Chemistry- Making use of metals

HideShow resource information
  • Created by: Kitsune
  • Created on: 16-08-16 02:45
Name the unreactive metals.
Silver, gold, platinum
1 of 59
How do uncreative metals occur?
In their native form
2 of 59
What is the Earth's crust daily made up of?
45% oxygen, 27 % silicon, 8% aluminium
3 of 59
What makes up silica?
Oxygen and silicon
4 of 59
What is the most abundant metal?
5 of 59
Name 4 precious metals
Gold, silver, platinum, palladium
6 of 59
What is an ore?
The rock from which the metal is obtained
7 of 59
How do you call an ore that has little useful metal?
Low grade ore
8 of 59
What does the extraction of a metal depend on?
Its reactivity
9 of 59
What is the method of extraction before carbon?
10 of 59
What is the method of extraction between hydrogen and carbon?
Heating with carbon or carbon oxide
11 of 59
What is the method of extraction after hydrogen?
There isn't any because metals are in their native form
12 of 59
How is the zinc ore called?
Zinc blende
13 of 59
What are the uses of zinc?
Galvanising, sacrificial protection, alloys, batteries
14 of 59
Describe how zinc is extracted from its ore.
Zinc ore is mainly zinc sulfide. It is roasted in air => zinc oxide+sulfur dioxide. Zinc oxide is reduced by using carbon monoxide or by electrolysis.
15 of 59
How is zinc obtained using carbon monoxide?
The reaction is carried out in a blast furnace. Zinc and carbon dioxide are produced. Fine mixture contains zinc and **** of impurities. Zinc is separated by fractional distillation.
16 of 59
How is zinc obtained using electrolysis?
Zinc oxide is dissolved in dilute sulfuric acid (compound must be either melted or in a solution but it has a hight melting point and it's insoluble in water). ZnO neutralises acid=> solution of ZnSO4. Electrolysis= Zn at cathode.
17 of 59
What is the iron ore called?
18 of 59
What is use to extract iron?
Blast furnace
19 of 59
What mixture is added to the furnace?
The charge
20 of 59
What's in the charge?
Hematite, limestone and coke
21 of 59
What is limestone?
Calcium carbonate
22 of 59
What is coke?
Made from coal and is almost pure carbon
23 of 59
What are the three reactions in iron extraction?
C+O2=CO2; C+CO2=2CO; Fe2O3+3CO=2Fe+3CO2
24 of 59
What is stage one in the blast furnace?
The blast of hot air makes the coke burn, giving off heat. Carbon is oxidised
25 of 59
What is stage two in the blast furnace?
Carbon monoxide is made. Carbon dioxide is reduced as it reacts with more coke. Reaction is endothermic.
26 of 59
What is stage three in the blast furnace?
Iron oxide is reduced and carbon monoxide is oxidised. Iron trickles at the bottom of the furnace.
27 of 59
What is limestone for?
It breaks down in the heat of the furnace CaCO3=CaO+CO2. CaO reacts with sand (silica) and forms calcium silicate, which runs down the furnace and floats on the iron
28 of 59
What are the waste gases?
Hot carbon dioxide and nitrogen come out from top of furnace. Heat is transferred from them to heat incoming blast of air.
29 of 59
What is the iron from blast furnace called?
Pig iron
30 of 59
What is cast iron?
Iron from the blast furnace that is run into holds to harden. It is very brittle because of its high carbon concentration
31 of 59
What is the aluminium ore called?
32 of 59
What colour is alumina and what is it?
It's aluminium oxide that is obtained after removing impurities and it's white
33 of 59
Describe the tank where electrolysis go alumina happens.
It's large and out of steel. It is lied with carbon that acts as a cathode. Big blocks of carbon hang in the middle of the tank as anode
34 of 59
Why is alumina dissolved in cryolite?
Because it has a very high melting point of 2045. It would be impossible to keep the tank that hot.
35 of 59
What is alumina dissolved in?
Cryolite (950 degrees), sodium aluminium fluoride
36 of 59
What happens at cathode during electrolysis of alumina?
Aluminium ions gain electrons and aluminium drops to the bottom of the cell
37 of 59
What happens at anode during electrolysis of alumina?
Oxygen ions lose electrons. Oxygen gass bubbles off and reacts with anode
38 of 59
Why do carbon anodes get eaten away during electrolysis of alumina?
Because oxygen reacts with them forming carbon dioxide
39 of 59
What colour is aluminium?
Bluish-silver, shiny
40 of 59
Is aluminium dangerous?
No, it's non toxic
41 of 59
How is aluminium used and why?
Overhead electricity cables- good conductor, ductile, resists corrosion. Cooking foil- non-toxic, no corrosion. Coating on CDs- shiny surface that reflects laser.
42 of 59
How is copper used and why?
Electrical wiring- great conductor, ductile. Saucepans- malleable, unreactive, tough, conducts
43 of 59
How is zinc used and why?
Torch batteries- gives a current. Galvanising- resists corrosion, sacrificial protection
44 of 59
What does turning a metal in an alloy do?
It improves its properties and makes it more useful
45 of 59
What is the composition of brass?
70% copper+ 30% zinc
46 of 59
Where is brass used?
Musical instruments, door knobs
47 of 59
What is the composition of aluminium alloy?
90.25 % aluminium+ 6% zinc+ 2.5% magnesium
48 of 59
Why does iron need to be turned into an alloy?
Because it's soft and it rusts
49 of 59
What is the composition of mild steel?
99.7% iron + 0.3% carbon
50 of 59
Does mild steel corrode?
51 of 59
What are the uses of mild steel?
Buildings, ships, car bodies, machinery
52 of 59
What is the composition of stainless steel?
70% iron + 20% chromium+ 10% nickel
53 of 59
What are the properties of stainless steel?
Hard, rustproof
54 of 59
What are the uses of stainless steel?
Cutlery, equipment in machine factories
55 of 59
How is lime, calcium oxide, also called?
56 of 59
What are steels made from?
Molten iron from blast furnace
57 of 59
How are unwanted impurities removed in making steel?
Molten iron is poured into a basic oxygen converter where oxygen reacts with carbon and sulfur to form CO2 and SO2. O2 reacts with phosphorus to form P2O5. CaO is added. It reacts with SiO2 and P2O5 since they are acidic= > ****
58 of 59
What can too much carbon do to steel?
Make it brittle and hard to shape
59 of 59

Other cards in this set

Card 2


How do uncreative metals occur?


In their native form

Card 3


What is the Earth's crust daily made up of?


Preview of the front of card 3

Card 4


What makes up silica?


Preview of the front of card 4

Card 5


What is the most abundant metal?


Preview of the front of card 5
View more cards


No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Metals resources »