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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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