer 10

Giant covalent

Question 11

How many bonds does each carbon have in diamond?

Answer 11

4

Question 12

Explain why diamond has a high melting point.

Answer 12

Giant structure, millions of strong covalent bonds between the atoms, requires a lot of energy to break.

Question 13

Why does graphite conduct electricity?

Answer 13

There are delocalised electrons to carry the charge.

Question 14

Explain why graphite is soft and slippery and can act as a lubricant.

Answer 14

Weak forces of attraction between layers are easily overcome, which means that the layers are free to slide over each other.

Question 15

Which is stronger an alloy or a pure metal?

Answer 15

Alloy

Question 16

What is graphene?

Answer 16

Single layer of graphite

Question 17

What is a fullerene?

Answer 17

Substances made of carbon atoms arranged to form hollow structures, e.g. in a ball, tube or cage.

Question 17

What type of substance are methane, oxygen and water?

Answer 17

Simple molecular

Question 18

Explain why methane has a low melting point.

Answer 18

It is a simple molecular substance with weak (intermolecular) forces between the molecules, which require very little energy to overcome them.

Question 19

Describe the main features of metals in terms of their structure.

Answer 19

Positive metal ions arranged in layers with delocalised electrons moving throughout the structure.