General, Organic, and Biological Chemistry Smith Exam 4 (Ch 8-10) Dominican University Latest Update 2023

Which of the following is a heterogeneous mixture? a) Oxygen b) Ammonium sulfide c) Soda pop (e.g. Coke or Slice) d) A bowel of milk and cereal - ANS-d) A bowel of milk and cereal Which of the following salts would be insoluble in water? a) Ammonium chloride b) Silver nitrate c) Lead (I) bromide d) Sodium sulfate - ANS-c) Lead (I) bromide Which of the following changes would DECREASE the solubility of oxygen gas in water? a) Decreasing the temperature of the solution b) Increasing the temperature of the solution c) Increasing the partial pressure of oxygen gas d) Adding a catalyst - ANS-b) Increasing the temperature of the solution Which of the following would INCREASE the solubility of a silver chloride solid in water? a) Increasing the atmospheric pressure b) Decreasing the atmospheric pressure c) Increasing the temperature d) Decreasing the temperature - ANS-c) Increasing the temperature The solubility of magnesium carbonate in water at 25°C is 200. mg in 100 ml of water. Which of the following procedures would produce an UNSATURATED solution? a) Adding 240 mg of magnesium carbonate to 100 ml of water at 25°C b) Completely dissolving 200 mg of magnesium carbonate in 100 ml of water at 100°C, then slowly cooling the solution to 25°C. as to not cause precipitation c) Adding 120 mg of magnesium carbonate to 100 ml of water at 25°C d) Completely dissolving 220 mg of magnesium carbonate in 100 ml of water at 100°C, then slowly cooling the solution to 25°C as to not cause precipitation - ANS-c) Adding 120 mg of magnesium carbonate to 100 ml of water at 25°C What is the molarity of a solution if 2.10 moles of glucose (C₆H₁₂O₆) is dissolved in 3.0 liters of solution? a) 380 M b) 130 M c) 0.70 M d) 2.1 M - ANS-c) 0.70 M How many milliliters of a 1.2 M sodium chloride solution contains .055 moles of sodium chloride? a) 46 ml b) 66 ml c) 0.046 ml d) 0.066 ml - ANS-a) 46 ml How many grams of potassium sulfate (K₂SO₄) are dissolved in a 2.4 L solution of 0.32 M potassium sulfate? a) 1,300 g b) 230 g c) 130 g d) 23.2 g - ANS-c) 130 g How many milliliters of a 0.74 M sodium hydroxide (NaOH) solution contain 22 grams of sodium hydroxide (NaOH)? a) 0.41 ml b) 740 ml c) 2.5 ml d) 0.74 ml - ANS-b) 740 ml How many milliliters of a 6.0 M HCl solution would be needed to prepare 450 mL of a 2.5 M HCl solution? a) 1,100 ml b) 30. ml c) 190 ml d) 0.033 ml - ANS-c) 190 ml Given the information in the table below, what is the boiling point of a 7.0 molality glucose (C₆H₁₂O₆) solution in water? Water: Normal boiling point: 100.0°C Kb: 0.52°C/m Continues...