CHE 105 Summer 2016 EX2
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1 CHE 105 Summer 2016 EX2 Your Name: Your ID: Question #: 1 How many grams of H2SO4 (molar mass = g/mol) are in 0.23 moles of H2SO4? Do not include units in your answer. 1 grams 1. Question #: 2 When 2.8 grams of HCl(aq) reacts with an excess of MnO2(s) according to the balanced chemical equation below, how many grams of H2O(l) are produced? 4 HCl(aq) + MnO2(s) MnCl2(aq) + 2 H2O(l) + Cl2(g) A g B. 1.4 g C g D. 2.3 g Question #: 3 A maximum of 1 grams of Cl2 can be produced from the reaction of 12.0 grams of HCl with 15.0 grams of O2. 4 HCl(aq) + O2(g) 2 H2O(g) + 2 Cl2(g) Report your answer with three significant digits, in the form 2.22E2 or 2.22E-2 if you use scientific notation. Do NOT include units in your answer. 1.
2 Question #: 4 When 7.9 grams of Al (26.98 g/mol) are reacted with excess Cl2 (70.90 g/mol), 28 grams of AlCl3 (133.3 g/mol) are produced according to the balanced chemical equation: 2 Al(s) + 3 Cl2(g) 2 AlCl3(s) The yield of aluminum chloride is 1 %. Report your answer with two significant figures. Do NOT use scientific notation. Do NOT include units in your answer. 1. Question #: 5 What is the molarity of a solution formed by dissolving 15.1 g of Ca(NO3)2 (molar mass g/mol) in enough water to yield ml of solution? A M B M C x 10-3 M D M Question #: 6 Select the true statement below about solutions A, B, and C. Each red dots represents an identical amount of solute and the light blue represents solvent. A. Solution C has a lower concentration than solution A. B. Solution B is more dilute than solution C. C. Solutions A and B have the same concentration. D. Solution A is the least concentrated.
3 Question #: 7 Which of the following is a nonelectrolyte when dissolved in water? A. CH3COOH (acetic acid) B. KCl (potassium chloride) C. NaOH (sodium hydroxide) D. C12H22O11 (sucrose) Question #: 8 What is the solid product when aqueous solutions of AgNO3 and KCl are combined? A. KNO3 B. K2NO3 C. NO3Cl D. AgCl Question #: 9 What is the net ionic equation for the reaction that occurs when aqueous solutions of CaI2 and K2SO4 are mixed? A. K + (aq) + I (aq) KI(s) B. Ca 2+ (aq) + SO4 2 (aq) CaSO4(s) C. 2K + (aq) + SO4 2 (aq) + Ca 2+ (aq) + 2I - (aq) CaSO4(s) + KI(s) D. K + (aq) + I (aq) KI(aq)
4 Question #: 10 A 15 ml sample Ca(OH)2(aq) is titrated with 33 ml of a 0.24 M hydrobromic acid (HBr) solution to reach the equivalence point. The concentration of the Ca(OH)2 solution is 1 M. Report your answer with two significant digits, in the form 2.2E2 or 2.2E-2 if you use scientific notation. Do NOT include units in your answer. 1. Question #: 11 The oxidation number of manganese in KMnO4 is Question #: 12 Select the two true statements about the following redox reaction. Mg(s) + Br2(l) MgBr2(s) A. Mg is oxidized. B. Mg is reduced. C. Mg is the oxidizing agent. D. Mg is the reducing agent. Question #: 13 A sample of He(g) occupies 22 L at 124 ºC at a certain pressure. The volume of He(g) is 1 L at 65 ºC and the same pressure. Report your answer with two significant digits. Do NOT include units in your answer. 1.
5 Question #: 14 At the same temperature and pressure, balloons A and B contain the same mass of gas. One of them contains helium and the other contains xenon. Balloon 1 [A or B] contains helium. 1. Question #: 15 Select the statement that is consistent with the ideal gas law. A. The pressure of the gas is inversely proportional to the volume of the gas. B. The pressure of the gas is inversely proportional to the number of moles of gas. C. The ideal gas constant is dependent on the identity of the gas. D. The pressure of the gas is inversely proportional to the absolute temperature of the gas. Question #: 16 A 2.45 L container is filled with nitrogen at 37 ºC to a pressure of 2.15 atm. How many moles of nitrogen are in this container? A mol B mol C mol D mol
6 Question #: 17 What is the density of H2O(g) at 20.0 C and 2.40 atm? A g/l B g/l C g/l D g/l Question #: 18 The partial pressure of a gas in a mixture is A. the total pressure of the mixture multiplied by the mole fraction of the gas. B. always highest for a noble gas. C. moles of the gas divided by the total pressure of the mixture. D. the same for all components of the mixture, regardless of mole fraction. Question #: 19 What volume of carbon monoxide is produced at 25 C and 1.82 atm when 5.2 grams of carbon is consumed in the following reaction? C(s) + H2O(g) CO(g) + H2(g) A. 5.8 L B. 2.4 L C. 5.0 L D. 4.4 L
7 Question #: 20 Which of the following statements is a postulate of kinetic molecular theory? A. The size of a gas particle is negligibly small. B. The average kinetic energy of a gas particle is inversely proportional to the temperature in Kelvin. C. Gas particles do not collide with each other. D. All gas molecules are attracted to each other. Question #: 21 Which statement is true regarding the rate of effusion of N2(g) and Ne(g) from a container? A. N2 will effuse at the same rate as Ne. B. N2 will effuse faster than Ne. C. N2 will effuse slower than Ne. D. N2 will not effuse from the container but Ne will effuse. Question #: 22 Select two conditions that cause a real gas to act less than ideal. A. high pressure B. high temperature C. low temperature D. low pressure
8 Question #: 23 Which of the following statements about the nature of energy is false? A. Thermal energy is a specific type of kinetic energy associated with molecular motion. B. Energy is absorbed by a system during an endothermic reaction. C. Energy can be created or destroyed in a chemical reaction. D. Energy is the capacity to do work. Question #: 24 If a system does 430 kj of work and absorbs 250 kj of heat, what is the change in internal energy (ΔE) of the system? A. 180 kj B. 180 kj C. 680 kj D. 680 kj Question #: 25 A tanker truck carrying 1.30 x 10 2 kg of 18.4 M sulfuric acid tips over and spills its load. If the density of H2SO4 is 1.84 kg/l, how many kilograms of sodium hydroxide (NaOH, molar mass = 40.0 g/mol) are needed to neutralize the acid? 1 kilograms Give your answer using the correct number of significant figures and use the format 2.22E2 or 2.22E-2 for scientific notation. 1.
9 DRAFT Do Not Use Until Posted. CHE 105 Summer 2016 EX2V2 - Confidential Your Name: Your ID: attachment_for_pubexamuid_lnxp xx_84.jpg Question #: 1 How many grams of H 2 SO 4 (molar mass = g/mol) are in 0.23 moles of H 2 SO 4? Do not include units in your answer. 1 grams Question #: 2 When 2.8 grams of HCl(aq) reacts with an excess of MnO 2 (s) according to the balanced chemical equation below, how many grams of H 2 O(l) are produced? 4 HCl(aq) + MnO 2 (s) MnCl 2 (aq) + 2 H 2 O(l) + Cl 2 (g)
10 A g B. 1.4 g C g D. 2.3 g Question #: 3 A maximum of 1 grams of Cl 2 can be produced from the reaction of 12.0 grams of HCl with 15.0 grams of O 2. 4 HCl(aq) + O 2 (g) 2 H 2 O(g) + 2 Cl 2 (g) Report your answer with three significant digits, in the form 2.22E2 or 2.22E-2 if you use scientific notation. Do NOT include units in your answer E E1 Question #: 4 When 7.9 grams of Al (26.98 g/mol) are reacted with excess Cl 2 (70.90 g/mol), 28 grams of AlCl 3 (133.3 g/mol) are produced according to the balanced chemical equation: 2 Al(s) + 3 Cl 2 (g) 2 AlCl 3 (s) The yield of aluminum chloride is 1 %. Report your answer with two significant figures. Do NOT use scientific notation. Do NOT include units in your answer Question #: 5 What is the molarity of a solution formed by dissolving 15.1 g of Ca(NO 3 ) 2 (molar mass g/mol) in enough water to yield ml of solution? A M
11 B M C x 10-3 M D M Question #: 6 Select the true statement below about solutions A, B, and C. Each red dots represents an identical amount of solute and the light blue represents solvent. A. Solution C has a lower concentration than solution A. B. Solution B is more dilute than solution C. C. Solutions A and B have the same concentration. D. Solution A is the least concentrated. Question #: 7 Which of the following is a nonelectrolyte when dissolved in water? A. CH 3 COOH (acetic acid) B. KCl (potassium chloride) C. NaOH (sodium hydroxide) D. C 12 H 22 O 11 (sucrose) Question #: 8 What is the solid product when aqueous solutions of AgNO 3 and KCl are combined? A. KNO 3
12 B. K 2 NO 3 C. NO 3 Cl D. AgCl Question #: 9 What is the net ionic equation for the reaction that occurs when aqueous solutions of CaI 2 and K 2 SO 4 are mixed? A. K + (aq) + I (aq) KI(s) B. Ca 2+ (aq) + SO 4 2 (aq) CaSO4 (s) C. 2K + (aq) + SO 4 2 (aq) + Ca 2+ (aq) + 2I - (aq) CaSO4 (s) + KI(s) D. K + (aq) + I (aq) KI(aq) Question #: 10 A 15 ml sample Ca(OH) 2 (aq) is titrated with 33 ml of a 0.24 M hydrobromic acid (HBr) solution to reach the equivalence point. The concentration of the Ca(OH) 2 solution is 1 M. Report your answer with two significant digits, in the form 2.2E2 or 2.2E-2 if you use scientific notation. Do NOT include units in your answer E-1 Question #: 11 The oxidation number of manganese in KMnO 4 is seven plus seven seven 7 Question #: 12 Select the two true statements about the following redox reaction. Mg(s) + Br 2 (l) MgBr 2 (s) A. Mg is oxidized.
13 B. Mg is reduced. C. Mg is the oxidizing agent. D. Mg is the reducing agent. Question #: 13 A sample of He(g) occupies 22 L at 124 ºC at a certain pressure. The volume of He(g) is 1 L at 65 ºC and the same pressure. Report your answer with two significant digits. Do NOT include units in your answer E1 Question #: 14 At the same temperature and pressure, balloons A and B contain the same mass of gas. One of them contains helium and the other contains xenon. Balloon 1 [A or B] contains helium. 1. B Question #: 15 Select the statement that is consistent with the ideal gas law. A. The pressure of the gas is inversely proportional to the volume of the gas. B. The pressure of the gas is inversely proportional to the number of moles of gas. C. The ideal gas constant is dependent on the identity of the gas. D. The pressure of the gas is inversely proportional to the absolute temperature of the gas.
14 Question #: 16 A 2.45 L container is filled with nitrogen at 37 ºC to a pressure of 2.15 atm. How many moles of nitrogen are in this container? A mol B mol C mol D mol Question #: 17 What is the density of H 2 O(g) at 20.0 C and 2.40 atm? A g/l B g/l C g/l D g/l Question #: 18 The partial pressure of a gas in a mixture is A. the total pressure of the mixture multiplied by the mole fraction of the gas. B. always highest for a noble gas. C. moles of the gas divided by the total pressure of the mixture. D. the same for all components of the mixture, regardless of mole fraction. Question #: 19 What volume of carbon monoxide is produced at 25 C and 1.82 atm when 5.2 grams of carbon is consumed in the following reaction? C(s) + H 2 O(g) CO(g) + H 2 (g)
15 A. 5.8 L B. 2.4 L C. 5.0 L D. 4.4 L Question #: 20 Which of the following statements is a postulate of kinetic molecular theory? A. The size of a gas particle is negligibly small. B. The average kinetic energy of a gas particle is inversely proportional to the temperature in Kelvin. C. Gas particles do not collide with each other. D. All gas molecules are attracted to each other. Question #: 21 Which statement is true regarding the rate of effusion of N 2 (g) and Ne(g) from a container? A. N 2 will effuse at the same rate as Ne. B. N 2 will effuse faster than Ne. C. N 2 will effuse slower than Ne. D. N 2 will not effuse from the container but Ne will effuse. Question #: 22 Select two conditions that cause a real gas to act less than ideal. A. high pressure B. high temperature C. low temperature D. low pressure Question #: 23
16 Which of the following statements about the nature of energy is false? A. Thermal energy is a specific type of kinetic energy associated with molecular motion. B. Energy is absorbed by a system during an endothermic reaction. C. Energy can be created or destroyed in a chemical reaction. D. Energy is the capacity to do work. Question #: 24 If a system does 430 kj of work and absorbs 250 kj of heat, what is the change in internal energy (ΔE) of the system? A. 180 kj B. 180 kj C. 680 kj D. 680 kj Question #: 25 A tanker truck carrying 1.30 x 10 2 kg of 18.4 M sulfuric acid tips over and spills its load. If the density of H 2 SO 4 is 1.84 kg/l, how many kilograms of sodium hydroxide (NaOH, molar mass = 40.0 g/mol) are needed to neutralize the acid? 1 kilograms Give your answer using the correct number of significant figures and use the format 2.22E2 or 2.22E-2 for scientific notation E2
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