Sprint 6:55 PM 1311 Practice test -4.docx CHEM 1311 Practice test-04 1) Bohr\'s

Question

Sprint 6:55 PM 1311 Practice test -4.docx CHEM 1311 Practice test-04 1) Bohr's model of the atoms included the idea(s) that: A) The electron can have only certain energies B) To move an electron from lower shell (close to the nucleus) to a higher shel it must absorb energy C) Returning electrons from higher shell to a lower shell (close to the nucleus) will always emit the excess energy as light D) Both (B) and (C) E) All (A). (B) and (C) is correct The diagram shown below shows the allowed energy levels for each orbital in a hydrogen atom. Answer the questions 2-5 based on the following diagram E-2093 x1018 E-2.043 x 1018 E-1938 x 10-18 J E-1.63 x 10-18 -54321 2) How much energy would be released as an electron jumps from level n-4 to n-3? A) 3.981 x10 J B) 3.578x10 J C) 1.050x10"J D)0J E) None of above 3) What frequency of light would be emitted in the transition in question (2)? (Use E-h X v: Where E -energy(J), v frequency (Hz) and h Planks constant 6.626 x10J.s) 1) 6.0081 X 10" Hz 2) 5.3983 X 10 Hz 3) 1.58 X 10" Hz 4) 0 Hz 5) None of above 4) How much energy is required to jump an electron from level n-1 to n-2 a Open With Print

Explanation / Answer

I am solving the first four problems as per Chegg guidelines, post multiple question to get the remaining answers

Q1)

Correct answer is Option E (All are correct)

Q2)

Energy Required = E3 - E4 (will be negative of the answer)

=> (2.043 - 1.938) * 10^(-19) J

=> 1.050 * 10^(-19) J

Option C

3)

1.050 * 10^(-19) = h * frequency

frequency = 1.050 * 10^(-19)/6.626 * 10^(-34) = 1.58 * 10^(14) Hz

Hence the correct answer is Option 3

4)

Energy Required = E1 - E2 (will be negative of the answer)

=> 1.635 * 10^(-18) J

Correct answer is Option B

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