syedibrahim (as78977) – CH2 DIMENSIONAL ANALYSIS – cambre – (PAPCHEM2015C) 1

This print-out should have 33 questions.Multiple-choice questions may continue onthe next column or page – find all choicesbefore answering.

001 10.0 points

A typical silicon chip such as those in digitalwatches and calculators weighs approximately2.3× 10−4 g. How many chips could be madefrom 1.0 kg of silicon?

1. 2.15× 106 chips

2. 1.08× 106 chips

3. 8.6× 106 chips

4. 4.3× 106 chips

002 10.0 points

What is 45,500,000,000 in scientific notation?

1. 4.55× 1010

2. 455.× 107

3. 455.× 10−7

4. 4.55× 10−10

003 10.0 points

What is 0.00875 in scientific notation?

1. 8.75× 103

2. 8.75× 10−3

3. 8.8× 10−3

4. 0.0875× 101

004 10.0 points

Keeping in mind the rules for significant dig-its, find 0.00147 × 8.314 × 7.100.

1. 8.68× 10−2

2. 8.677× 10−2

3. 8.7× 102

4. 0.087

005 10.0 points

Round 0.046171 to three significant figures.

1. 0.0462

2. 4.615× 10−2

3. 0.0461

4. 0.046

006 10.0 points

Express 4592.3 to two (2) significant figures.

1. 4.59× 102

2. 4.5× 103

3. 4.592× 103

4. 4.6× 103

007 10.0 points

Express 1.09 kcal in J.

1. 4560. J

2. 1090 J

3. 4.56 J

4. 4560 J

008 10.0 points

The area of a square with 50 cm sides is

1. 2.5× 104 mm2.

2. 2.5× 10−1 m2.

3. 2.5× 102 cm2.

4. 2.5 m2.

009 10.0 points

syedibrahim (as78977) – CH2 DIMENSIONAL ANALYSIS – cambre – (PAPCHEM2015C) 2

How many calories is 130. joules? (1 calorie= 4.18 joules)

1. 543 cal

2. 3.11 cal

3. 31.1 cal

4. 54.3 cal

010 10.0 points

What is the zero point on the absolute scaledefined as?

1. the equivalent to 0◦F

2. the temperature at which water freezesand ice melts

3. the temperature at which water boils

4. the temperature at which molecular mo-tion ceases

5. the equivalent to 0◦C

011 10.0 points

On the Kelvin scale, a temperature of 43◦C is

1. 273 K.

2. 43 K.

3. 316 K.

4. 230 K.

012 10.0 points

How many grams are there in 720 µg?Answer in units of g.

013 10.0 points

Calculate the number of mL in 0.522 L.Answer in units of mL.

014 10.0 points

What is the density of a block of marble thatoccupies 319 cm3 and has a mass of 855 g?

Answer in units of g/cm3.

015 10.0 points

What is the density of a sample of ore thathas a mass of 90 g and occupies 25.4 cm3?Answer in units of g/cm3.

016 10.0 points

Find the volume of a sample of wood that hasa mass of 84 g and a density of 0.857 g/cm3.Answer in units of cm3.

017 10.0 points

Calculate the mass of a sample of gold thatoccupies 0.878 cm3. The density of gold is19.3 g/cm3.Answer in units of g.

018 10.0 points

What is the sum of 3.272 g and 0.5628 g?

1. 3.8348 g

2. 3.8 g

3. 3.83 g

4. 4 g

5. 3.835 g

6. 3.83480 g

019 10.0 points

What is the density of a piece of metal thathas a mass of 6.29 × 105 g and is 96.4 cm ×

49.1 cm× 81.7 cm?Answer in units of g/cm3.

020 10.0 points

How many kilometers are there in 4.1 ×

107cm?Answer in units of km.

021 10.0 points

Assume that all chickens have 1991 feathers.If it takes you 9.1 seconds to pluck77.6 feathers, how many hours would it takeyou to defeather 1351 chickens?

syedibrahim (as78977) – CH2 DIMENSIONAL ANALYSIS – cambre – (PAPCHEM2015C) 3

Answer in units of hours.

022 10.0 points

A metal cube having a mass of 72.5 g isdropped into a graduated cylinder that con-tains 29.6 mL of water. This causes the waterlevel to rise to 46.8 mL. What is the densityof the metal?Answer in units of g/mL.

023 10.0 points

What is the number 0.00677 in scientific no-tation?

1. 6.77× 10−2

2. 6.77× 103

3. 677× 103

4. 677× 10−3

5. 6.77× 104

6. 6.77× 10−3

7. 6.77× 10−4

024 10.0 points

Given the graph

51

50

B A

Number

of

satisfied

customers

which of the following statements is true?

1. Company B has twice the number of sat-isfied customers as Company A.

2. Company B has 2% more satisfied cus-

tomers than Company A.

3. Company A has twice the number of sat-isfied customers as Company B.

4. More than one answer is true.

5. Company A has 2% more satisfied cus-tomers than Company B.

025 10.0 points

A solid has a mass of 90 grams. A graduatedcylinder contains 25 mL of water. When thesolid is completely submerged in the water,the new water level reads 42 mL.What is the density of the solid?

1. 2.1 g/mL

2. 1.3 g/mL

3. 0.19 g/mL

4. 3.6 g/mL

5. 5.3 g/mL

6. 530 g/mL

026 10.0 points

How many kg are in 10.0 mg?

1. 1.00× 10−4 kg

2. 1.00× 10−6 kg

3. 1.00× 10−5 kg

4. 1.00× 10−7 kg

5. 1.00× 10−3 kg

027 10.0 points

How many mg are in 1.0 kg?

1. 1.0× 106

2. 1.0× 109

syedibrahim (as78977) – CH2 DIMENSIONAL ANALYSIS – cambre – (PAPCHEM2015C) 4

3. 1.0× 10−9

4. 1.0× 10−3

5. 1.0× 103

6. 1.0× 10−6

028 10.0 points

0.0367 seconds is equal to how many millisec-onds?

1. 3.67× 10−5 msec

2. 36.7 msec

3. 3.67× 10−6 msec

4. 3.67 msec

5. 0.0367 msec

029 10.0 points

Convert 6.65× 10−1 to decimal form

1. 0.665

2. 0.0665

3. 66.5

4. 6.65

030 10.0 points

Write 0.044 in scientific notation.

1. 4.4× 102

2. None of these

3. 44× 10−3

4. 0.44× 10−1

5. 44× 103

6. 4.4× 10−2

7. 0.44× 101

031 10.0 points

What is −40◦C in K?

1. 298 K

2. 44 K

3. 25 K

4. 789 K

5. 233 K

032 10.0 points

Heat capacity is a measure of the heat re-quired to

1. change the temperature of a substance.

2. freeze a substance.

3. expand the volume of a substance.

4. evaporate a substance.

033 10.0 points

At room temperature a beaker of liquid mea-sures 26◦C.What is its temperature measuredin Kelvin?

1. 26◦C since they are both the same scale.

2. −247 K

3. None of these

4. 299 K since they are the same scale, butoffset by 273◦.

5. It is not possible to convert from ◦C toK.