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Chapter 1: Problem 11
Classify each of these substances as an element or a compound: (a) hydrogen, (b) water, (c) gold, (d) sugar.
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How many seconds are in a solar year \((365.24\) days \() ?\)
A 250 -mL glass bottle was filled with 242 mL of water at \(20^{\circ} \mathrm{C}\) and tightly capped. It was then left outdoors overnight, where the average temperature was \(-5^{\circ} \mathrm{C}\). Predict what would happen. The density of water at \(20^{\circ} \mathrm{C}\) is \(0.998 \mathrm{~g} / \mathrm{cm}^{3}\) and that of ice at \(-5^{\circ} \mathrm{C}\) is \(0.916 \mathrm{~g} / \mathrm{cm}^{3}\)
Magnesium (Mg) is a valuable metal used in alloys, in batteries, and in chemical synthesis. It is obtained mostly from seawater, which contains about \(1.3 \mathrm{~g}\) of Mg for every kilogram of seawater. Calculate the volume of seawater (in liters) needed to extract \(8.0 \times 10^{4}\) tons of \(\mathrm{Mg}\), which is roughly the annual production in the United States. (Density of seawater = \(1.03 \mathrm{~g} / \mathrm{mL} .)\)
A silver \((\mathrm{Ag})\) object weighing \(194.3 \mathrm{~g}\) is placed in a graduated cylinder containing \(242.0 \mathrm{~mL}\) of water. The volume of water now reads \(260.5 \mathrm{~mL}\). From these data calculate the density of silver.
Convert these to nonscientific notation. (a) \(3.256 \times\) \(10^{-5},(b) 6.03 \times 10^{6}\)
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