Unit 2 Topic 7 Materials Flashcards Preview

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Flashcards in Unit 2 Topic 7 Materials Deck (36):
1

Why nanoparticles have different properties to larger particles?

This is because they have a higher surface area to volume ratio

2

Give use for gold nanoparticles?

Catalysts to convert carbon monoxide in to carbon dioxide

3

Give 3 properties of silver nanoparticles?

Antibacterial
Anti fungal
Anti viral

4

Give 2 uses of carbon nano tubes?

- Mini electronic devices
- Smaller faster computers

5

How can nanoparticles be used as coating?

Thin layers of scratch resistant polymers can be used to protect lenses

6

Give 2 ways of extracting metals from ore?

Electrolysis
Chemical reduction

7

What is electrolysis?

The breaking down of compounds in to simpler substances using electric current

8

What is an electrolyte?

An ionic compound that's been melted or dissolved

9

What is a cathode?

The electrode attached to the negative pole

10

What is an anode?

The electrode attached to the positive pole

11

What is an electrode?

Metal or Graphite rods placed in to liquid and connected to a supply of electricity

12

Which electrode are anions attracted to?

Anode

13

Which electrode are cations attracted to?

Cathode

14

Give an observation of pure lead produced at the cathode after electrolysis?

Silvery bead

15

Give a observation of pure bromine produced at anode?

Brown gas

16

Give an observation of pure lithium that forms at cathode?

Grey liquid

17

Give an observation of pure chlorine produced at anode?

Pale green gas

18

How is Aluminium manufactured?

Electrolysis of Aluminium ore (Bauxite)

19

What is Bauxite?

Aluminium ore, which is Aluminium Oxide

20

What temperature is electrolysis of Aluminium carried out at?

955°C

21

Give 2 purposes of cryolite?

Lowers melting point of bauxite
Allows mixture of molten liquids to conduct electricity

22

Give 2 reasons to recycle aluminium?

Most cost effective metal to recycle
Recycling aluminium requires only 5% of energy required to manufacture aluminium

23

How is Iron extracted from its ore?

Blast Furnace (Chemical Reduction)

24

What is Iron ore also known as?

Haematite

25

Give the 3 stages of the extraction of Iron from its ore?

- 1. Formation of reducing agent ( Carbon Monoxide)
- 2. Reduction of iron oxide to iron
- 3. Removal of impurity

26

Give equations of all the reactions in extraction of iron?

Stage 1:
- C + O2 ---> CO2
- CO2 + C ---> CO

Stage 2:
- Fe2O3 + 3CO ---> 2 Fe + 3CO2

Stage 3:
- CaCO3 ---> CaO + CO2
- CaO + SiO2 ---> CaSiO3

27

What 3 reactants are used in extraction of iron?

Iron ore ( Haematite)
Limestone
Coke ( Carbon)

28

Why is Limestone used in extraction of iron?

It thermally decomposes to Calcium Oxide, which then reacts with the sand impurity in iron ore, Silicon Dioxide. This forms Calcium Silicate, which is also known as slag, which then floats on top of the pure iron as it is less dense

29

What is Calcium silicate also known as?

Slag

30

Give 2 uses of slag?

Build roads
Build foundations for buildings

31

Give 2 ways in which production of iron helps the economy?

Provides jobs
Provides exports

32

Give 3 environmental problems with production of iron?

Air pollution
Noise pollution
Unsightly slag heaps

33

Give 1 disadvantage and 2 advantages of recycling the raw materials used in iron production?

- Sorting recycled materials is expensive

- Less energy used
- Saves resources

34

Give 2 disadvantages and 1 advantage of disposing or incinerating materials?

- Toxic / polluting products released in to atmosphere
- Landfill wastes land

- Heat energy from incineration can be harnessed to generate electricity

35

Give 2 disadvantages and 1 advantage of producing new materials?

- More mining and drilling for materials
- More pollution

- More jobs created

36

What is nanotechnology?

The study of atoms and molecules