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Identify the element being oxidized in the following reaction. 4Al + 3O2 → 2Al2O3

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The substance (CH3CH2) 2NH is considered to be


A) a weak acid.
B) a weak base.
C) a strong acid.
D) a strong base.
E) neither acidic nor basic.

F) B) and E)
G) A) and E)

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What is the oxidation number of sulfur in sulfuric acid?


A) +1
B) +6
C) -2
D) -4
E) +4

F) B) and E)
G) None of the above

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Which of these chemical equations does not describe a redox reaction?


A) 2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(l)
B) 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
C) 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g)
D) 2KNO3(s) → 2KNO2(s) + O2(g)
E) 2LiOH(aq) + H2SO4(aq) → Li2SO4(aq) + 2H2O(l)

F) B) and E)
G) B) and C)

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