Extraction of Aluminum

Extraction of Aluminum:

Aluminum is highly reactive metal and it will be electrolyzed.

Aluminum has many useful properties like:

Low density

Conduct heat & electricity

Resistance to corrosion (as forms Aluminum oxide layer on extraction that protects it from corrosion)

Getting the Ore:

Aluminum is extracted mainly from its ore called Bauxite (Al2O3)

Electrolysis of Aluminum oxide

Aluminum is melted & then electrolyzed.

To save energy, Aluminum oxide is dissolved in a chemical Cryolite (Na3AlF4)

At the cathode:

    Al3+        +     3e-     à    Al

At the anode:

    2O2-        -     4e-     à    O2

This oxygen reacts with hot carbon anodes making carbon dioxide gas & burns away. This needs to be replaced.

 

                   Class Assessment

1.  Aluminum is highly reactive metal. T

2.  Oxygen reacts with hot carbon anodes     making carbon dioxide gas & burns away. T

3.  Aluminum is extracted mainly from its ore called Bauxite (Al2O3). T

4.  Aluminum oxide is dissolved in a chemical Cryolite (Na3AlF4). T

 

 

 

Comments

Post a Comment

Popular posts from this blog

Revision work for chemistry Grade-8 2021.

Revision work for chemistry Grade-8  2021.  Chose the best. 1.     In a brewery the Fermentation is carried out          in ------------------- vats. A.    Small B.    Large C.    Medium D.    All 2.     Drugs are substances which affect          the ----------------------- in some way. A.    Plastic B.    Rocks C.    Body D.    None of them 3.     I n the 1950s a new drug called Paracetamol was           introduced. A.    Paracetamol B.    Placebo C.    Emulsion D.    Fermentation 4.     An Emulsion is an example of a ---------------- . A.    Emulsion B.    Fermentation C.    Placebo D.    Colloidal 5.     Detergents are ------------------ agents. A.   ...
Read more

Answer Key for Grade-6 Social Studies 2nd final Term Examination 2021

Answer Key for Grade-6  Social Studies    2nd final Term Examination   2021 Page 85 Exercise 1:  What is the difference between climate and weather? Explain. The weather changes within a short time (24 hours or less), and it changes from day to day. While the climate is constant over a long period (it does not change from one day to another), and it characterizes the general atmosphere of a place over a long period. Exercise 2:  Name the four elements that affect the change of climate from one place to another or from one season to the other. 1. Temperature (heat) 2. Atmospheric pressure 3. Precipitation 4. Wind Exercise 3:  Write “true” or “false”. 1. Wind moves all the time above the surface of the Earth.  T 2. A barometer measures temperature.  F 3. Temperature refers to heat and the sun might be a possible source of heat.  T 4. When I say it’s going to be cloudy today, the I am referring to the weather.  T Page 100 Exercise...
Read more

Define Cracking.

Image
Define Cracking. Cracking : The process by which heavy hydrocarbon molecules are broken up into lighter molecules. Cracking is the name given to breaking up large hydrocarbon molecules into smaller and more useful bits. This is achieved by using pressures ,  temperatures  and catalyst.
Read more