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A uranium nuclear fission reactor that attempts to operate without a moderator would
A. suffer core meltdown.
B. not require uranium enrichment.
C. produce too much energy.
D. produce very little energy.
Aluminium is an important metal to modern society.
Aluminium is often used to produce lightweight alloys for use in the aerospace industry.
a. (i) Describe the production of aluminium from its purified ore. Explain the role of cryolite and deduce the equations for the reactions occurring at the two electrodes.
Production of aluminium:
Role of cryolite:
Negative electrode (cathode):
Positive electrode (anode):
(ii) Outline why aluminium was not available in large quantities before 1900. [5]
b. (i) State one advantage of using an alloy rather than the pure metal.
(ii) Outline why the range of metals alloyed with aluminium for this use is very limited. [2]
c. Suggest one possible environmental impact that can result from the large-scale production of aluminium. [1]
Consider a geometric sequence where the first term is 768 and the second term is 576.
Find the least value of such that the th term of the sequence is less than 7.