CHEM 121 Exam 3 chapters, 6-10, 1205-2016 Name (Please Print clea MULTIPLE CHOIC
ID: 1066163 • Letter: C
Question
CHEM 121 Exam 3 chapters, 6-10, 1205-2016 Name (Please Print clea MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. The first 21 questions 1) of the transitions in the hydrogen atom, the transtion results in the absorption of the A) n 1 n 6 photon. B) n 6 n 1 C) n 6 n 3 D) n 3 In 6 E) n 1 n a 4 of of the following equations shows an incorrect relationship between pressuresgiveninterms different A) 1.20 atm 122 kPa B) 152 mm Hg 2.03 x 104 Pa C) 0.760 atm 578 mm Hg D) 1.00 torr 2.00 mm Hg E) 1.00 atm 760 torr 3) The ground-state electron configuration of the element is Kr15s14d5. A) Nb B) Mo C) Cr D) Mn E) Tc 4) The wavelength of light that has a frequency of 1.20 x 1013 s 1 is m. A) 25.0 B) 2.50 x 10-5 C) 0.0400 D) 12.0 E) 2.5 5) Which equation correctly represents the first ionization of calcium? A) ca (g) cat (g) er B) Ca (g) Ca (g) er C) Ca (g) er Car (g) Ca (g) er D) Ca (g) Ca (g) E) at (g) eExplanation / Answer
1. Answer is B.n = 6 to 1
When dealing with the highest emission in Hydrogen, you are trying to look for the largest difference between the first and the second. You are also looking for a lowering in the energy level.
2. Answer is option D
1 torr = 2 mmHg , the correct converson is 1 mmHg = 1 torr.
3. Answer is Mo - Molebdenum
4. Answer is B 2.5 * 10- 5 m
Frequency = c/f
C - velocity of light = 3 * 108 m/s
Frequency = 3 * 108/1.2*1013
= 2.5 * 10-5m
5. Answer is A.
Ca = Ca+ + e
Calcium donates one electron and attain stability . hence Ca has one possitive charge.