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1 Chemistry First Semester Exam 2015 Multiple Choice Identify the choice that best completes the statement or answers the question. Record the answer on both the clicker and this test. Use this graph to answer the following question. 1. Which variable is the dependent variable on the graph above? a. the x-axis b. time c. energy d. temperature 2. The state of matter in which a material has neither a definite shape nor a definite volume is the state. a. gaseous b. liquid c. elemental d. solid Use this table to answer the following question. Trial A B kpa 40 ml 2 50 kpa 80 ml kpa 20 ml kpa 10 ml 5 25 kpa 160 ml 4. The symbol for the element potassium is. a. Pt b. P c. K d. S e. Ca 5. The abbreviation mm represents a. micrometer. b. millimeter. c. milliliter. d. meter. 6. Express the quantity of meters in centimeters? a cm b cm c. 7.5 cm d cm 7. Give the proper reading indicated by the thermometer below. 3. Column A in the table indicates what type of measurement? a. volume b. temperature c. pressure d. mass a o C b o C c o C d o C Page 1 of 8
2 Use the table below to answer the following questions. 8. What is the mass of the testtube in the iron experiment (Fe)? a g b g c g d g 9. Calculate the heat lost by the aluminum in the previous data table if the specific heat capacity of aluminum is 0.90 J/g o C.(HINT: Energy = m TC p ) a J b J c J d J 10. Calculate the T of the water in the copper(cu) experiment. a. 7.2 o C b o C c. 7.1 o C d o C 11. In a calorimetry experiment 50.0 g of 45.0 o C water and 50.0 g of 25.0 o C water are mixed together. Which of the following temperatures are the most probable temperature of the mixture? a o C b o C c o C d o C 12. In the calorimetry experiment, how would you know energy was transferred from the hot metal to the water in the calorimeter? a. the water stopped boiling b. the temperature of the calorimeter decreased c. the volume of the calorimeter increased d. the temperature of the calorimeter increased 13. What is an indicator that a substance has lost energy? a. a negative value for energy b. a negative value for temperature change c. a positive value for energy d. a positive value for temperature change e. both a and b f. both c and d 14. The temperature of 25 C is in Kelvins. a. 298 b. 138 c. 166 d A temperature of K is the same as 63 F. a. 17 b. 276 c. 290 Page 2 of 8
3 16. "Absolute zero" refers to. a. 0 Kelvin b. 0 Fahrenheit c. 0 Celsius d. C + 9/5( F 32) e C 17. The density of silver is 10.5 g/cm 3. A piece of silver that occupies a volume of 23.6 cm 3 would have a mass of g. a. 248 b c d. 112 e The number has significant figures. a. 2 b. 3 c. 5 d. 6 e The correct answer (reported to the proper number of significant figures) to the following is = a. 20. b c d e There should be significant figures in the answer to the following computation. a. 1 b. 2 c. 3 d. 4 e The quantity m is the same as 3 km. a b. 300 c d e Gold has a density of kg/cm 3. What volume (in cm 3 ) would be occupied by a 33.3 g sample of gold? a b x 10 4 c d e In which one of the following numbers are none of the zeros significant? a b c d e A cube of an unknown metal measures 1.61 mm on one side. The mass of the cube is 36 mg. Which of the following is most likely the unknown metal? a. copper b. rhodium c. niobium d. vanadium e. zirconium 25. Accuracy refers to. a. how close a measured number is to zero b. how close a measured number is to the calculated value c. how close a measured number is to other measured numbers d. how close a measured number is to the true value e. how close a measured number is to infinity 26. In which one of the following numbers are all of the zeros significant? a b c d e Page 3 of 8
4 27. Round the number to three significant figures. a b c d e Round the following number to four significant figures and express the result in standard exponential notation: a b c d e Which is the correct measurement for the location marked by the arrow? a b c d The graph represents the sales data for a particular product. In which week were 8 units sold? Sales (units) a. 3 rd week b. 4 th week c. 6 th week d. 9 th week Weeks 31. The accepted value for the density of iron is 7.87 g/cm 3. A student records the mass of a cm 3 block of iron as grams. What is the percent error for the density measurement? a. 19.4% b. 7.69% c. 2.29% d. 2.34% 32. The accepted value for a quantity is 5.67 g. If the measured value is 5.89 g, what is the percent error? a. 1.04% b. 3.74% c. 3.74% d. 3.88% 33. Which is the correct conversion for a temperature of 67.3 C? a K b F c F d F 34. The product of cm and cm, expressed in scientific notation is. a cm b cm c cm d cm 35. The SI unit of heat and energy is the. a. calorie b. heat c. joule d. watt 36. What does T stand for? a. increasing temperature b. decreasing temperature c. change in temperature d. triangle temperature 37. If the temperature remains constant, V 1 and P 1 represent the original volume and pressure, and V 2 and P 2 represent the new volume and pressure, what is the mathematical expression for Boyle s law? a. P 2 V 1 = V 2 P 1 b. V 1 V 2 = P 1 P 2 c. V 2 P 2 = V 1 P 1 d. Page 4 of 8
5 38. Of the three gases represented on the graph above which has a volume of 25 Liters, but a temperature less than 273 K? a. P = 0.5 atm b. P = 1 atm c. P = 2 atm d. none of these 39. The three plots above show an extrapolation to a. V = 1 L b. T = 0 K c. T = 20 K d. P = 2 atm 40. If the plot above was to be used to predict ideal gas behavior one could conclude: a. gas particles must have no volume at a temperature of 0 K b. that all gases must have direct relationships c. that all gases must have inverse relationships d. that 80 K is the lowest possible temperature for these gases 41. Calculate the approximate volume of a mol sample of gas at 15.0 C and a pressure of 1.10 atm. a L b L c L d. 129 L Page 5 of 8
6 42. Which of the graphs above represent data that is linear and has a direct relationship? a. A b. B c. C d. D 43. Which graph above accurately represents the raw pressure - volume data from the Boyle s Law Lab? a. A b. B c. C d. D 44. What type of relationship does Boyle s Law data represent? a. reverse b. straight c. direct d. Inverse 45. Which of the images above represent a gas at higher pressure? a. image 1 b. image 2 c. both have the same pressure d. volume of 1 equals the volume of 2 Page 6 of 8
7 Name: Date: Per: S#: Write your name above and follow the directions; don t forget to turn this in with your scantron Problems For the following calculation problems show all work and answers on this sheet. It is required for credit! Type answer into clicker if they are available. 46. A student measures the length of a iron rod five times and records the data as: a cm b cm c cm d cm e cm The labeled value of the iron rod is cm. Calculate the percent error for the data recorded by the student. 47. A sample of oxygen occupies 560 ml when the pressure is mm Hg. At constant temperature, what volume does the gas occupy when pressure falls to mm Hg? 48. The volume of a gas is 5.00 L when the temperature is 5.0 C. If the temperature is increased by 10.0 C without changing the pressure, what is the new volume? 49. The volume of a gas is ml when the pressure is 1.00 atm. At the same temperature, what is the pressure at which the volume of the gas is 2.0 L? Short Answer 50. A student experimentally determines the value for absolute zero as -288 o C, but realizes the scientifically accepted value is -273 o C. Explain how one would determine if this result is considered right. Be sure to use appropriate scientific terminology! Page 7 of 8
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