# Chapter 3 Test Practice DO NOT WRITE ON THIS PRACTICE EXAM

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1 Chapter 3 Test Practice MOORE DO NOT WRITE ON THIS PRACTICE EXAM 1. A sample of an element has a mass of grams and a volume of 3.8 cubic centimeters. To which number of significant figures should the calculated density of the sample be expressed? 9. The diagram below represents a Celsius thermometer recording a certian temperature. A) 5 B) 2 C) 3 D) 4 2. Which quantity of heat is equal to 200. joules? A) 20.0 kj B) 2.00 kj C) kj D) kj 3. A temperature of 37 C is equivalent to a temperature of A) 98.6 K B) 236 K C) 310. K D) 371 K 4. Which kelvin temperature is equal to 56 C? A) -329 K B) -217 K C) 217 K D) 329 K 5. Which kelvin temperature is equivalent to 24ºC? A) 226 K B) 249 K C) 273 K D) 297 K 6. A student calculates the density of an unknown solid. The mass is grams, and the volume is 8.21 cubic centimeters. How many significant figures should appear in the final answer? A) 1 B) 2 C) 3 D) 4 7. Which mass measurement contains four significant A) g B) g C) 1003 g D) 3870 g 8. Expressed to the correct number of significant figures, the sum of two masses is grams. Which two masses produce this answer? A) g g B) g g C) g g D) g g What is the correct reading of the thermometer? A) 5ºC B) 4.3ºC C) 0.3ºC D) 4ºC 10. During a laboratory experiment, a sample of aluminum is found to have a mass of grams and a volume of 4.6 milliliters. What is the density of this sample, expressed to the correct number of significant A) g/ml B) 2.72 g/ml C) 3 g/ml D) 2.7 g/ml 11. Which quantity is equivalent to 50 kilojoules? A) 5000 J B) 0.05 J C) J D) J 12. One kilojoule is the same as A) Joule B) 0.01 Joule C) 100 Joules D) 1,000 Joules 13. How many kilojoules are equivalent to 10 Joules? A) kj B) 0.01 kj C) 1000 kj D) 10,000 kj

2 14. The measurement gram, rounded to three significant figures, is expressed as A) 0.41 g B) g C) g D) g 15. A solution contains grams of a solid dissolved in 50.0 milliliters of water. What is the number of grams of solid dissolved per milliliter of water, rounded to the correct number of significant A) 0.25 g/ml B) g/ml C) 0.3 g/ml D) g/ml 16. Which measurement contains a total of three significant A) 0.12 B) 012 C) 120 D) What is the product of (2.324 cm 1.11 cm) expressed to the correct number of significant A) 2.58 cm 2 B) cm 2 C) cm 2 D) cm What is the quotient of 8.01 grams divided by grams, expressed to the correct number of significant A) 2.6 B) 2.56 C) D) Which quantity expresses the sum of the given masses to the correct number of significant 20. The volume of a gas sample is 22.4 liters at STP. The density of the gas is 1.34 grams per liter. What is the mass of the gas sample, expressed to the correct number of significant A) 16.7 g B) 17 g C) 30 g D) 30.0 g 21. Which measurement contains three significant A) 0.08 cm B) cm C) 800 cm D) 8.08 cm 22. The mass of a solid is 3.60 grams and its volume is 1.8 cubic centimeters. What is the density of the solid, expressed to the correct number of significant A) 2 g/cm 3 B) 2.0 g/cm 3 C) 0.5 g/cm 3 D) 0.50 g/cm A student collected the data shown below to determine experimentally the density of distilled water. Mass of graduated cylinder + distilled H2O sample g Mass of empty graduated cylinder g Mass of distilled H2O sample... g Volume of distilled H2O sample ml Based on the experimental data collected, what is the density of the distilled water? 24. Which measurement contains a total of three significant A) g B) g C) 1,205 g D) 12,050g 25. Given: (52.6 cm) (1.214 cm) What is the product expressed to the correct number of significant A) 64 cm 2 B) 63.9 cm 2 C) cm 2 D) cm When 5.0 grams of solute is added to 25.0 grams of water at 35.0ºC, the temperature rises to 35.4ºC. What is the temperature change per gram of solute, expressed to the correct number of significant A) 0.08 ºC/g B) ºC/g C) 8.0 ºC/g D) 8.00 ºC/g

3 27. The solid object shown below has a mass of grams. What is the density of the object to the correct number of significant A) 0.22 g/cm 3 B) g/cm 3 C) 4.5 g/cm 3 D) g/cm In a laboratory exercise to determine the density of a substance, a student found the mass of the substance to be 6.00 grams and the volume to be 2.0 milliliters. Expressed to the correct number of significant figures, the density of the substance is A) g/ml B) 3.00 g/ml C) 3.0 g/ml D) 3 g/ml 29. Which volume measurement is expressed in four significant A) 5.50 ml B) 550. ml C) 5,500 ml D) 5,500. ml 30. When grams of X reacts completely with 3.2 grams of Y, Z is the only product of the reaction. What is the total mass of Z, expressed to the proper number of significant A) g B) 4.46 g C) 4.5 g D) 5 g 31. The following weighings were made during a laboratory exercise: Mass of evaporating dish g Mass of sugar sample g What is the total mass of the evaporating dish plus the sample, expressed to the proper number of significant A) g B) g C) 60.9 g D) 61 g 32. Which mass measurement contains a total of three significant A) 22.0 g B) g C) 220 g D) 2200 g 33. What is the sum of g g g to the correct number of significant digits? A) 7 g B) 7.4 g C) 7.44 g D) g 34. Which measurement has the greatest number of significant A) mg B) 60.6 mg C) 606 mg D) mg 35. A student titrates milliliters of hydrochloric acid of unknown molarity with M NaOH. It takes milliliters of base to exactly neutralize the acid. If the student follows the rules for significant figures in determining the molarity of the acid, what should her answer be? A) 2.10 M B) 2.11 M C) M D) M 36. Which measurement contains three significant A) 0.05 g B) g C) g D) g 37. A cube has a volume of 8.0 cm 3 and a mass of 21.6 grams. The density of the cube, in grams per cubic centimeter, is best expressed as A) 2.7 B) 2.70 C) 0.37 D) A student measures the mass and volume of a piece of aluminum. The measurements are 25.6 grams and 9.1 cubic centimeters. The. student calculates the density of the aluminum. What is the percent error of the student s calculated density of aluminum? A) 1% B) 2% C) 3% D) 4% 39. A student intended to make a salt solution with a concentration of 10.0 grams of solute per liter of solution. When the student s solution was analyzed, it was found to contain 8.90 grams of solute per liter of solution. What was the percent error in the concentration of the solution? A) 1.10% B) 8.90% C) 11.0% D) 18.9%

4 40. A student calculated the percent by mass of water in a hydrate as 14.2%. A hydrate is a compound that contains water as part of its crystal structure. If the accepted value is 14.7%, the student s percent error was A) 100 B) 100 C) 100 A) 0.11% B) 1.1% C) 11% D) 4.0% D) A student determined in the laboratory that the percent by mass of water in CuSO 5H2O is 40.0%. If the accepted value is 36%, what is the percent of error? 42. A student found the boiling point of a liquid to be. If the liquid's actual boiling point is, the experimental percent error is equal to A) B) C) D) 43. A student determined the percentage of water of hydration in BaCl2 2H2O by using the data in the table below. The accepted percentage value for the water of hydration is 14.75%. What is the student's percent error? A) 1.04% B) 6.00% C) 6.59% D) 7.05% 44. A student calculated the percent by mass of water in a sample of to be, but the accepted value is. What was the student's percent error? 45. A student determined that the percent of H2O in a hydrate was 39.0%. The percent of H2O in this hydrate is 36.0% according to an accepted chemistry reference. What is the student's percent of error? A) 9.1% B) 8.3% C) 3.0% D) 11% 46. In an experiment, a student found that the percent of oxygen in a sample of was. If the accepted value is, the experimental percent error is 47. A laboratory experiment was performed to determine the percent by mass of water in a hydrate. The accepted value is 36.0% water. Which observed value has an error of 5.00%? A) 31.0% water B) 36.0% water C) 37.8% water D) 41.0% water 48. A student determined the heat of fusion of water to be 88 calories per gram. If the accepted value is 80. calories per gram, what is the student's percent error? A) 8.0% B) 10.% C) 11% D) 90.% 49. A student in a laboratory determined the boiling point of a substance to be 71.8 C. The accepted value for the boiling point of this substance is 70.2 C. What is the percent error of the student's measurement? A) 1.60% B) 2.28% C) 2.23% D) 160.% 50. The accepted value for the molar volume of a gas is 22.4 liters. In a laboratory experiment, a student determines the value to be 24.8 liters. What is the percent error of the student's measurement? A) 0.120% B) 0.107% C) 10.7% D) 12.0% 51. Using atomic masses given in the Reference Tables for Chemistry, the molecular mass for O2(g) is By experiment a student measured the mass of O2(g) to be What is the percent error in the student's result? A) 1.25% B) 1.43% C) 12.5% D) 14.3%

5 52. A student determined in the laboratory that one mole of KMnO4 had a mass of grams. The mass of one mole of KMnO4 in an accepted chemistry reference is grams. What is the percent error of the mass of one mole of KMnO4 as determined by the student? A) 0.787% B) 7.87% C) 8.54% D) 13.5% 53. A student determines that the gram formula mass of CdO is grams. If the accepted value is grams, what is the students percent error? A) 0.366% B) 3.66% C) 3.80% D) 4.53% 54. If the observed value for a density is 0.80 g/ml and the accepted value is 0.70 g/ml, what is the percent error? A) 0.17% B) 0.14% C) 17.% D) 14.% 55. In a laboratory experiment, the melting point of compound A was determined to be 82.6ºC. If the accepted value is 80.5ºC, what is the percent error in this determination? (Show proper significant figures) A) 2.5 B) 2.54 C) 2.6 D) In an experiment the gram atomic mass of magnesium was determined to be Compared to the accepted value 24.3, the percent error for this determination was A) B) 1.65 C) 24.7 D) Which sample of ethanol has particles with the highest average kinetic energy? A) 10.0 ml of ethanol at 25 C B) 10.0 ml of ethanol at 55 C C) ml of ethanol at 35 C D) ml of ethanol at 45 C 58. In which sample is the average kinetic energy of the particles greatest? A) 10. ml of HCl(aq) at 25 C B) 15 ml of HCl(aq) at 20. C C) 10. ml of H2O( ) at 35 C D) 15 ml of H2O( ) at 30. C 59. The temperature of a sample of nitrogen gas is a measure of the molecules' average A) activation energy B) potential energy C) kinetic energy D) ionization energy 60. At which temperature does an aqueous solution of LiCl have the highest average kinetic energy? A) 100ºC B) 200ºC C) 273 K D) 373 K 61. Solid A at 80ºC is immersed in liquid B at 60ºC. Which statement correctly describes the energy changes between A and B? A) A releases heat and B absorbs heat. B) A absorbs heat and B releases heat. C) Both A and B absorb heat. D) Both A and B release heat. 62. In which beaker would the particles have the highest average kinetic energy? 63. The average kinetic energies of the molecules in two gas samples could best be compared by measuring their A) temperatures B) volumes C) pressures D) densities 64. The temperature of a substance is a measure of its particles A) average potential energy B) average kinetic energy C) specific heat D) total energy 65. The molecules of which substance have the highest average kinetic energy? A) He(g) at 0ºC B) CO2(g) at 20ºC C) HCl(g) at 40ºC D) N2(g) at 60ºC

6 66. The compound whose molecules have the highest average kinetic energy is A) NO(g) at 25 C B) N2O(g) at 15 C C) NO2(g) at 30 C D) N2O3(g) at 20 C 67. Which temperature is equal to 120. K? A) 153 C B) 120. C C) +293 C D) +393 C 68. The temperature 30. K expressed in degrees Celsius is A) 243ºC B) 243ºC C) 303ºC D) 303ºC 69. At standard pressure, the difference between the freezing point and the boiling point of water, in Kelvin, is A) 100 B) 180 C) 273 D) Which temperature is equal to +20 K? A) 253ºC B) 293ºC C) 253 C D) 293 C

7 Answer Key Unit 2 Test 1. B 2. C 3. C 4. D 5. B 6. C 7. C 8. C 9. B 10. D 11. D 12. D 13. B 14. B 15. B 16. D 17. A 18. B 19. C 20. D 21. D 22. B 23. C 24. B 25. B 26. A 27. C 28. C 29. D 30. C 31. B 32. A 33. C 34. A 35. C 36. D 37. A 38. D 39. C 40. C 41. C 42. A 43. D 44. C 45. B 46. D 47. C 48. B 49. B 50. C 51. C 52. C 53. B 54. D 55. C 56. B 57. B 58. C 59. C 60. B 61. A 62. C 63. A 64. B 65. D 66. C 67. A 68. B 69. A 70. A

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