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Exam 6: Oxidation-Reduction Reactions

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Question 31

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The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Based on this list, which element below would undergo oxidation most readily?

A) Ag
B) Al
C) Cu
D) Cd
E) Zn

F) A) and B)
G) A) and C)

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Question 32

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A partial activity series of metals is: Au < Ag < Cu < Pb < Sn. Which ion is most easily reduced: Au³⁺, Pb²⁺, Ag⁺?

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Question 33

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Which statement is true concerning an oxidation-reduction reaction?

What is the oxidation number of the arsenic atom in the AsO₄³ ion?

When organic compounds that contain sulfur undergo complete combustion with oxygen, one of the products is hydrogen sulfide.

KMnO₄ in acidic media is a powerful oxidizing agent, which is often used in redox titrations.

A solution was made by taking 2.500 g of KMnO₄ and dissolving it in enough water to make 1.000 liter of solution. This solution was used to titrate H₂C₂O₄·2H₂O, which can be readily obtained in high purity. In acidic media, the reaction is:2 MnO₄^-(aq)+ 5 H₂C₂O₄(aq)+ 6 H⁺ → 10 CO₂(g)+ 2 Mn²⁺(aq)+ 8 H₂O How many mL of this solution are required to titrate a 0.480 g sample of H₂C₂O₄·2H₂O? Hint: Remember to use moles as an intermediary when performing your stoichiometry calculations for the titration.

Three metallic elements, copper, magnesium and gold, can be distinguished from one another on the basis of how they react with two strong acids, HNO₃(aq)and HCl(aq). Which set below, using the abbreviations R (for reaction occurs)and NR (no reaction)correctly describes what occurs?

Balancing a redox reaction in acidic media is no different than balancing the same reaction in a basic media.

A partial activity series is: Au < Ag < Cu < H₂ < Pb < Sn < Co < Fe. Which metal will be produced when each of the following compounds reacts with Sn metal:Co(NO₃)₂(aq); Fe(NO₃)₂(aq); HNO₃(aq); Cu(NO₃)₂(aq); Sn(NO₃)₂(aq)?

When a metal is reacted with nitric acid, which element in nitric acid is reduced?

Which element would react most rapidly with water?

Which substance in the reaction 5 H₂O(l)+ 4 Cl₂(g)+ S₂O₃^2-(aq)→ 2 SO₄^2-(aq)+ 8 Cl^-(aq)+ 10 H⁺(aq)is the reducing agent?

When aluminum is exposed to the environment it does not corrode in the same way as iron. Which of the following best explains why? Hint: Look at the chemical properties of iron and aluminum.

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Which reaction below does not occur spontaneously upon mixing the reagents shown?

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Which reaction below occurs spontaneously upon mixing the reagents shown?

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Based on this list, which element below would undergo oxidation least readily?

Identify the reducing agent in the chemical reaction Cd + NiO₂ + 2H₂O → Cd(OH)₂ + Ni(OH)₂.

What two products are formed when CH₄ reacts with a very limited supply of molecular oxygen? Hint: Oxygen must be conserved in the products.

You can dissolve a penny using nitric acid, HNO₃. The reaction Cu(s) + 4 HNO₃(aq) $\rarr$ Cu(NO₃) ₂(aq) + 2 NO₂(g) + 2 H₂O(l) is used to dissolve copper metal. If there is 1.000 g of copper to be dissolved, and instructions say to use four times as much acid as the required amount, how many mL (to the nearest mL) of 15.0 M nitric acid would be required to dissolve the copper? Hint: Don't forget the coefficients in the balanced reaction above when performing your calculations with nitric acid.