CC Pretest 2

# CC Pretest 2 - The element zinc consists of five isotopes...

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The element zinc consists of five isotopes with masses 63.929, 65.926, 66.927, 67.925, and 69.925 amu. The relative abundances of these five isotopes are 48.89, 27.81, 4.110, 18.57, and 0.62 percent, respectively. From these data calculate the average atomic mass of zinc. WebBook Section 2.4 Selected Answer: 66.93 amu Correct Answer: 65.39 amu Feedback : This is a weighted average calculation.

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Question 2 Multiple Choice 5 of 5 points If 60 g of carbon combine with 10 g of hydrogen to form a compound, this means that any sample of this compound will contain ___ part(s) carbon and ___ part(s) hydrogen by mass. WebBook Section 2.1 Selected Answer: 6, 1 Correct Answer: 6, 1 Feedback : The 60 g:10 g is the same as 6:1. Question 3 Multiple Choice 0 of 5 points How many neutrons are there in the nucleus of a 108 Ag atom? WebBook Section 2.3 Selected Answer: 108 Correct Answer: 61 Feedback : Use the mass number and atomic number to calculate the number of neutrons. Question 4 Multiple Choice 0 of 5 points What is the mass number of an isotope of mercury that has 122 neutrons? WebBook Section 2.3 Selected Answer: 122 Correct Answer: 202 Feedback : The mass number = number of protons + number of neutrons. Question 5 Multiple Choice 5 of 5 points All of the following except ________ are metalloids. WebBook Section 2.5
Question 5 Multiple Choice 5 of 5 points Selected Answer: Al Correct Answer: Al Feedback : Aluminum is a metal. Question 6 Multiple Choice 5 of 5 points An elemental ion has 34 protons, 36 electrons, and 44 neutrons. Which isotope is it? WebBook Section 2.7 Selected Answer: Correct Answer: Feedback : There are two more electrons than protons, resulting in a 2- charge. Question 7 Multiple Choice 5 of 5 points Which one of the following is incorrectly labeled? WebBook Section 2.5 Selected Answer: Mg; alkali metal Correct Answer: Mg; alkali metal Feedback : Mg is an alkaline earth metal. Question 8 Multiple Choice 5 of 5 points How many protons and neutrons are there in ? WebBook Section 2.3

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Question 8 Multiple Choice 5 of 5 points Selected Answer: 43 protons and 55 neutrons Correct Answer: 43 protons and 55 neutrons Feedback : The atomic number is the lower number and equals the number of protons. The number of neutrons = mass number - the number of protons. Question 9 Multiple Choice 0 of 5 points Which of the following statements is true for neutral atoms? WebBook Section 2.3 Selected Answer: The number of neutrons in a neutr always equal the number of protons Correct Answer: It is possible for neutral atoms of d to have the same number of neutron Feedback : Protons and electrons are the only charged particles in an atom. Question 10 Multiple Choice 0 of 5 points Which pair of symbols below represents isotopes? WebBook Section 2.3
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## This note was uploaded on 02/08/2010 for the course CHEMISTRY 124 taught by Professor Chm during the Spring '09 term at Holyoke CC.

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CC Pretest 2 - The element zinc consists of five isotopes...

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