C2 .2

Question 1

Properties of ionic compounds

Answer 1

High melting and boiling points.
Do not conduct electricity when solid
Do conduct electricity when molten or dissolved
Need large amounts of energy to break the ionic bonds

Question 2

Groups

Answer 2

Go down.
elements with similar properties are placed in columns.
same number of outer shell electrons

Question 3

Periods

Answer 3

In rows across and have the same number of electrons shells.

Question 4

Metals

Answer 4

Metals found to the left of the periodic table.
Form positive ions
conductors high melting and boiling points

Question 5

Nonmetals

Answer 5

Found on the right of the periodic table. Form negative ions insulated low melting and boiling points

Question 6

Metallic bonding MGH 🐔

Answer 6

Good conductors of electricity and heat because of free moving delocalised electrons

High melting and boiling points due to strong metallic bonds that need a lot of energy to break

Malleable as the structure is in layers allowing them to slide

Question 7

Ionic bonding

Answer 7

Metal atoms lose electrons to become positively charged ions

Group one ions equals +1 ions and group two form +2 ions

Non-metal atoms gain electrons become negatively charged ions group 6 -2 ions group 7 -1 ions

Question 8

Explain why diamond is very hard

Answer 8

Each carbon atom is bonded to 4 others by strong covalent bonds that need a lot of energy to break

Question 9

Why is the graphite soft

Answer 9

Why is the graphite soft The layers of carbon can slide past each other due to weak intermolecular forces

Question 10

Why is graphite a good electrical conductor

Answer 10

Each carbon is bonded to 3 others leaving a free moving delocalised electron

Question 11

Why does carbon dioxide have a low boiling point

Answer 11

It has a weak intermolecular forces

Question 12

Describe a giant ionic lattice

Answer 12

Has a high melting point as there are a lot of strong ionic forces between the positive and negative ions

Does not conduct electricity as the ions are in a fixed position and can’t move while solid

When in molten or solution form the ions can flow and carry electric charge

Question 13

What is the covalent bond

Answer 13

A shared pair of electrons formed between two non-metal atoms.

Question 14

What are the allotropes of carbon

Answer 14

Diamond graphite Graafian and buckyball

Question 15

Compare mendaleves

periodic table compare to the one today

Answer 15

Arrange elements in order of increasing atomic weight.

Elements with similar chemical properties in the same group

Gaps left for elements that he predicted that had not yet been discovered

Question 16

Graphene

Answer 16

Strong because of strong covalent bonds good conductor of electricity that has a delocalise electron

Question 17

What is this size of a nanoparticlw

Answer 17

Between one and 100 nm

Question 18

What are some uses of nano particles

Answer 18

Healthcare
cosmetics
suncream
catalysts
deodorant. 

They can be harmful to people by entering the brain after being absorbed into the bloodstream

Question 19

Giant covalent structure examples

Answer 19

Diamond graphite silicon dioxide