CHEM 5414 Analytical Principles, Exam 2 Review Problems with Answers

Exam 2 Review Problems 1) If a solution has a temperature of 355 K, what is its temperature in degrees celsius? A) 628°C B) 165°C C) 82°C D) 179°C E) 279°C 2) How many significant figures are in 1009.630 mL? A) 3 B) 6 C) 4 D) 7 E) 5 3) How many significant figures are in 3.408 x 104 m? A) 5 B) 7 C) 8 D) 3 E) 4 4) How many significant figures are in the measurement, 0.0005890 g? A) 8 B) 4 C) 6 D) 7 E) 5 5) What answer should be reported, with the correct number of significant figures, for the following calculation? (433.621 ‐ 333.9) × 11.900 A) 1.187 × 103 B) 1.19 × 103 C) 1.1868 × 103 D) 1.18680 × 103 E) 1.186799 × 103 6) How many mg does a 433 kg sample contain? A) 4.33 × 108 mg B) 4.33 × 107 mg C) 4.33 × 10‐3 mg D) 4.33 × 106 mg E) 4.33 × 10‐4 mg 7) How many cm3 are contained in 3.77 × 104 mm3? A) 3.77 × 106 cm3 B) 3.77 × 104 cm3 C) 3.77 × 1020 cm3 D) 3.77 × 10‐10 cm3 E) 3.77 × 101 cm3 8) A recipe requires 1.89 liters of milk for a soup base. How many quarts are needed? A) 1.89 qts B) 2.00 qts C) 1.79 qts D) 2.15 qts E) 2.10 qts 9) If an object has a density of 8.65 g/cm3, what is its density in units of kg/m3? A) 8.65 × 101 kg/m3 B) 8.65 × 10‐3 kg/m3 C) 8.65 × 10‐7 kg/m3 D) 8.65 × 103 kg/m3 E) 8.65 × 10‐1 kg/m3 10) How many cm are in 22.2 ft? A) 677 cm B) 105 cm C) 4.70 cm D) 56.4 cm E) 0.728 cm 11) If the walls in a room are 955 square feet in area, and a gallon of paint covers 15 square yards, how many gallons of paint are needed for the room? (3 ft = 1 yd) A) 2.3 gallons B) 47 gallons C) 24 gallons D) 21 gallons E) 7.1 gallons Page 1 of 4 12) Gas is sold for $1.399 per liter in Toronto, Canada. charged in Canadian dollars? A) $63.54 B) $16.79 Your car needs 12.00 gallons. How much will your credit card be C) $4.44 D) $67.15 13) A piece of metal ore weighs 8.25 g. When a student places it into a graduated cylinder containing water, the liquid level rises from 21.25 mL to 26.47 mL. What is the density of the ore? A) 3.21 g/mL B) 0. 633 g/mL C) 0.3 12 g/mL D) 1. 58 g/mL 14) How many of the following numbers contain 3 significant figures? 9.040 0.0 400 9.05 × 1024 0. 408 A) one B) two C) three D) four 15) Without using a calculator, solve the following problem: A) 1 × 1032 B) 1 × 10‐4 C) 1 × 105 D) 1 × 1023 16) A fishing boat accidentally spills 3.0 barrels of diesel oil into the ocean. Each barrel contains 42 gallons. If the oil film on the ocean is 2.5 × 102 nm thick, how many square meters will the oil slick cover? A) 1.9 × 106 m2 B) 1.9 × 10‐3 m2 C) 1.9 × 107 m2 D) none of these 17) The estimated costs for remodelling the interior of an apartment are: three 1‐gallon cans of paint at each , two paint brushes at each , and for a helper. The total estimated cost with the appropriate significant figures is B) 194 C) 193.7 D) 1.9 × E) 193.72 A) 2 × 18) How many liters of air are in a room that measures A) 2.68 × B) 2.49 × and has an C) 8.84 × 105 8.00 ft ceiling? D) 92.8 E) 26.8 19) What is the mass of a 468 mL sample of ethanol? The density of ethanol is 0.789 g/mL. A) 739 g B) 369 g C) 468 g D) 593 g E) 234 g 20) Convert 21.8 in3 to liters. (2.54 cm = 1.00 in) A) 0.0554 L B) 1.33 × 103 L E) 0.357 L C) 8.58 × 103 L D) 8.58 L 21) An elephant's bathtub is 8.0 feet long, 2.5 yards wide, and 70 inches deep. What is the capacity of the elephant's bathtub in U.S. quarts? A) 3.4 × 104 qt B) 9.3 × 103 qt C) 34 qt D) 1.1 × 104 qt E) 2.2 × 104 qt 22) Convert 35 ft/s to units of m/s. A) 4.2 m/s B) 11 m/s C) 1.65 m/s D) 0.074 m/s E) 1100 m/s 23) Determine the number of cm3 in 21.0 U.S. qt. A) 20.0 B) 0.0199 C) 5.548 D) 19,900 E) 10.0 24) What mass of sugar, in grams, would be obtained from the evaporation of water from 1.5 kg of a sugar solution which is 10.5% sugar by mass? B) 0.158 g C) 0.1575 g D) 160 g E) 157.5 g A) 15.8 g 25) A block of wood has dimensions of and has a mass of 3.0 kg. What is the density of the wood? Page 2 of 4 A) 0.071 g/mL B) 1.4 g/mL C) 0.71 g/mL D) 1400 g/mL E) 140 g/mL 26) A 2.0 gal flask weighs 4.0 lbs when empty. When it is filled with liquid, the flask weighs 4536.0 g. What is the density of the liquid in g/mL? (1 gal = 3.785 L, 1 lb = 453.6 g) A) 0.60 g/mL B) 0.14 g/mL C) 0.72 g/mL D) 0.071 g/mL E) 0.36 g/mL 27) What is the answer to the correct number of significant figures of the following calculation? A) 25.0 B) 25.01 C) 30 D) 2.84 28) Energy that is associated with the position or composition of an object is called A) thermal energy B) chemical energy C) potential energy E) 25 D) kinetic energy 29) Give the units of heat capacity. A) mol/ °C B) J/g °C C) g/ °C D) J/°C E) J/mole °C 30) Give the units of specific heat capacity. A) mol/ °C B) 1/°C C) J/g °C D) g/ °C E) J/mole °C 31) Which of the following (with specific heat capacity provided) would show the smallest temperature change upon gaining 200.0 J of heat? A) 25.0 g Au, CAu = 0.128 J/g°C B) 50.0 g Cu, CCu = 0.385 J/g°C C) 25.0 g Ag, CAg = 0.235 J/g°C D) 50.0 g Al, CAl = 0.903 J/g°C E) 25.0 g granite, Cgranite = 0.79 J/g°C 32) Calculate the amount of heat (in kJ) required to raise the temperature of a 79.0 g sample of ethanol from 298.0 K to 385.0 K. The specific heat capacity of ethanol is 2.42 J/g°C. A) 16.6 kJ B) 12.9 kJ C) 73.6 kJ D) 28.4 kJ E) 57.0 kJ 33) A piece of iron (mass = 25.0 g) at 398 K is placed in a styrofoam coffee cup containing 25.0 mL of water at 298 K. Assuming that no heat is lost to the cup or the surroundings, what will the final temperature of the water be? The specific heat capacity of iron = 0.449 J/g°C and water = 4.18 J/g°C. A) 308 K B) 287 K C) 348 K D) 388 K E) 325 K 34) A 5.00‐g sample of liquid water at 25.0 C is heated by the addition of 84.0 J of energy. The final temperature of the water is __________ °C. The specific heat capacity of liquid water is A) 25.2 B) 4.02 C) ‐21.0 D) 95.2 E) 29.0 35) The specific heat capacity of liquid water is 4.18 J/g‐K. How many joules of heat are needed to raise the temperature of 5.00 g of water from 25.1°C to 65.3°C? D) 2.08 × E) 1.89 × A) 48.1 J B) 840 J C) 54.4 J J J Page 3 of 4 1) C 2) D 3) E 4) B 5) B 6) A 7) E 8) B 9) D 10) A 11) E 12) A 13) D 14) C 15) D 16) A 17) B 18) B 19) B 20) E 21) D 22) B 23) D 24) D 25) C 26) E 27) E 28) C 29) D 30) C 31) D 32) A 33) A 34) E 35) B Page 4 of 4