Quiz 6 Sp21 CH302 Anderson 50710 50720 PDF

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Quiz 6 Sp21 CH302 Anderson 50710 50720...

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5/12/2021

Quiz 6: Sp21 CH302 Anderson 50710/50720

Quiz 6 Due May 6 at 6:45pm

Points 75

Questions 15

Available May 6 at 5pm - May 6 at 6:45pm about 2 hours

Time Limit 75 Minutes

This quiz was locked May 6 at 6:45pm.

Attempt History LATEST

Attempt

Time

Score

Attempt 1

70 minutes

8.33 out of 75

Score for this quiz: 8.33 out of 75 Submitted May 6 at 6:43pm This attempt took 70 minutes.

All standard potentials needed can be found either in the question or HERE (https://gchem.cm.utexas.edu/data/standard-potentials.php) on gchem.

0 / 5 pts

Question 1

If this galvanic cell is allowed to run for a while and the anode loses 8.00 g of mass, how much mass will the cathode gain? Round to the second decimal place (x.xx). In | In3+ || Cu2+ | Cu Reduction potential for In3+ /In is -0.34 V. Reduction potential for Cu2+ /Cu is +0.34 V.

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ou Answered

orrect Answers

Unanswered

Quiz 6: Sp21 CH302 Anderson 50710/50720

1.43

6.64 (with margin: 0.5)

Question 2

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Determine the Ecell for the galvanic cell shown below. Round to the fourth decimal place (x.xxxx)

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ou Answered

orrect Answers

0.0798 (with margin: 0.005)

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Question 3

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Your friend writes the shorthand and labels the cell diagram for an electrolytic cell based on silver and copper ions. She asks you to check it over before she turns it in. Which mistake did she make?

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ou Answered

Change the signs on the electrodes, otherwise it's correct.

orrect Answer

Change the names on the electrodes, otherwise it's correct.

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Question 4

Given this cell, calculate K for the reaction that is occurring. Fe (s) | Fe2+ (aq) || Cu 2+ (aq) | Cu (s) Reduction potential for Fe2+ /Fe is -0.44 V. Reduction potential for Cu2+ /Cu is +0.34 V. Choose your answer in two parts, as a coefficient and an exponent. For example, if your K value came out to be 1.23 × 1045, you would choose 1.23 as the coefficient and +45 as the exponent. Select the coefficient of K.

Select the subscript of K.

[ Select ]

[ Select ]

Answer 1: ou Answered

5.48

orrect Answer

2.34

Answer 2:

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orrect Answer

+26

ou Answered

+19

Unanswered

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Question 5

Scientists have discovered a new element and given it the symbol ‘R.’ This new element forms a polyatomic ion with oxygen and this polyatomic ion combines with Fe2+ to create the compound Fe(RO3 )2 (s). What is the oxidation number of the R atom in the solid? Enter your answer as a whole number (+/- X).

ou Answered

orrect Answers

5 (with margin: 0)

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Question 6

Which is the correct shorthand notation for a galvanic cell made utilizing these two half-reactions? Mn2+ (aq) + 2e− Pb4+ (aq) +2e−

Correct!

Mn (s) Pb 2+ (aq)

Mn | Mn2+ || Pb4+ , Pb2+ | Pt

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Question 7

Given this cell, calculate ∆Gº. Answer in kJ and round your answer to the nearest whole number and include the sign.

Cd(s) | Cd 2+(aq) || Ag +(aq) | Ag(s) Reduction potential for Cd2+ /Cd is -0.40 V. Reduction potential for Ag+ /Ag is +0.80 V.

ou Answered

orrect Answers

-173

-232 (with margin: 10)

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Question 8

Given this half reaction, which is true? NO (g) + 2H2O (ℓ)

ou Answered

NO3— (aq) + 4H + (aq) + 3e —

Hydrogen is being reduced.

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orrect Answer

Unanswered

Quiz 6: Sp21 CH302 Anderson 50710/50720

Nitrogen is being oxidized.

Question 9

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A thief is trying to hide a small golden statue they stole by plating solid copper from a CuSO4 solution over it to disguise the statue. In order to do so, they will need to plate out 125 grams of copper onto the statue. If they have a current of 4 amps, how long will it take them to cover the statue? Answer in hours and round to the first decimal place.

ou Answered

orrect Answers

26.4 (with margin: 0.4)

Question 10

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The police arrest the thief and recover the copper-covered golden statue. They ask you how to remove the copper plating from the statue without damaging the gold underneath. You realize that if the statue is used as the anode in a galvanic cell and you choose the other half-cell carefully, the reaction will stop once the copper is used up and will leave the gold unharmed. Which one of the reduction half-cells below will remove the solid copper without damaging the gold?

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orrect Answer

|| Fe 3+, Fe 2+ | Pt

ou Answered

None of these reactions work.

Question 11

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A labmate asks you what the difference is between an electrolytic cell and a galvanic cell. Select ALL of the correct answers from the list below:

orrect Answer In an electrolytic cell, a nonspontaneous reaction is being forced to occur. In a galvanic cell, the reaction is spontaneous. orrect Answer An electrolytic cell has a negative E cell and a galvanic cell has a positive Ecell.

Correct! The anode in an electrolytic cell is (+) and the anode in a galvanic cell is (–).

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Question 12

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Which of the following will spontaneously reduce Au3+ but not Co2+ ?

orrect Answer

Cu

ou Answered

Pb4+

Question 13

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Given this cell, calculate the missing concentration if the Ecell = 0.173 V. The E°cell for this reaction is 0.145 V. Answer in M and round to the second decimal place (x.xx). Pt (s) | Fe 2+ (? M), Fe 3+ (0.02 M) || Pd 2+ (0.05 M) | Pd (s)

ou Answered

orrect Answers

0.01

0.27 (with margin: 0.01)

Question 14

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Select ALL that are false statements. https://utexas.instructure.com/courses/1297538/quizzes/1538403?module_item_id=10985188

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orrect Answer The negative ion from the salt bridge moves into the solution where reduction is occurring.

Correct!

Anions from the salt bridge are oxidized at the anode.

Correct!

In shorthand notation phase boundaries are represented by a comma.

ou Answered Electrodes are always the first and last species listed in shorthand notation when reading left to right.

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Question 15

Balance the following redox reaction in basic solution. What is the coefficient on the H 2O and is it a reactant or a product? Bi(s) + NO3 — (aq) → Bi3+(aq) + NO2— (aq)

orrect Answer

3, reactant

ou Answered

3, product

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This is the end of the quiz. If you are finished, hit submit.

Quiz Score: 8.33 out of 75

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