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Unit C Quiz #1 Solutions Quiz

Part 1: True/False Indicate whether the statement is true (a) or false (b). Record vour answer on your answer sheet under Part 1: True/Fase 1. (A/B) Solutions are heterogeneous mixtures composed of at least one solute and one solvent. 2. (A/B) Compounds are electrolytes if their aqueous solutions conduct electricity. 3. (A/B) A chemical reaction that releases energy is classified as endothermic. 4. (A/B) In general, a percentage by volume concentration may be defined as 5. (A/B) Amount concentration has units of mol/L. 6. (A/B) A sample of well water contains 0.33 pm of iron (IlI) nitrate. Testing shows that the mass of iron (IlI) nitrate in 0.50 L of water is 0.15 mg. 7. (A/B) The amount concentration produced when 3.75 g of sodium carbonate is placed into 0.200 L of solution is 0.127 mol/L. Part 2: Multiple Choice Identify the choice that best completes the statement or answers the question. Record your answer on your answer sheet under Part 2: Multiple Choice 1. Which of the following is not a solution? a. oxygen in water b. tin in copper (bronze) c. sand in water d. sugar in water 2. Which of the following does not dissolve very well in water? a. sodium chloride b. sugar c. ethanol d. gasoline

3. Oxygen and carbon dioxide are only slightly soluble in water because a. they are gases, not liquids b. they are made up of nonpolar molecules c. they are made up of small molecules d. water is nonpolar 4. The separation of ions that occurs as ionic compounds dissolve in water is known as a. dissociation b. melting c. ionization d. Dissolving 5. Water is referred to as the "universal solvent" because a. water molecules are small in size b. water molecules are highly polar c. water molecules form hydrogen bonds d. all of the above 6. What mass of pure hydrogen peroxide is dissolved in 250 mL of 6.0% W/V H 2 O 2 (aq)? a. 12 g b. 25 g c. 6 g d. 15 g 7. When diluting concentrated acids, always add a. a small acid volume to a larger volume of water b. a tiny volume of water to the acid c. a large acid volume to a small amount of water d. a 50-50 mixture of acid and water 8. What volume of water should be added to 500 mL of a 1.0 mol/L CuSO 4 (ag) solution to dilute it to 0.5 mol/L? a. 500 mL b. 1.0 L c. 250 mL D. 125mL 9. A bottle contains 3 L of 12 mol/L H 2 SO 4 (aq) solution. After half of the acid has been used up, the remaining solution has an amount concentration of a. 18 mol/L b. 12 mol/L c. 6 mol/L d. 3 mol/L

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10. Which of the following contains 1 mol of dissolved copper(II) nitrate? a. 500 mL of a 0.5 mol/L solution b. 750 mL of a 0.75 mol/L solution c. 500 mL of a 2.0 mol/L solution d. 1 L of a 0.9 mol/L solution 11. When preparing a standard solution from dilution, which of the following lab items is not required? a. pipette b. volumetric flask c. beaker d. burette 12. Which of the following correctly lists the properties of each solution? a. copper(Il) sulfate, nonelectrolyte, ionized b. lead(Il) iodide, electrolyte, ionized c. sucrose, electrolyte, dissociated d. sodium nitrate, electrolyte, dissociated 13. A student listed some of the steps needed to prepare 250 mL of a 0.500 mol/L LiNO 3 (aq) solution. 1. Calculate the required mass of LiNO 3 (s) necessary to prepare the solution. 2. Wash the volumetric flask, beaker, stirring rod, and funnel. 3. Completely dry the volumetric flask. 4. Dissolve the LiNO 3 (s) in approximately half the required volume of distilled water. 5. Transfer the dissolved LiNO 3 (ac) solution into the volumetric flask. 6. Add water to the calibration mark on the flask. 7. Stopper, then invert the volumetric flask a number of times. Which step(s) is/are not necessary? a. 2 and 3 b. 7 only c. 3 only d. 4 and 7 14. For which of the following situations does a decrease in temperature usually cause an increase in solubility? a. a gas dissolving in a gas b. a gas dissolving in a liquid c. a gas dissolving in a solid d. a solid dissolving in a liquid

15. What is the amount concentration of 0.20 mol of potassium hydroxide in 0.75 L of solution? a. 0.37 mol/L b. 3.75 mol/L c. 2.66 mol/L d. 0.27 mol/L 16. Cola soft drinks have a sucrose concentration of 11 g/100 mL. What mass of sucrose is present in a 355 ml A can of cola? a. 11 g b. 39 g c. 30 g d. 22 g 17. The concentration of fluoride ions, F , in municipal drinking water should not exceed 1.5 ⁻ pm. What is the maximum mass of fluoride ions that can be dissolved in 500 mL of water, while not exceeding this limit? a. 0.75 mg b. 1.5 mg c. 750 mg d. 0.003 mg 18. Which piece of lab equipment is used for preparing a precise volume of a solution? a. Erlenmeyer flask b. beaker c. volumetric flask d. graduated cylinder 19. Which of the following solutions, when mixed, would produce a PbI 2 (s) precipitate? a. PbCl 2 , and AgI b. Pb(NO 3 )2 and AgI c. Pb(C 2 H 3 O 2 ) 2 and NaI d. PbCl 2 and NaI 20. Which of the following anions in solution would precipitate the silver ion, Ag ? ⁺ a. SO 4 ² ⁻ b. S² ⁻ c. Cl ⁻ d. all of the above

21. Which of the following chemical equations is a correct dissociation equation? a. C 2 H 5 OH(l) -> C 2 H 5 OH(aq) b. LiOH(s) -> Li (aq) + O² (aq) + H (aq) ⁺ ⁻ ⁺ c. C 2 H 5 OH(l) -> C 2 H 5 O + H (aq) ⁻ ⁺ d. NaCI(s) -> Na (aq) + CI (aq) ⁺ ⁻ 22. A laboratory technician is asked to create 250.0 mL of a 0.500 mol/L solution of CuSO 4 5H ★ 2 0(s). What mass of the solute is required? a. 62.4 g b. 31.2 g c. 80.0 g d. 20.0 g Part 3: Numerical Response Record your answer and round to correct significant digits on your answer sheet under Part 3: Numerical Response 1. A solution of copper (II) sulfate is used at blood donor clinics to test donor blood for low iron. Calculate the concentration of this solution, in mol/L, if 125 g of CuSO 4 crystals is dissolved in 1.0 L of water. 2. DSW is an intravenous solution used as a fluid and nutrient replenisher for patients. As a hospital pharmacist. you need to make 750 mL of this solution with a concentration of 0.30 mol/L. What mass (in grams) of glucose (dextrose), C 6 H 12 O 6 , will you need to dissolve in water?

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3. Saline solutions are used in hospitals to replace lost body fluids and electrolytes. A normal saline solution is made by dissolving 0.9 g of NaCI in 100 mL of water. Calculate its concentration as percent by mass. 4. What volume (in mL) of a 17.4 mol/L acetic acid stock solution is required to make 2.0 L of a 1.5 mol/L acetic acid solution?

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