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Chapter 1: Q88E (page 9)
Question: Osmium is one of the densest elements known. What is its density if 2.72g has a volume of 0.121 cm3?
22.5 g/ cm3 is the density.
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Question:Which of the following has two unpaired electrons?
(a) Mg
(b) Si
(c) S
(d) Both Mg and S
(e) Both Si and S.
Question:Using complete subshell notation (1s22s22p6, and so forth), predict the electron configurations of the following
ions.
(a) N3–
(b) Ca2+
(c) S–
(d) Cs2+
(e) Cr2+
(f) Gd3+
Which produces more heat?
\({\bf{Os}}\left( {\bf{s}} \right) \to {\bf{2}}{{\bf{O}}_{\bf{2}}}\left( {\bf{g}} \right) \to {\bf{Os}}{{\bf{O}}_{\bf{4}}}\left( {\bf{s}} \right)\)
or
\({\bf{Os}}\left( {\bf{s}} \right) \to {\bf{2}}{{\bf{O}}_{\bf{2}}}\left( {\bf{g}} \right) \to {\bf{Os}}{{\bf{O}}_{\bf{4}}}\left( {\bf{g}} \right)\)
for the phase change \({\bf{Os}}{{\bf{O}}_{\bf{4}}}\left( {\bf{s}} \right) \to {\bf{Os}}{{\bf{O}}_{\bf{4}}}\left( {\bf{g}} \right){\bf{ \Delta H = 56}}{\bf{.4 kJ}}\)
What is the density of a liquid with a mass of 31.1415 g and a volume of 30.13 cm³?
Classify the following sets of measurements as accurate, precise, both, or neither.
(a) Checking for consistency in the weight of chocolate chip cookies: 17.27 g, 13.05 g, 19.46 g, 16.92 g
(b) Testing the volume of a batch of 25-mL pipettes: 27.02 mL, 26.99 mL, 26.97 mL, 27.01 mL
(c) Determining the purity of gold: 99.9999%, 99.9998%, 99.9998%, 99.9999%
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