Chem quiz – Flashcards
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Under which conditions are gases most soluble in water?
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high pressure and low temperature
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Based on Reference Table G, which salt solution could contain 42 grams of solute per 100 grams of water at 40°C?
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an unsaturated solution of NH4Cl
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How many grams of NaNO3 would have to be added to 100. grams of water at 45°C to make a saturated solution of this salt?
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110
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According to Reference Table F, which of the following compounds will form a saturated solution that is most dilute?
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Calcium Carbonate
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A solution containing 60 grams of NaNO3 completely dissolved in 50. grams of water at 50°C is classified as being
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Supersaturated
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According to Reference Table G, which of the following saturated solutions is the most concentrated?
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KNO3 at 70°C
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According to Reference Table G, a temperature change from 60°C to 90°C has the least effect on the solubility of
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SO2
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According to Reference Table G, which compound's solubility decreases most rapidly when the temperature increases from 50°C to 70° C?
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NH3
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In an aqueous solution of an ionic salt, the oxygen atom of the water molecule is attracted to the
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positive ion of the salt, due to oxygen's partial negative charge
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In aqueous solution, a chloride ion is attracted to which end of the water molecule?
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the hydrogen end, which is the positive pole
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According to Reference Table G, which of these substances is most soluble at 60°C?
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NH4Cl
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What occurs when NaCl(s ) is added to water?
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The boiling point of the solution increases, and the freezing point of the solution decreases
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At STP, which of these substances is most soluble in H2O?
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HCl
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The solubility of KClO3(s) in water increases as the
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temperature of the solution increases
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A student adds solid KCl to water in a flask. The flask is sealed with a stopper and thoroughly shaken until no more solid KCl dissolves. Some solid KCl is still visible in the flask. The solution in the flask is
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saturated and is at equilibrium with the solid KCl
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An unsaturated aqueous solution of NH3 is at 90°C in 100 grams of water. According to Reference Table G, how many grams of NH3 could this unsaturated solution contain?
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5g
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Which compound is least soluble in water at 60.°C?
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KCl03