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1 Name Date Period Ms. Roman Page 1 Regents Chemistry 1. Which mixture can be separated by using the equipment shown below? 6. Which ion, when combined with chloride ions, Cl, forms an insoluble substance in water? (1) Fe 2+ (2) Mg 2+ (3) Pb 2+ (4) Zn According to Reference Table F, which of these compounds is most soluble at 298 K and 1 atm? (1) AgNO3 (2) AgCl (3) PbCrO4 (4) PbCO3 8. According to Reference Table F, which substance is most soluble? (1) AgI (2) CaSO4 (3) PbCl2 (4) (NH4)2CO3 9. Based on Reference Table F, which salt is least soluble? (1) NaCl(aq) and SiO2(s) (2) NaCl(aq) and C6H12O6(aq) (3) CO2(aq) and NaCl(aq) (4) CO2(aq) and C6H12O6(aq) 2. A student observed the following reaction: AlCl3(aq) + 3 NaOH(aq) Al(OH)3(s) + 3 NaCl(aq) After the products were filtered, which substance remained on the filter paper? (1) NaCl (2) NaOH (3) AlCl3 (4) Al(OH)3 3. In an aqueous of sodium fluoride, the solvent is (1) F (2) Na (3) NaF (4) H2O 4. Which compound is insoluble in water? (1) calcium bromide (2) potassium bromide (1) BaCO3 (2) BaCl2 (3) silver bromide (4) sodium bromide 5. Which barium salt is insoluble in water? (3) Ba(ClO4)2 (4) Ba(NO3)2 (1) FeCO3 (2) Na2CO3 (1) linear (2) symmetrical (3) BaCl2 (4) CaCl2 10. The attraction between water molecules and an Na + ion or a Cl ion occurs because water molecules are (1) KClO3 (2) KNO3 (3) polar (4) nonpolar 11. Which compound is least soluble in water at 60. C? (1) barium phosphate (2) calcium sulfate (3) silver iodide (4) sodium perchlorate (3) NaCl (4) NH4Cl 12. According to Table F which compound is soluble in water? 13. According to your Reference Tables, which substance forms an unsaturated when 80 grams of the substance is dissolved in 100 grams of H2O at 10 C? (1) KI (2) KNO3 (3) NaNO3 (4) NaCl 14. The solubility of KClO3(s) in water increases as the (1) temperature of the increases (2) temperature of the decreases (3) pressure on the increases (4) pressure on the decreases

2 Ms. Roman Page 2 Regents Chemistry 15. According to your Reference Tables, which of these compounds is the least soluble in water? (1) K2CO3 (2) KC2H3O2 (3) Ca3(PO4)2 (4) Ca(NO3)2 16. Solubility data for four different salts in water at 60 C are shown in the table below. 21. A student obtained the following data in determining the solubility of a substance. Which graph best represents the solubility curve drawn from the results obtained by the student? (1) Which salt is most soluble at 60 C? (1) A (2) B (3) C (4) D 17. According to Reference Table G, which of these substances is most soluble at 60ºC? (1) NaCl (2) KCl (3) KClO3 (4) NH4Cl 18. According to Reference Table G, how many grams of KNO3 would be needed to saturate 200 grams of water at 70ºC? (1) 43 g (2) 86 g (3) 134 g (4) 268 g 19. Based on Reference Table G, what is the maximum number of grams of KCl(s) that will dissolve in 200 grams of water at 50 C to produce a saturated? (1) 38 g (2) 42 g (3) 58 g (4) 84 g 20. Based on Reference Table G, what change will cause the solubility of KNO3(s) to increase? (1) decreasing the pressure (2) increasing the pressure (3) decreasing the temperature (4) increasing the temperature (2) (3) (4) 22. Which compound decreases in solubility as the temperature of the is increased from 10ºC to 50ºC? (1) NH4Cl (2) NaCl (3) NH3 (4) NaNO3

3 Ms. Roman Page 3 Regents Chemistry 23. As the temperature increases from 0ºC to 25ºC the amount of NH3 that can be dissolved in 100 grams of water (1) decreases by 10 grams (2) decreases by 40 grams (3) increases by 10 grams (4) increases by 40 grams 24. The graph below represents four solubility curves. Which curve best represents the solubility of a gas in water? (1) A (2) B (3) C (4) D 25. Under which conditions of temperature and pressure is a gas most soluble in water? (1) high temperature and low pressure (2) high temperature and high pressure (3) low temperature and low pressure (4) low temperature and high pressure 26. At room temperature, the solubility of which solute in water would be most affected by a change in pressure? (1) methanol (2) sugar (3) carbon dioxide (4) sodium nitrate 27. Given the diagram below that shows carbon dioxide in an equilibrium system at a temperature of 298 K and a pressure of 1 atm: Which changes must increase the solubility of the carbon dioxide? (1) increase pressure and decrease temperature (2) increase pressure and increase temperature (3) decrease pressure and decrease temperature (4) decrease pressure and increase temperature 28. What is the total number of grams of NaI(s) needed to make 1.0 liter of a M? (1) (2) 0.15 (3) 1.5 (4) Which is the most concentrated? (1) 1 mole of solute dissolved in 1 liter of (2) 2 moles of solute dissolved in 3 liters of (3) 6 moles of solute dissolved in 4 liters of (4) 4 moles of solute dissolved in 8 liters of 30. What is the molarity of a containing 20 grams of NaOH in 250 milliliters of? (1) 1 M (2) 2 M (1) 1.00 g (2) 2.00 g (3) 0.04 M (4) 0.5 M 31. How many grams of KOH are needed to prepare 250 milliliters of a 2.0 M of KOH? (3) 28 g (4) 112 g 32. The molarity of an aqueous of NaCl is defined as the (1) grams of NaCl per liter of water (2) grams of NaCl per liter of (3) moles of NaCl per liter of water (4) moles of NaCl per liter of

4 Ms. Roman Page 4 Regents Chemistry 33. What is the molarity of 1.5 liters of an aqueous that contains 52 grams of lithium fluoride, LiF, (gram-formula mass = 26 grams/mole)? (1) 1.3 M (2) 2.0 M (1) 0.50 mol (2) 2.0 mol (3) 3.0 M (4) 0.75 M 34. How many total moles of KNO3 must be dissolved in water to make 1.5 liters of a 2.0 M? (1) 1 M (2) 2 M (3) 3.0 mol (4) 1.3 mol 35. What is the molarity of a containing 20 grams of NaOH in 500 milliliters of? (3) 0.04 M (4) 0.5 M 36. What is the molarity of a of NaOH if 2 liters of the contains 4 moles of NaOH? (1) 0.5 M (2) 2 M (3) 8 M (4) 80 M 37. Which preparation produces a 2.0 M of C6H12 O6? [molecular mass = 180.0] (1) 90.0 g of C6H12O6 dissolved in ml of (2) 90.0 g of C6H12O6 dissolved in ml of (3) g of C6H12O6 dissolved in ml of (4) g of C6H12O6 dissolved in ml of 38. What is the molarity of a that contains 40. grams of NaOH in 0.50 liter of? (1) 1.0 M (2) 2.0 M (1) 1 M (2) 2 M (3) 0.50 M (4) 0.25 M 39. What is the concentration of a which contains 1 mole of CaCl2 dissolved in 2,000 milliliters of? (1) g (2) 0.05g (3) 0.5 M (4) 0.25 M 40. What is the total mass of solute in grams of a having a concentration of 5 parts per million? (3) 0.5 g (4) 5g 41. If gram of Pb(NO3)2 is dissolved in 100. grams of H2O, what is the concentration of the resulting, in parts per million? (1) ppm (2) 2.5 ppm (1) 20 ppm (2) 2 ppm (3) 250 ppm (4) ppm 42. What is the concentration of a, in parts per million, if 0.02 gram of Na3PO4 is dissolved in 1000 grams of water? (1) g (2) g (3) 0.2 ppm (4) 0.02 ppm 43. How many grams of NaCl are needed to be dissolved in water to make 1.0 gram of a ppm? (1) g (2) g (3) g (4) g 44. How many grams of KNO3 should be dissolved in water to make grams of a 20.0 ppm? (1) ppm (2) ppm (3) g (4) g 45. What is the concentration expressed in parts per million of a containing 15.0 grams of KNO3 in 65.0 grams of H2O? (3) ppm (4) ppm 46. Compared to the freezing point and boiling point of water at 1 atmosphere, a of a salt and water at 1 atmosphere has a (1) lower freezing point and a lower boiling point (2) lower freezing point and a higher boiling point (3) higher freezing point and a lower boiling point (4) higher freezing point and a higher boiling point 47. Which concentration of a of CH3OH in water has the lowest freezing point? (1) 0.1 M (2) 0.01 M (3) M (4) M

5 Ms. Roman Page 5 Regents Chemistry 48. What occurs as a salt dissolves in pure water? (1) The number of ions in the decreases, and the freezing point decreases. (2) The number of ions in the decreases, and the freezing point increases. (3) The number of ions in the increases, and the freezing point decreases. (4) The number of ions in the increases, and the freezing point increases. 49. Which has the lowest freezing point? (1) 10. g of KI dissolved in 100. g of water (2) 20. g of KI dissolved in 200. g of water (3) 30. g of KI dissolved in 100. g of water (4) 40. g of KI dissolved in 200. g of water 50. A 1 kilogram sample of water will have the highest freezing point when it contains (1) dissolved particles (2) dissolved particles (3) dissolved particles (4) dissolved particles

6 Answer Key Solutions Unit Exam Ms. Roman Page 6 Regents Chemistry

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