Chemistry Final: Solutions Test – Flashcards
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How does solubility generally vary as the temperature increases?
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Solubility increases
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What is the maximum amount of KCl that can dissolve in 200g of water? (Solubility of KCl is 34g/100g H2O at 20degrees C).
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68
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What happens to the solubility of a gas, in a liquid, if the partial pressure of the gas above the liquid decreases?
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The solubility decreases
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If the solubility of a gas in water is 4 g/L when the pressure of the gas above the water is 3 atm, what is the pressure of the gas above the water when the solubility of the gas is 1 g/L
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.75 atm
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Which of the following factors both affect the solubility of a particular substance?
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Temperature and the nature of solute and solvent
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If a crystal is added to an aqueous solution causes many particles to come out of the solution; the original solution was
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Supersaturated
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The solubility of a gas in a liquid is
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Directly proportional to the pressure of the gas above the liquid
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What is the molarity of a solution containing 9 moles of solute in 500 mL of solution
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18 M
9/.5
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What is the number of moles of solute in 250 mL of a .4M solution?
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.1 mol
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What mass of Na2SO4 is needed to make 2.5L of 2.0 M solution?
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710 g
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A dilute solution is one in which there is a
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Small amount of solute in a large amount of solvent
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What does not change when a solution is diluted by the addition of solvent?
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Numbers of moles of solute
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Colligative properties depend up
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The number of particles dissolved in a given mass of solvent
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Which of the following solutes is most effective in lowering the vapor pressure of water?
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AlCl3
(Most elements)
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Why does a solute depress the freezing point?
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Because the solute disrupts crystal formation by the solvent.
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Which of the following is NOT a colligative property of a solution?
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Supersaturation
