Chemistry Unit 7: Molarity and Acids-Bases Relations Quiz
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Questions and Answers

What is the main reason why NaCl ionizes in solution?

  • To turn the solution blue
  • To become insoluble
  • To produce gas
  • To carry charge to the electrodes (correct)

Which of the following compounds is most soluble in hexane?

  • Compound D (correct)
  • Compound B
  • Compound C
  • Compound A

In the potassium chloride solutions provided, which solution has the highest molarity?

  • Solution D
  • Solution C
  • Solution B
  • Solution A (correct)

Which flask has the higher molarity when comparing Flask 1 and Flask 2?

<p>Flask 2, because it has more moles of solute per liter of solvent than Flask 1. (D)</p> Signup and view all the answers

What happens to solid copper (II) chloride when added to water based on the observation provided?

<p>(aq) CuCl2 + 2 Cl- (C)</p> Signup and view all the answers

Which of the following best describes a weak base?

<p>A dilute strong base (B)</p> Signup and view all the answers

How does crushing a sugar cube before adding it to a cup of coffee affect solubility?

<p>Crushing the sugar cube increases the surface area, therefore solubility is increased. (D)</p> Signup and view all the answers

If a small amount of solute remains undissolved in water, what kind of solution is this?

<p>Unsaturated (C)</p> Signup and view all the answers

Which type of students in the study might experience better relief from capsaicin, those who drink milk or those who drink water?

<p>Those who drink milk because it dissolves capsaicin better due to its nonpolar nature. (C)</p> Signup and view all the answers

What happens to the solubility of a substance when added to water if its molarity is doubled?

<p>Solubility remains the same (D)</p> Signup and view all the answers

What is required to make a supersaturated solution?

<p>Adding more solute than what can normally be dissolved at that temperature (B)</p> Signup and view all the answers

If 2 moles of KNO3 are dissolved in water to make 1 L of a solution, what is the molarity of the solution?

<p>$2 M$ (A)</p> Signup and view all the answers

What would be the correct molarity of a solution prepared by dissolving 8.6g of KCl (molar mass = 74.5g/mol) in 500mL of solution?

<p>0.095 M (A)</p> Signup and view all the answers

Which ions are associated with bases, similar to the association of _____ ions with acids?

<p>Hydroxide, Hydronium (A)</p> Signup and view all the answers

How would a solution with a pH of 4.7 be classified?

<p>Acid (D)</p> Signup and view all the answers

If the pressure of a gas is halved from 4.00 atm to 2.00 atm at constant temperature, what happens to the volume?

<p>Doubles (B)</p> Signup and view all the answers

If a gas occupies 300mL at 2.00 atm pressure and the pressure decreases to 1.00 atm while keeping the temperature constant, what would be the new volume measurement?

<p>600 mL (C)</p> Signup and view all the answers

Why does a solution of hydrochloric acid conduct electricity, while a solution of distilled water does not?

<p>Because hydrochloric acid contains mobile ions that can carry charge. (A)</p> Signup and view all the answers

What effect does drinking milk have on the heat felt by the students after eating pepper?

<p>It decreases the heat felt (A)</p> Signup and view all the answers

Based on the data, which solvent appears to be the least effective at reducing the heat felt from eating pepper?

<p>Nothing (A)</p> Signup and view all the answers

Why do you think capsaicin dissolves better in one solvent over another?

<p>The solute-solvent interactions are stronger in one solvent (A)</p> Signup and view all the answers

In the Lewis structure of ethanol, what types of interactions can form between ethanol molecules?

<p>Hydrogen bonds (C)</p> Signup and view all the answers

Based on solubility principles, is ethanol soluble in water?

<p>Yes, because of hydrogen bonding (D)</p> Signup and view all the answers

What is the total pressure, in atm, in the tank at 327°C when 6.30 mol of CO(g), 4.50 mol of H2(g), and 2.25 mol of CH3OH are present?

<p>1.32 atm (D)</p> Signup and view all the answers

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