M&E_Unit_09_Exam_SC.pdf

Matter and Energy Name:______________________ Unit 09 Exam 1. A student prepares four aqueous solutions, each with a different solute. The...

Matter and Energy Name:______________________ Unit 09 Exam 1. A student prepares four aqueous solutions, each with a different solute. The mass of each dissolved solute is shown in the table below. Which solution is saturated? A) 1 B) 2 C) 3 D) 4 2. A solution contains 70 grams of NaNO3 in 100 grams of water at 10°C. How many additional grams of NaNO 3 are required to saturate this solution? A) 10 B) 20 C) 60 D) 70 3. A solution containing 55 grams of NH4Cl in 100. grams of water is saturated at a temperature of A) 57°C B) 47°C C) 67°C D) 77°C 4. A solution contains 35 grams of KNO3 dissolved in 100 grams of water at 40°C. How much more KNO3 would have to be added to make it a saturated solution? A) 29 g B) 24 g C) 12 g D) 4g 5. A solution containing 90. grams of KNO3 per 100. grams of H2O at 50.°C is considered to be A) dilute and unsaturated B) dilute and supersaturated C) concentrated and unsaturated D) concentrated and supersaturated 6. A solution contains 100 grams of a nitrate salt dissolved in 100 grams of water at 50ºC. The solution could be a A) supersaturated solution of NaNO 3 B) saturated solution of NaNO 3 C) supersaturated solution of KNO3 D) saturated solution of KNO 3 7. Which saturated solution would be the most dilute at 0°C? A) KI B) NaCI C) NaNO3 D) KClO 3 8. Base your answer to the following question on the diagram below which represents the solubility curve of salt X. The four points on the diagram represent four solutions of salt X. Which point represents a supersaturated solution of salt X? A) A B) B C) C D) D 9. How many grams of NaNO3 would have to be added to 100. grams of water at 45ºC to make a saturated solution of this salt? A) 100. B) 110. C) 120. D) 130. 10. A solution contains 90 grams of a salt dissolved in 100 grams of water at 40ºC. The solution could be an unsaturated solution of A) KCl B) KNO3 C) NaCl D) NaNO3 11. What is the molarity of a NaOH solution containing 0.125 mole of NaOH in 0.200 L of water? A) 0.025 M B) 0.250 M C) 0.625 M D) 1.60 M 12. How many milliliters of 1 M HCl(aq) must be diluted with water to make exactly 500 mL of 0.1 M HCl(aq)? A) 10 mL B) 50 mL C) 100 mL D) 5000 mL 13. A 3.0 M HCl(aq) solution contains a total of A) 3.0 grams of HCl per liter of water B) 3.0 grams of HCl per mole of solution C) 3.0 moles of HCl per liter of solution D) 3.0 moles of HCl per mole of water 14. If 0.50 liters of a 2.0M HCl is diluted with H 2O to a volume of 1.0 liters, the molarity of the new solution will be A) 1.0 M B) 2.0 M C).25 M D).50 M 15. What is the total number of moles of H 2SO 4 needed to prepare 5.0 liters of a 2.0 M solution of H2SO 4? A) 2.5 B) 5.0 C) 10. D) 20. 16. What is the molarity of a solution that contains 20. grams of CaBr2 in 0.50 liter of solution? A) 0.50 M B) 0.20 M C) 5.0 M D) 10. M 17. What is the molarity of a solution that contains 0.25 mole of solute in 250 milliliters of solution? A) 1.0 M B) 0.025 M C) 0.50 M D) 0.75 M 18. When a teaspoonful of sugar is added to water in a beaker, the sugar dissolves. What is the resulting mixture called? A) a compound B) an alloy C) a solution D) a heterogeneous mixture 19. The solubility of most solids in water can be increased by A) increasing the amount of solvent B) increasing the temperature of the solvent C) stirring rapidly while dissolving the solid D) grinding the solid to a fine powder before dissolving 20. Which statement describes a solution of sodium chloride in water? A) The mixture is heterogeneous, the solute is NaCl and the solvent is H 2O. B) The mixture is heterogeneous, the solute is H 2O and the solvent is NaCl. C) The mixture is homogeneous, the solute is NaCl and the solvent is H 2O. D) The mixture is homogeneous, the solute is H 2O and the solvent is NaCl.