C2.2 Structure and Properties Flashcards

1
Q

Why do ionic compounds have high melting and boiling points?

A

There are so many strong ionic bonds to break and to separate the ions, you have to overcome the forces of attraction. It takes a lot of energy.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Why can’t a solid ionic compound conduct electricity?

A

It’s in a fixed position and the ions can’t move around to conduct anything.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What forms of an ionic compund can conduct electricty?

A

molten and liquid because the particles can move around

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Do covalent bonds have low melting and boiling points?

A

yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Why do convalently bonded substance have low boiling and melting points?

A

They have weak intermolecular forces.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

why can’t simple molecules conduct electricity?

A

They have no overall charge so they can’t conduct electricty

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Properties of diamond

A

hard, high melting and boiling points and are insoluble in water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the forms of carbon?

A

diamond, graphite, graphene, silicon, buckminsterfullerene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Why are alloys harder than pure metals?

A

they are a mixture of metals so the sixe of the particles are different so they have no layers and they can’t slide over each other

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Example of a shape memory alloy

A

braces wire

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How to make Low Density Poly Ethene?

A

High pressure and oxygen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How to make High Density Poly Ethene?

A

use a catalyst at 50 degrees and high pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is a thermosoftening polymer?

A

a polymer that forms plastics which can be softened by heat, then remoulded into different shapes as they cool down and set

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are thermosetting polymers?

A

They are polymers that can form extensive cross-linking between chains. resulting in rigid materials which are heat-resisitant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Uses of nanoscience

A

sunscreen, cleaning glass, cosmetics, tumours, antibacterials

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Risks of nanoparticles

A

inhalation can damage the lungs, explode