Ch.2 - Atoms, Molecules & Ions
Chapter 2, Problem 11
The molecular illustration represents (LO 2.18) (a) a pure element (b) a mixture of two elements (c) a pure compound (d) a mixture of an element and a compound
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Related Practice
Textbook Question
Which sample has the greatest mass? (LO 2.16)
(a) 5.5 mol of C
(b) 2.1 mol of S
(c) 4.2 mol of Be
(d) 0.52 mol of Ag
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Textbook Question
How many atoms are present in 1.2 g of gold? (LO 2.16)
(a) 2.5 * 1021
(b) 1.4 * 1026
(c) 7.2 * 1023
(d) 3.7 * 1021
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Textbook Question
Bromine has two naturally occurring isotopes; 79Br (mass of 78.918) and 81Br (mass of 80.916). If the atomic weight of bromine is 79.904, predict the mass spectrum of a sample of bromine atoms. (LO 2.17) (a)
(b)
(c)
(d)
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Textbook Question
Which of the following compounds would you expect to have covalent bonds? (LO 2.20) (a) Na2O (b) PBr3 (c) CaBr2 (d) MgS
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Textbook Question
How many protons, neutrons, and electrons are in 107Ag+? (LO 2.21)
(a) protons = 47, neutrons = 60, electrons = 46
(b) protons = 47, neutrons = 107, electrons = 48
(c) protons = 60, neutrons = 47, electrons = 47
(d) protons = 47, neutrons = 107, electrons = 46
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Textbook Question
What is the correct formula for sodium phosphate? (LO 2.24) (a) Na3PO4 (b) Na3P (c) NaPO4 (d) Na(PO4)2
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