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Author Question: The energy (J) required for an electronic transition in a Bohr hydrogen atom from n = 1 to n = 3 is ... (Read 32 times)

daltonest1984

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on: Aug 27, 2018
The energy (J) required for an electronic transition in a Bohr hydrogen atom from n = 1 to n = 3 is ________ J.
 
  A) -8.90  10-1
  B) 3.00  10-19
  C) -3.00  10-19
  D) 1.94  10-18
  E) 8.90  10-1

Question 2

Consider an electrochemical cell based on the reaction: 2H+ (aq) + Sn (s)  Sn2+ (aq) + H2 (g) Which of the following actions would not change the measured cell potential?
 
  A) lowering the pH in the cathode compartment
  B) addition of more tin metal to the anode compartment
  C) increasing the tin (II) ion concentration in the anode compartment
  D) increasing the pressure of hydrogen gas in the cathode compartment
  E) Any of the above will change the measured cell potential.

Question 3

A 0.1 M solution of ________ has a pH of 7.0.
 
  A) Na2S
  B) KF
  C) NaNO3
  D) NH4Cl
  E) NaF
Chemistry: The Central Science ¦ Brown, LeMay, Bursten ¦ 14th Edition
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bitingbit

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Reply #1 on: Aug 27, 2018
Answer to Question 1

D

Answer to Question 2

B

Answer to Question 3

C


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