Chem Final Exam

Chem Final Exam - ViewAttempt1of1 Title: Started:...

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View Attempt 1 of 1 Title: FE Started: December 8, 2011 3:55 PM Submitted: December 8, 2011 5:22 PM Time spent: 01:27:06 Total score: 28/30 = 93.3333% Total score adjusted by 0.0 Maximum possible score: 30 1. An element with two isotopes (approximately 45% and 55% ab 161.71 u. One of the isotopes has a mass of 159 u. Which choic second isotope? Student Response A.159 B.157 C.164 D.158 E.162 Score: 1/1 2. How many neutrons are there in the nucleus of a 232 Th atom? Student Response A.232 B.90 C.81 D.151 E.142 Score: 1/1 3. Which of these have the same number of electrons? I. Br - , Kr, Sr 2+ II. C, N - , O 2- III. Mg 2+ , Ca 2+ , Sr 2+ IV. O 2- , O, O 2+ V. Ag + , Cd 2+ , Pd
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Student Response A.I, II B.I, V C.I, III, IV D.II, III, V E.I, III, IV, V Score: 1/1 4. What is the wavelength (nm) of a photon emitted by a hydrogen Calculate to 1 decimal place and do not include units. Student Response Answer: 384 Score: 1/1 5. Which is not a possible m l value for an orbital that has the follo l = 2 Student Response A.+3 B.–1 C.+2 D.none of these Score: 1/1 6. Give the name and formula of the compound whose molecules atoms. Student Response A.sulfur tetrafluorite; (SF 2 ) 2 B.disulfur fluoride; S 2 F 4
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Student Response C.disulfur tetrafluorate; S 2 F 4 D.disulfur tetrafluoride; S 2 F 4 E.disulfur tetrafluoride; (SF 4 ) 2 Score: 1/1 7. How many chlorine atoms are present in 45.6 g of chloroform, Enter your answer in scientific notation (1.23 x 10 4 = 1.23E4) u with your answer. Student Response Answer: 6.90e23 Score: 1/1 8. Choose the correct Lewis electron-dot symbol for the atom belo
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Chem Final Exam - ViewAttempt1of1 Title: Started:...

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