Chem for engineering

Chem for engineering - 1. There are two isotopes of Element...

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Unformatted text preview: 1. There are two isotopes of Element X. Their percent abundances and ato X-20, 62.96% X-21, 37.04% Calculate the weighted average atomic mass in amu. Student Response 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 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, r Student Response Value Correct Answer Feedback A. 35, 46, 81 100% Student Response Value Correct Answer Feedback B. 35, 81, 46 C. 81, 46, 35 D. 46, 81, 35 E. none of these Score: 1/1 4. In a hydrogen atom, from what energy level must an electron fall to the n m in the infrared region? Student Response 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 n Student Response Value Correct Answer Feedback A. the shape of the orbital 100% B. the number Student Response Value Correct Answer Feedback of electrons within an orbital C. the orientation of an orbital D. the relative size of the orbital E. None of these Score: 1/1 6. Give the formula and name of the compound formed from the following e 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 100% Student Response Value Correct Answer Feedback sulfideCaF 2 Calcium fluoride 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 answ 10 4 = 1.23E4) using three significant figures. Do not enter units with your Student Response Value Correct Answer Answer: 3.14E23 0% 1.25E24 (1.25 10 Score: 0/1 8....
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Chem for engineering - 1. There are two isotopes of Element...

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