Question 1

A student weighed 30.00 μg of sulfur in the lab. This is the same mass as

Accepted Answer

A) 3.000 × 10-8 g. 
B) 3.000 × 10-5 kg. 
C) 3.000 × 10-5 mg. 
D) 3.000 × 104 ng. 
A) 3.000 × 10-8 g. 
B) 3.000 × 10-5 kg. 
C) 3.000 × 10-5 mg. 
D) 3.000 × 104 ng.

Question 2

Read the length of the metal bar with the correct number of significant figures.

Accepted Answer

A) 20 cm 
B) 15 cm 
C) 15.0 cm 
D) 15.00 cm 
E) 15.000 cm 
A) 20 cm 
B) 15 cm 
C) 15.0 cm 
D) 15.00 cm 
E) 15.000 cm

Question 3

What answer should be reported, with the correct number of significant figures, for the following calculation? (965.43 × 3.911)+ 9413.4136

Accepted Answer

A) 13189 
B) 13189.2 
C) 1.32 × 104 
D) 1.3 × 104 
E) 1.319 × 104 
A) 13189 
B) 13189.2 
C) 1.32 × 104 
D) 1.3 × 104 
E) 1.319 × 104

Question 4

Round the following number to four significant figures and express the result in standard exponential notation: 229.613

Accepted Answer

A) 0.2296 × 103 
B) 229.6 
C) 2.296 × 10-2 
D) 2.296 × 102 
E) 22.96 × 10-1 
A) 0.2296 × 103 
B) 229.6 
C) 2.296 × 10-2 
D) 2.296 × 102 
E) 22.96 × 10-1

Question 5

Crude oil is an example of

Accepted Answer

A) a compound. 
B) an element. 
C) a heterogeneous mixture. 
D) a homogeneous mixture. 
A) a compound. 
B) an element. 
C) a heterogeneous mixture. 
D) a homogeneous mixture.

Question 6

Decanting is

Accepted Answer

A) a process in which the more volatile liquid is boiled off. 
B) dissolving a solid into a liquid. 
C) separating a solid from a liquid by pouring off the liquid. 
D) pouring a mixture through a filter paper to separate the solid from the liquid. 
E) heating a mixture of two solids to fuse them together. 
A) a process in which the more volatile liquid is boiled off. 
B) dissolving a solid into a liquid. 
C) separating a solid from a liquid by pouring off the liquid. 
D) pouring a mixture through a filter paper to separate the solid from the liquid. 
E) heating a mixture of two solids to fuse them together.

Question 7

Determine the volume of an object that has a mass of 455.6 g and a density of 19.3 g cm-1.

Accepted Answer

A) 87.9 mL 
B) 42 .4 mL 
C) 18.5 mL 
D) 23.6 mL 
E) 31.2 mL 
A) 87.9 mL 
B) 42 .4 mL 
C) 18.5 mL 
D) 23.6 mL 
E) 31.2 mL

Question 8

How many litres of wine can be held in a wine barrel whose capacity is 26.0 gal? 
1 gal= (1 gal = 4 qt = 3.7854L)

Accepted Answer

A) 1.46 ×   
B) 0.146 
C) 98.4 
D) 6.87 ×   
E) 6.87 
A) 1.46 ×   
B) 0.146 
C) 98.4 
D) 6.87 ×   
E) 6.87

Question 9

The estimated costs for remodelling the interior of an apartment are three 1-gallon cans of paint at $13.22 each, two paint brushes at $9.53 each, and $135 for a helper. The total estimated cost with the appropriate significant figures is $ ______

Accepted Answer

A) 193.72 
B) 1.9 ×   
C) 194 
D) 2 ×   
E) 193.7 
A) 193.72 
B) 1.9 ×   
C) 194 
D) 2 ×   
E) 193.7

Question 10

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)

Accepted Answer

A) 47 gallons 
B) 21 gallons 
C) 7.1 gallons 
D) 24 gallons 
E) 2.3 gallons 
A) 47 gallons 
B) 21 gallons 
C) 7.1 gallons 
D) 24 gallons 
E) 2.3 gallons

Question 11

If the speed limit on a highway is 100 km h-1, what is the speed limit in m h-1?

Accepted Answer

A) 1 × 107 m h-1 
B) 0.1 m h-1 
C) 1 × 103 m h-1 
D) 1 × 105 m h-1 
E) 1 × 101 m h-1 
A) 1 × 107 m h-1 
B) 0.1 m h-1 
C) 1 × 103 m h-1 
D) 1 × 105 m h-1 
E) 1 × 101 m h-1

Question 12

Gasoline is an example of

Accepted Answer

A) a compound. 
B) an element. 
C) a heterogeneous mixture. 
D) a homogeneous mixture. 
A) a compound. 
B) an element. 
C) a heterogeneous mixture. 
D) a homogeneous mixture.

Question 13

Which of the following is an example of physical change?

Accepted Answer

A) Sugar is dissolved in water. 
B) Tea is brewed. 
C) Dry ice sublimes. 
D) Ice (solid water)melts. 
E) All of the above are examples of physical change. 
A) Sugar is dissolved in water. 
B) Tea is brewed. 
C) Dry ice sublimes. 
D) Ice (solid water)melts. 
E) All of the above are examples of physical change.

Question 14

How many kL does a 1.25 × 108 cL sample contain?

Accepted Answer

A) 1.25 × 103 kL 
B) 1.25 × 1013 kL 
C) 1.25 × 104 kL 
D) 1.25 × 1012 kL 
E) 1.25 × 102 kL 
A) 1.25 × 103 kL 
B) 1.25 × 1013 kL 
C) 1.25 × 104 kL 
D) 1.25 × 1012 kL 
E) 1.25 × 102 kL

Question 15

If 1.4% of the mass of a human body is calcium, how many kilograms of calcium are there in a 185-pound man?

Accepted Answer

A) 1.2 kg Ca 
B) 5.7 kg Ca 
C) 1.2 × 102 kg Ca 
D) 5.7 × 102 kg 
A) 1.2 kg Ca 
B) 5.7 kg Ca 
C) 1.2 × 102 kg Ca 
D) 5.7 × 102 kg

Question 16

If a room requires 25.4 square yards of carpeting, what is the area of the floor in units of ft2? (3 ft = 1 yd)

Accepted Answer

A) 76.2 ft2 
B) 8.47 ft2 
C) 282 ft2 
D) 229 ft2 
E) 68.6 ft2 
A) 76.2 ft2 
B) 8.47 ft2 
C) 282 ft2 
D) 229 ft2 
E) 68.6 ft2

Question 17

Round off 00907506 to four significant figures.

Accepted Answer

A) 0091 
B) 9076 
C) 9100 
D) 9.075 × 105 
A) 0091 
B) 9076 
C) 9100 
D) 9.075 × 105

Question 18

Choose the pure substance from the list below.

Accepted Answer

A) tea 
B) a casserole 
C) carbon monoxide 
D) sugar water 
E) pomegranate juice 
A) tea 
B) a casserole 
C) carbon monoxide 
D) sugar water 
E) pomegranate juice

Question 19

Molecules can be described as

Accepted Answer

A) mixtures of two or more pure substances. 
B) mixtures of two or more elements that have a specific ratio between components. 
C) two or more atoms chemically joined together. 
D) heterogeneous mixtures. 
E) homogeneous mixtures. 
A) mixtures of two or more pure substances. 
B) mixtures of two or more elements that have a specific ratio between components. 
C) two or more atoms chemically joined together. 
D) heterogeneous mixtures. 
E) homogeneous mixtures.

Question 20

A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.11 g mL-1, 1.81 g mL-1, 1.95 g mL-1, 1.75 g mL-1. If the actual value for the density of the sugar solution is 1.75 g mL-1, which statement below best describes her results?

Accepted Answer

A) Her results are precise, but not accurate. 
B) Her results are accurate, but not precise. 
C) Her results are both precise and accurate 
D) Her results are neither precise nor accurate. 
E) It isn't possible to determine from the information given. 
A) Her results are precise, but not accurate. 
B) Her results are accurate, but not precise. 
C) Her results are both precise and accurate 
D) Her results are neither precise nor accurate. 
E) It isn't possible to determine from the information given.

Exam 1: Units of Measurement for Physical and Chemical Change

A student weighed 30.00 μg of sulfur in the lab. This is the same mass as

Read the length of the metal bar with the correct number of significant figures.

What answer should be reported, with the correct number of significant figures, for the following calculation? (965.43 × 3.911)+ 9413.4136

Round the following number to four significant figures and express the result in standard exponential notation: 229.613

Crude oil is an example of

Decanting is

Determine the volume of an object that has a mass of 455.6 g and a density of 19.3 g cm-1.

How many litres of wine can be held in a wine barrel whose capacity is 26.0 gal? 1 gal= (1 gal = 4 qt = 3.7854L)

The estimated costs for remodelling the interior of an apartment are three 1-gallon cans of paint at $13.22 each, two paint brushes at $9.53 each, and $135 for a helper. The total estimated cost with the appropriate significant figures is $ ______

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)

If the speed limit on a highway is 100 km h-1, what is the speed limit in m h-1?

Gasoline is an example of

Which of the following is an example of physical change?

How many kL does a 1.25 × 108 cL sample contain?

If 1.4% of the mass of a human body is calcium, how many kilograms of calcium are there in a 185-pound man?

If a room requires 25.4 square yards of carpeting, what is the area of the floor in units of ft2? (3 ft = 1 yd)

Round off 00907506 to four significant figures.

Choose the pure substance from the list below.

Molecules can be described as

A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.11 g mL-1, 1.81 g mL-1, 1.95 g mL-1, 1.75 g mL-1. If the actual value for the density of the sugar solution is 1.75 g mL-1, which statement below best describes her results?

Atoms and Elements

Molecules, Compounds, and Nomenclature

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding Ii: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallury

Transition Metals and Coordination Compounds

Filters

Determine the volume of an object that has a mass of 455.6 g and a density of 19.3 g cm^-1.

If the speed limit on a highway is 100 km h^-1, what is the speed limit in m h^-1?

How many kL does a 1.25 × 10⁸ cL sample contain?

If a room requires 25.4 square yards of carpeting, what is the area of the floor in units of ft²? (3 ft = 1 yd)

A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.11 g mL^-1, 1.81 g mL^-1, 1.95 g mL^-1, 1.75 g mL^-1. If the actual value for the density of the sugar solution is 1.75 g mL^-1, which statement below best describes her results?