50. Which one of the following statements is false? 45. The reaction zn (s) 2 HC

Question

50. Which one of the following statements is false? 45. The reaction zn (s) 2 HCI(aq) zncl2(aq) Hz(g) is (a) Solutions are always liquids. (a) a decomposition reaction (b) Solutions contain solute and solvent. b) a combination reaction (c) Solutions are not pure substances. c) a single-displacement reaction (d) The solute is dissolved in the solvent. a single-displacement reaction and a (e) Molarity is a unit of solution concentration. precipitation reaction. a double-displacement reaction and a 51. What is the simplified shape of the 1s orbital? precipitation reaction (a) A sphere 46. Which of the following would weigh most? b) A circle. (a) 1.00 mole pb (c) A peanut or figure-8 shape. (b) 4.50x1026 O2 molecules (d) A cloverleaf shape. (c) 14.0 kg of CO2 e) A cube d) 1 atom of Au (e) To three significant figures, they all weigh the 52. Which of the following statements is false? same (a) Electrolyte solutions contain ions. 47. What is the mass of 1.00x1030 sodium atoms? (b) An electrolyte solution is formed by dissolved Naci in water. (a) 1.38x10 s g c) Electrolyte solutions conduct electricity. b) 23.0 g (d) HCl(aq) is an electrolyte solution c) 3.82x107 g (e) Any substance that dissolves in water forms an d) 1.66x106 g electrolyte solution e) 1,00x1030 g 53. What is the concentration of a solution made b 48. Which one of the following statements about ionic dissolving 30.00 g of glucose in enough water to make compounds is true? 500 g of solution? (a) They are held together by covalent bonds. (a) 5.96 mass% (b) The formula unit represents the simplest integer (b) 6.00 mass% ratio of the component elements. (c) 6.38 mass% (c) They may have an overall charge. (d) 59.6 mass% d) They can be made of cations only. (e) 600 mass% (e) They are discrete molecules and may be solids 54. 10.0 mL of a 6.00 M glucose solution is diluted until the liquids or gases at room temperature. total volume of the solution is 250 mL. What is the 49. What mass of HMno4 can be made in the reaction of concentration of the final solution? o 125 moles of Mnso4, 0.345 moles of Pbo2 and 0.225 a) 0.24 M moles of H2soa given the balanced chemical equation b) 2.4 M 2 MnSO4 5 Pbo2 3 H2SO4 2 HMno4 5 Pbso4 2 c) 4.2 M H20? d) 150 M (a) 0.125 g (e) 15,000 M b) 15.0 g c) 16.5 g d) 18.0 g (e) 120 g Page 6 of 8

Explanation / Answer

45. d

46. c

47. b

48. e

49. b

50. c

51. a

52. d

53. b

54. a

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