Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chemistry > Extraction And Uses Of Metals > Flashcards

Extraction And Uses Of Metals Flashcards

You may prefer our related Brainscape-certified flashcards:
AP® Chemistry flashcards Periodic Table flashcards Chemistry 101 flashcards Organic Chemistry 101 flashcards
1
Q

The extraction of metals depends on…

A

Its position in the reactivity series and cost

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

Electrolysis is used for metals…

A

More reactive than zinc

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

Heating with Carbon or carbon monoxide (as a reducing agent) is used to separate metals…

A

Up to zinc

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

Aluminium is extracted from an ore called…

A

Bauxite

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

Bauxite is…

A

Impure aluminium oxide

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

The half equations for the extraction of aluminium are…

A

Al(3+) + 3e- = Al
(Aluminium ions are attracted to the cathode and reduced)
2O(2-) = O2 + 4e-
(Oxide ions are attracted to the anode and oxidised)

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

Melting aluminium oxide requires…

A

Extremely high temperatures

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

To lower the melting point, aluminium oxide is…

A

Dissolved in an aluminium compound called cryolite as a flux to lower its melting point

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

Because of high temperatures in electrolysis the Carbon anodes will…

A

Burn with with the oxygen produced to form Carbon dioxide, so they have to be replaced regularly

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

One problem with electrolysis is…

A

The cost. The electricity requires cells with currents up to 100 000A

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

Properties that make aluminium good in aircraft:

A

It resists corrosion due to its aluminium oxide coat
It has a low density
It is strong

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

Properties that make aluminium oxide good for saucepans

A

It remains shiny
It is a good conductor of heat
It resists corrosion
It has a low density

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

Iron is extracted from … In a …

A

Haematite, which contains Iron (III) oxide, in a blast furnace

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

Coke is…

A

Impure Carbon

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

Coke burns to form…

A

Carbon dioxide

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

Coke burning is a … Reaction, which …

A

Strongly exothermic reaction which heats the blast furnace

17
Q

The equation for Coke burning is…

A

C + O2 = CO2

18
Q

Carbon monoxide is the main … In a blast furnace

A

Reducing agent

19
Q

The equation for iron oxide reacting with Carbon monoxide is…

A

Fe2O3 + 3CO = 2Fe + 3CO2

20
Q

The equation for iron (III) oxide being reduced by Carbon is…

A

Fe2O3 + 3C = 2Fe + 3CO

21
Q

The heat of the furnace causes the limestone to…

A

Thermically decompose

22
Q

Limestone thermos lily decomposes to form…

A

Calcium oxide and Carbon dioxide

23
Q

The equation for limestone thermography decomposing is…

A

CaCO3 = CaO + CO2

24
Q

A blast furnace is hottest at the top/bottom

A

Bottom. 400 oC at the top, 1800 oC at the bottom

25
Q

One of the impurities found in haematite is…

A

Silicone dioxide SiO2

26
Q

Calcium oxide on the blast furnace reacts with…

A

Silicone dioxide SiO2

27
Q

When calcium oxide and silicone dioxide react they produce

A

Molten calcium silicate (slag)

28
Q

The equation for slag forming is…

A

SiO2 + CaO = CaSiO3

29
Q

Wrought iron is …% iron and is used for…

A

100% iron and is used for decorative work such as gates and railings as it is very soft

30
Q

Mild steel is …% … And is used for

A

0.25% Carbon and is used for nails, car bodies and ship building as it is tough and malleable

31
Q

High Carbon Steel is …% Carbon and is used for … As it is…

A

0.25 - 1.5% Carbon and is used for cutting tools as it is very hard

32
Q

Cast iron is …% … And is used for … As it is …

A

About 4% Carbon and is used for manhole covers, guttering and engine blocks as it is very brittle but strong

33
Q

Stainless steel is iron mixed with … And it is used for … As it is…

A

Chromium and nickel and is used for cutlery and cooking utensils as it resists rusting but is expensive

Chemistry (18 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions