Aluminum is the most abundant metal in the earth's crust. It is also a common household utensi metal. The extraction of Aluminum from its ore is expensive because the metallurgy uses a very high amount of electricity. The extraction of Aluminum metal takes place in a number of steps, which may be summarized below. Step 1: Washing and mechanical processes employed to the ore to remove basic impurities. Step 2: Conversion of Aluminum ore (Bauxite) to powdered Alumina (Al20) by reaction with concentrated NaOH solution. Step 3: Dissolving Alumina in molten Cryolite(Na;AIF6) Step 4: Electrolytic refining of the solution at step 2. (Diagram below) to form pure Aluminum metal. Step 5: Collecting pure molten Aluminum at the cathode, which change later to solid Aluminum metal. graphite cathode lining graphite anode solution of bauxite in cryolite molten aluminium O www.science aid.net As you observed, many changes are taking place in different steps for the above extraction process. Classify them as physical or chemical change and explain why? a) Step 1 b) Step 2 c) Step 3 d) Step 4 d) Step 5

Aluminum is the most abundant metal in the earth's crust. It is also a common household utensi metal. The extraction of Aluminum from its ore is expensive because the metallurgy uses a very high amount of electricity. The extraction of Aluminum metal takes place in a number of steps, which may be summarized below. Step 1: Washing and mechanical processes employed to the ore to remove basic impurities. Step 2: Conversion of Aluminum ore (Bauxite) to powdered Alumina (Al20) by reaction with concentrated NaOH solution. Step 3: Dissolving Alumina in molten Cryolite(Na;AIF6) Step 4: Electrolytic refining of the solution at step 2. (Diagram below) to form pure Aluminum metal. Step 5: Collecting pure molten Aluminum at the cathode, which change later to solid Aluminum metal. graphite cathode lining graphite anode solution of bauxite in cryolite molten aluminium O www.science aid.net As you observed, many changes are taking place in different steps for the above extraction process. Classify them as physical or chemical change and explain why? a) Step 1 b) Step 2 c) Step 3 d) Step 4 d) Step 5

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Aluminum is the most abundant metal in the earth's crust. It is also a common household utensi
metal. The extraction of Aluminum from its ore is expensive because the metallurgy uses a very
high amount of electricity. The extraction of Aluminum metal takes place in a number of steps,
which may be summarized below.
Step 1: Washing and mechanical processes employed to the ore to remove basic impurities.
Step 2: Conversion of Aluminum ore (Bauxite) to powdered Alumina (Al20) by reaction with
concentrated NaOH solution.
Step 3: Dissolving Alumina in molten Cryolite(Na;AIF6)
Step 4: Electrolytic refining of the solution at step 2. (Diagram below) to form pure Aluminum
metal.
Step 5: Collecting pure molten Aluminum at the cathode, which change later to solid Aluminum
metal.
graphite cathode
lining
graphite anode
solution of
bauxite in
cryolite
molten aluminium
O www.science aid.net
As you observed, many changes are taking place in different steps for the above extraction
process. Classify them as physical or chemical change and explain why?
a) Step 1
b) Step 2
c) Step 3
d) Step 4
d) Step 5

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