CHEM 162 Lab Exam 1 Study Questions with Correct Answers Expert Graded A+

CHEM 162 Lab Exam 1 Study Questions with Correct Answers Expert Graded A+ 1. A possible rate law for: SO2Cl2 → SO2 + Cl2 is: A. rate = k[SO2Cl2]X B. rate = k[SO2Cl2]y[Cl2]X C. rate = k[SO2]y[Cl2]X - ANSWER A. rate = k[SO2Cl2]X 2. What is the molar mass of 3.93 g of a gas that occupies 2.00L at STP? A. 44 B. 0.35 C. 11.4 - ANSWER A. 44 3. In a solution of 5.0g sugar and 100.0g water, water is the: A. solution B. solute C. solvent - ANSWER C. solvent 4. The density of CO2 gas at STP is: A. 986 g/L B. 1.96 g/L C. 0.509 g/L - ANSWER B. 1.96 g/L 5. Some elements are more reactive than others True False - ANSWER True 6. 500mL of a gas at 25.0oC will have a volume of 1.20L at: A. 124 K B. 900 K C. 442 oC - ANSWER C. 442 oC 7. For the reaction: X + Y → Z ; the rate law is: rate = k[X]2[Y]. To double the reaction rate : A. double the concentration of Z B. double the concentration of Y C. double the concentration of X - ANSWER double the concentration of Y 8. 115 grams of H2SO4 is dissolved in 500.0mL of water. What is the Normality of the resulting solution? (assume all H+ enter the solution) A. 2.3 B. 4.7 C. 11.5 - ANSWER B. 4.7 9. The initial volume of a gas cylinder is 750.0 mL. If the pressure of a gas inside the cylinder changes from 840.0 mmHg to 360.0 mmHg, what is the final volume the gas occupies? A. 630.0 mL B. 321.4 mL C. 3.151 L D. 1.750 L E. none of the above - ANSWER D. 1.750 L 10.At STP, 12.69 g of a noble gas occupies 14.09 L. What is the identity of the noble gas? A. Ar B. He C. Kr D. Ne E. not enough information - ANSWER D. Ne 11.A barometer uses mercury because: A. it is a convenient, safe, lightweight material. B. it is the only liquid metal at room temperature. C. it is the traditional substance used, water could be as easily used. D. the density of mercury is very large which allows the barometer to be short. E. All of the above are true. - ANSWER D. the density of mercury is very large which allows the barometer to be short. 12.The pressure of a gas is 1216 mmHg. What is its pressure in atm? A. 1960 atm B. 912000 atm C. 1.6 atm - ANSWER C. 1.6 atm 13.O2 gas at 25oC has pressure of 1.1 atm has density of: A. 0.0019 g/L B. 0.72 g/L C. 1.4 g/L - ANSWER C. 1.4 g/L 14.One mole O2(g) at 0oC and 1atm pressure will have a volume of 22.4L True False - ANSWER true 15.Pressure exerted by a gas above the surface of liquid, describes: A. vapor pressure B. boiling point C. atmospheric pressure - ANSWER A. vapor pressure 16.15.0g of a substance at -60.0oC is heated to 0oC. Calculate the heat, in calories, gained by the substance. (boiling point -50.0oC, freezing point - 84oC, heat of fusion 7.7cal/g, heat of vaoprization 30.0 cal/g , specific heat(solid) 0.50cal/goC , specific heat (liquid) 0.70cal/goC, specific heat (gas) 0.80cal/goC, you may not need to use all this information) A. 1155 B. 2356 C. 6300 - ANSWER A. 1155