Structure And Bonding

Question 0

By what force are ionic compounds help together by?

Answer 0

Strong electrostatic forces between oppositely charged ions

Question 1

What is ionic bonding?

Answer 1

When non metals and metals transfer electrons to become ions

Question 2

What happens when ions are melted or dissolved?

Answer 2

They conduct electricity due to free movement of ions

Question 3

What is covalent bonding?

Answer 3

When atoms share electrons

Question 4

What are the forces between molecules

Answer 4

Weak intermolecular forces because the molecules are easily parted from eachother

Question 5

Do substances made from simple molecules conduct electricity?

Answer 5

No as they haven’t got an overall electric charge

Question 6

Give 3 examples of giant covalent structures

Answer 6

Graphite
Diamond
Silicon dioxide

Question 7

What is another name for giant covalent structures

Answer 7

Macromolecules

Question 8

Describe the carbon atom structure in a diamond

Answer 8

Each carbon atom forms 4 covalent bonds in a very rigid and hard structure so diamond is very hard

Question 9

Describe the carbon atom structure in graphite

Answer 9

Each carbon atom bonds to 3 others forming layers. These layers are free to slide over eachother because there are no covalent bonds between the layers, and they have weak intermolecular forces

Question 10

Why do metals conduct heat and electricity

Answer 10

They have free electrons that can move around the metal

Question 11

Why can some metals be bend or shaped

Answer 11

The layers of atoms are free to slide over eachother making them malleable

Question 12

What is an alloy

Answer 12

A mixture of two metals in order to make is stronger, the different size of atoms distort the layers of the metal making it hard for atoms to slide over each other

Question 13

Describe thermosoftening polymers

Answer 13

Individually tangled chains of polymers held together by weak intermolecular forces

Question 14

Describe thermosetting polymers

Answer 14

Have strong intermolecular forces between the polymer chains, called cross links that hold the chains firmly together

Question 15

What is a nano particle

Answer 15

Particles in size of 1-100nm

Question 16

Nano particles have a high ….. To …. Ratio

Answer 16

Mano particles have a high surface are to volume ratio

Question 17

Name 3 ways in which nanoparticles can be used

Answer 17

Deodorants
Highly sensitive sensors
Suntan creams
New catalysts
Development of new computers
Tiny electric circuits for computer chips
Stronger lighter building material