MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

Transcription

1 Chem 2A_Ch2_PT MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) When the prefix milli is used in the metric or SI system, a fundamental unit of measurement is multiplied by what factor? A) 10-2 B) 103 C) 10-3 D) 106 E) ) 2) When the prefix centi is used in the metric system, a fundamental unit of measurement is multiplied by what factor? A) 103 B) 10-3 C) 106 D) 10-2 E) ) 3) How many meters are there in one kilometer? A) 10-6 B) 10-3 C) 106 D) 10-2 E) 103 3) 4) The abbreviation for the metric unit used to measure mass is A) L B) g C) m D) g/cm3 E) K 4) 5) A student weighed a solid sample. The units for this measurement are most likely to be recorded as 5) A) liters. B) grams per cubic centimeter. C) meters. D) grams. E) Kelvins. 6) The amount of matter in an object is its A) specific gravity. B) weight. C) mass. D) density. E) volume. 6) 7) The measurement most likely to describe the amount of pain reliever in a headache tablet is A) 500 mg. B) 325 mg/ml. C) 0.25 L. D) 1.5 kg. E) 1.00 ml. 7) 1

2 8) Which value is closest to the mass of a 2-pound box of laundry detergent? A) 200 g B) cg C) 1 kg D) ng E) mg 8) 9) Which measurement represents the largest quantity? A) μg B) 47.3 mg C) g D) kg E) 4730 ng 9) 10) Which measurement represents the smallest quantity? A) g B) 2950 ng C) μg D) kg E) 29.5 mg 10) 11) The metric unit used to measure volume is the A) gram per cubic centimeter. B) gram. C) meter. D) liter. E) Kelvin. 11) 12) Which of the following represents the largest unit? A) deciliter B) kiloliter C) dekaliter D) milliliter E) megaliter 12) 13) The units most likely to be used to measure the amount of alcohol to be added to a small test tube are 13) A) g. B) kg. C) ml. D) L. E) cm. 2

3 14) In an introductory laboratory exercise, a student was asked to measure the volume of soda in a partially filled can in metric units. Which value below is most likely to be correct? 14) A) 325 ml B) 550 μl C) 6.0 x 106 nl D) 1.0 kl E) 2.5 L 15) The SI unit for volume is and the metric unit for volume is. A) m3; cm3 B) cc; L C) m3; L D) ml; cc E) L; m3 15) 16) Which value is closest to the amount of gasoline in a small car with a full tank (which contains about 13 gallons)? 16) A) 50 L B) 450 ml C) 85 μl D) 12 kl E) dl 17) 125 cl is the same as all of these except A) 12.5 deciliter. B) 125 cubic liter. C) 1.25 liter. D) 1250 milliliter. E) 125 centiliter. 17) 18) Which of the following measurements has three significant figures? A) g B) 1,207 g C) g D) g E) g 18) 19) What is the numerical value of ? Express your answer using the correct number of significant figures. 19) A) B) 1.47 C) 1.5 D) E) none of the above 3

4 20) A laboratory technician reports that the mass of a growth removed from a patient is g. How many significant figures does this measurement contain? 20) A) 5 B) 2 C) 3 D) 4 E) none of the above 21) Which of the following numbers contains four significant figures? A) 23,011.0 B) C) D) 230,110 E) ) 22) Which of the following numbers contains five significant figures? A) B) C) 4,910,000 D) 49,100 E) ) 23) What is the total length of two pieces of tubing which measure 4.5 cm and cm? Express the answer to the correct number of significant figures. 23) A) 8 cm B) cm C) cm D) cm E) 7.7 cm 24) Find the difference between two masses measured as grams and grams. Express the answer to the correct number of significant figures. 24) A) grams B) 7.6 grams C) 8.0 grams D) 8 grams E) 7.63 grams 25) What is the area of a piece of metal foil that measures 43.9 cm by cm? Express the answer to the correct number of significant figures. A) cm2 B) cm2 C) 1280 cm2 D) cm2 E) 128 cm2 25) 4

5 26) What is the numerical value of significant figures. A) B) 10-3 C) D) E) ? Express your answer using the correct number of ) 27) The volume of a gas sample is recorded as L. How many significant figures is this? A) 3 B) 2 C) 5 D) 4 E) none because this is an exact number 27) 28) What is the total length of two pieces of rubber tubing which are 7.69 cm and cm in length? Express this answer to the correct number of significant figures. 28) A) cm B) 12 cm C) cm D) cm E) 11.7 cm 29) Which choice best describes the degree of uncertainty in the measurement g? A) The uncertainty cannot be determined without additional information. B) The quantity is exact. C) ±0.01 g D) ±1.00 g E) ±0.10 g 29) 30) Which choice best describes the degree of uncertainty in the measurement g? A) The uncertainty cannot be determined without additional information. B) The quantity is exact. C) The measurement is between and g. D) The measurement is between 3.99 and 4.01 g. E) The measurement is between and g. 30) 31) The number in conventional notation is A) B) C) D) E) ) 5

6 32) In scientific notation, the number 185,000,000 is A) B) C) D) E) ) 33) In scientific notation, the number is expressed as A) B) C) D) E) ) 34) What is written in decimal notation? A) B) 210,000 C) 2,100,000 D) E) ) 35) What is written in scientific notation? A) B) C) D) E) ) 36) What is the numerical value of ( )( )? A) B) C) D) 8.4 E) none of the above 36) 37) What is the numerical value of ( )( )? A) B) 16.0 C) D) E) ) 38) What is the numerical value of ? ) A) B) C) D) E)

7 39) What is the numerical value of ( )( )? ) A) B) C) D) 1.2 E) ) How many centimeters are contained in 12.5 inches? A) 4.92 cm B) 5.10 cm C) 492 cm D) 31.8 cm E) none of the above 40) 41) How many grams are contained in 1.20 pounds? A) 2.2 g B) 378 g C) 1.20 g D) 545 g E) 264 g 41) 42) How many inches are contained in 25.4 cm? A) 64.5 inches B) 0.10 inches C) 25.4 inches D) 10.0 inches E) 100 inches 42) 43) How many centimeters are there in one kilometer? A) 102 cm B) 101 cm C) 105 cm D) 10-5 cm E) 10-2 cm 43) 44) An analysis showed a sample to contain grams of lead. How many micrograms is this? A) μg B) μg C) μg D) μg E) μg 44) 45) In a density determination, a student measured ml of a liquid. How many liters is this? A) 11,460 L B) L C) x 10-3 L D) L E) L 45) 7

8 46) The conversion factor used to convert 15.0 inches to cm is 1 in 1 cm 2.54 in A) B) C) 2.54 cm 2.54 in 1 cm D) 1 cm 100 mm E) 2.54 cm 1 in 46) 47) The conversion factor used to convert 198 cm to inches is 1 cm 2.54 in 2.54 cm A) B) C) 100 mm 1 cm 1 in D) 1 in 2.54 cm E) 1 cm 2.54 in 47) 48) An extra-strength aspirin contains g of aspirin. How many grains is this? (1 grain = 64.8 mg) A) 13.0 grains B) 7.72 grains C) 32.4 grains D) grains E) 65.3 grains 48) 49) How many quarts are contained in ml? A) 2.10 quarts B) quart C) 426 quarts D) quarts E) 475 quarts 49) 50) How many pounds are contained in 84.0 kg? A) 38.0 lb B) lb C) 380 lb D) lb E) 185 lb 50) 51) A sample of an experimental medication was calculated to contain g of active drug. How many milligrams is this? 51) A) mg B) mg C) mg D) 392 mg E) mg 52) How many ng are there in 5.2 mg? A) ng B) ng C) ng D) ng E) ng 52) 8

9 53) The dosage of quinine when a 145-lb adult takes a 200.-mg tablet is μg drug per kg of body weight. A) B) 15.2 C) D) E) ) 54) An object weighs 37.4 kg. What does the object weigh in the english system? 1lb = g 54) A) 16,965 lb B) 82.5 lb C) lb D) lb 55) If gasoline sells for 95.4 cents per liter, what is its cost on a per gallon basis? 1 L = 1.06 q 55) A) $ B) $4.04 C) $3.60 D) $ ) 68 C is the same as A) 205 K. B) 321 K. C) 285 K. D) 158 K. E) 341 K. 56) 57) What temperature is 325 K on the Celsius scale? A) 52 C B) 598 C C) 126 C D) 617 C E) 344 C 57) 58) 95.0 F is the same as A) 203 C. B) 21 C. C) 35 C. D) 85 C. E) 171 C. 58) 59) What temperature is -10 C on the Fahrenheit scale? A) -6 F B) 14 F C) 26 F D) -18 F E) 263 F 59) 60) What temperature is 75 F on the Kelvin scale? A) 215 K B) 43 K C) 348 K D) 297 K E) 24 K 60) 61) What temperature do the celsius and fahrenheit scales read the same? A) 100 B) -100 C) -40 D) 25 E) Never 61) SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 62) Why is the number 32 (and not some other value) used in the formula for converting between Celsius and Fahrenheit temperatures? 62) 63) Why is the number 1.8 (and not some other value) used in the formula for converting between Celsius and Fahrenheit temperatures? 63) 64) Why is the number (and not some other value) used in the formula for converting between Celsius and Kelvin temperatures? 64) 9

10 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 65) How many calories are released when 500 g of water cools from 95.0 C to 25.0 C? A) 70.0 cal B) cal C) cal D) 35.0 cal E) cal 65) 66) If 75.0 g of water at 30.0 C absorbs 900 calories, the new temperature will be A) 18.0 C B) 42.0 C. C) 22.0 C. D) 160 C. E) 105 C. 66) 67) What is the density of a 600 ml liquid sample that weighs 450 g? A) 0.37 g/ml B) 1050 g/ml C) 1.33 g/ml D) 0.75 g/ml E) 270 g/ml 67) 68) Calculate the density of cyclohexane if a 50.0 g sample has a volume of 64.3 ml. A) g/ml B) 14.3 g/ml C) 1.29 g/ml D) g/ml E) g/ml 68) 69) A 35.0 ml sample of a liquid weighs 27.2 g. What is the density of the liquid? A) 7.80 g/ml B) 1.29 g/ml C) g/ml D) g/ml E) 62.2 g/ml 69) 70) What is the specific gravity of a liquid sample with a mass of 35.0 g and a volume of ml? A) 14.0 B) 2.5 C) 2.50 g/ml D) 21.0 E) 14.0 g/ml 70) 71) What is the volume of a gold nugget that weighs 2.20 kg? The density of gold is 19 g/cm3. A) cm3 B) 116 cm3 C) 8.60 cm3 D) 11.6 cm3 E) cm3 71) 10

11 72) What is the mass of 30.0 ml of a solution with a density of 1.60 g/ml? A) 48.0 g B) 53.3 g C) 18.8 g D) 31.6 g E) none of the above 72) 73) A 2.36 cm3 sample of an unknown metal weighs 18.5 g. What is the sampleʹs density? A) g/cm3 B) 7.84 g/cm3 C) cm3/g D) g / cm3 73) 74) Which of the following statements is true of specific gravity? A) Specific gravity is constant at any temperature. B) It has the units of g/cm3. C) Specific gravity is a measure of the reactivity index of a substance. D) Specific gravity is unitless because it is the density of one substance divided by the density of water. 74) 75) What is the specific heat of a metal if it takes 26.5 calories to raise the temperature of a piece weighing 50.0 g by 5.00 Celsius degrees? 75) A) 1.89 cal/g C B) 250 cal/g C C) cal/g C D) 133 cal/g C E) 6.63 cal/g C 76) What is the specific heat of a metal if it takes 48.4 calories to raise the temperature of a 45.0 g sample by 5.0 C? 76) A) cal/g C B) 5.34 cal/g C C) cal/g C D) 225 cal/g C E) 242 cal/g C SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 77) Explain how density can be used to determine the volume of carbon tetrachloride (which is a liquid at room temperature) needed to make a mixture using 37.2 of carbon tetrachloride. 77) 11

12 Answer Key Testname: UNTITLED1 1) C 2) D 3) E 4) B 5) D 6) C 7) A 8) C 9) B 10) B 11) D 12) E 13) C 14) A 15) C 16) A 17) B 18) C 19) C 20) A 21) B 22) E 23) E 24) B 25) C 26) A 27) A 28) D 29) C 30) E 31) D 32) E 33) D 34) D 35) C 36) C 37) C 38) A 39) C 40) D 41) D 42) D 43) C 44) A 45) D 46) E 47) D 48) B 49) D 50) E 12

13 Answer Key Testname: UNTITLED1 51) D 52) C 53) A 54) B 55) C 56) E 57) A 58) C 59) B 60) D 61) C 62) The 32 compensates for the fact that the Celsius scale uses zero as its reference point for the freezing point of water, but the Fahrenheit scale uses 32 as this reference point. 63) This value compensates for the different size of the two degrees. In the Celsius scale there are 100 degrees between the freezing point and the boiling point of water, but in the Fahrenheit scale there are 180 degrees to cover the same interval. The ratio of 180 to 100 is 1.8, so this correction factor is used in the formula. 64) This value compensates for the fact that the freezing point of water on the Celsius scale is degrees lower than on the Kelvin scale. Since Kelvins are the same size as Celsius degrees, no other correction factors are needed. 65) C 66) B 67) D 68) E 69) D 70) B 71) B 72) A 73) B 74) D 75) C 76) A 77) Notice that the student is not asked to solve the problem, but to explain the reasoning. Density can be used as a conversion factor because the definition essentially states that x g of substance is equivalent to y ml of the substance. Therefore, the two conversion factors, desired conversion. x g y ml y ml and, can be written and the appropriate one used to make the x g 13