Chem for engineering - 1 . X20,62.96 X21,37.04...

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1. There are two isotopes of Element X. Their percent abundances and atomic masses are: X-20, 62.96% X-21, 37.04% Calculate the weighted average atomic mass in amu. Student Respons e Value Correct Answer Feedback A. 2037 B. 20.63 C. 20.37 100% D. 12.59 E. 20.50 Score: 1/1 2. What is the sum of the numbers of neutrons and electrons in the ion 210 Po 1- ? Student Response Value Correct Answer Answer: 211 100% 211 Score: 1/1 3. Consider the isotope bromine-81 ( 81 Br). Select the combination which lists the correct atomic number, number of neutrons, and mass number, respectively. Student Respons e Value Correct Answer Feedback A. 35, 46, 81 100% B. 35, 81, 46 C. 81, 46, 35 D. 46, 81, 35 E. none of these Score: 1/1
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4. In a hydrogen atom, from what energy level must an electron fall to the n = 3 level to give a line at 1.28 m in the infrared region? Student Respons e Value Correct Answer Feedback A. 2 B. 4 C. 5 100% D. 6 E. 7 Score: 1/1 5. What feature of an orbital is related to the angular momentum quantum number ( l )? Student Respons e Value Correct Answer Feedback A. the shape of the orbital 100% B. the number of electrons within an orbital C. the orientatio n of an orbital D. the relative size of the orbital E. None of these Score: 1/1 6.
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Give the formula and name of the compound formed from the following elements: a) rubidium and bromine; b) sulfur and barium; c) calcium and fluorine. Student Response Value Correct Answer Feedback A. RbBr Rubidium bromideBaS 2 Barium sulfideCaF 2 Calcium fluoride B. RbBr Rubidium bromideBa 2 S Barium sulfideCaF 2 Calcium fluoride C. RbBr Rubidium bromideBaS Barium sulfideCaF 2 Calcium fluoride 100% D. RbBr 2 Rubidium bromideBaS Barium sulfideCaF 2 Calcium fluoride E. RbBr Rubidium bromideBaS Barium sulfideCaF 2 Calcium difluoride Score: 1/1 7. How many chlorine atoms are present in 80.2 g of CCl 4 ? Enter your answer in scientific notation (1.23 x 10 4 = 1.23E4) using three significant figures. Do not enter units with your answer.
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