Question 1

The result of (3.8621 × 1.5630) - 5.98 is properly written as

Accepted Answer

A)  0.06. 
B)  0.056. 
C)  0.0565. 
D)  0.05646. 
E)  0.056462. 
A)  0.06. 
B)  0.056. 
C)  0.0565. 
D)  0.05646. 
E)  0.056462.

Question 2

Given that 1 inch = 2.54 cm, 1 cm3 is equal to

Accepted Answer

A)  16.4 in3. 
B)  6.45 in3. 
C)  0.394 in3. 
D)  0.155 in3. 
E)  0.0610 in3. 
A)  16.4 in3. 
B)  6.45 in3. 
C)  0.394 in3. 
D)  0.155 in3. 
E)  0.0610 in3.

Question 3

Which of the following correctly expresses 52,030.2 m in scientific notation?

Accepted Answer

A)  5.20302 × 104 m 
B)  5.20302 × 105 m 
C)  5.203 × 104 m 
D)  5.20 × 104 m 
E)  5.2 × 104 m 
A)  5.20302 × 104 m 
B)  5.20302 × 105 m 
C)  5.203 × 104 m 
D)  5.20 × 104 m 
E)  5.2 × 104 m

Question 4

Express 96,342 m using 2 significant figures.

Accepted Answer

A)  9.60 × 104 m 
B)  9.6 × 104 m 
C)  9.60 × 10-4 m 
D)  9.6 × 10-4 m 
E) 96000. m 
A)  9.60 × 104 m 
B)  9.6 × 104 m 
C)  9.60 × 10-4 m 
D)  9.6 × 10-4 m 
E) 96000. m

Question 5

The area of a 15-inch pizza is 176.7 in2. Express this area in square centimeters.

Accepted Answer

A)  1140. cm2 
B)  448.8 cm2 
C)  96.8 cm2 
D)  69.57 cm2 
E)  27.39 cm2 
A)  1140. cm2 
B)  448.8 cm2 
C)  96.8 cm2 
D)  69.57 cm2 
E)  27.39 cm2

Question 6

The appropriate number of significant figures in the result of 15.234 × 15.208 is

Accepted Answer

A)  2. 
B)  3. 
C)  4. 
D)  5. 
E)  6. 
A)  2. 
B)  3. 
C)  4. 
D)  5. 
E)  6.

Question 7

The average distance between the Earth and the Moon is 240,000 miles. Express this distance in kilometers.

Accepted Answer

A)  6.1 × 105 km 
B)  5.3 × 105 km 
C)  3.9 × 105 km 
D)  1.5 × 105 km 
E)  9.4 × 104 km 
A)  6.1 × 105 km 
B)  5.3 × 105 km 
C)  3.9 × 105 km 
D)  1.5 × 105 km 
E)  9.4 × 104 km

Question 8

The density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm3. What is that density in pounds per cubic inch?

Accepted Answer

A)  849 lb/in3 
B)  491 lb/in3 
C)  376 lb/in3 
D)  0.491 lb/in3 
E)  1.83 × 10-3 lb/in3 
A)  849 lb/in3 
B)  491 lb/in3 
C)  376 lb/in3 
D)  0.491 lb/in3 
E)  1.83 × 10-3 lb/in3

Question 9

An evacuated 276 mL glass bulb weighs 129.6375 g. Filled with an unknown gas, the bulb weighs 130.0318 g. Calculate the gas density in g/L, and express it with an appropriate number of significant figures.

Accepted Answer

The answer of An evacuated 276 mL glass bulb weighs...

Question 10

The number 6.0448, rounded to 3 decimal places, becomes 6.045.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following abbreviations of the given SI base unit is incorrect?

Accepted Answer

A)  second: s 
B)  kilogram: kg 
C)  meter: m 
D)  mole: mol 
E)  kelvin: k 
A)  second: s 
B)  kilogram: kg 
C)  meter: m 
D)  mole: mol 
E)  kelvin: k

Question 12

The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h?

Accepted Answer

A)  65,500 mi/h 
B)  25,300 mi/h 
C)  18,200 mi/h 
D)  1,090 mi/h 
E)  5.02 × 10-3 mi/h 
A)  65,500 mi/h 
B)  25,300 mi/h 
C)  18,200 mi/h 
D)  1,090 mi/h 
E)  5.02 × 10-3 mi/h

Question 13

The mass of a sample is 550 milligrams. Which of the following expresses that mass in kilograms?

Accepted Answer

A)  5.5 × 108 kg 
B)  5.5 × 105 kg 
C)  5.5 × 10-4 kg 
D)  5.5 × 10-6 kg 
E)  5.5 × 10-1 kg 
A)  5.5 × 108 kg 
B)  5.5 × 105 kg 
C)  5.5 × 10-4 kg 
D)  5.5 × 10-6 kg 
E)  5.5 × 10-1 kg

Question 14

As part of an experiment to determine the density of a new plastic developed in her laboratory, Sara Ann Dippity measures the volume of a solid sample. Her four trials yield volumes of 12.37 cm3, 12.41 cm3, 12.39 cm3, and 12.38 cm3. Measurements of other scientists in the lab give an average volume of 12.49 cm3. Which of the following statements represents the best analysis of the data?

Accepted Answer

A)  Sara's results have low precision and high accuracy. 
B)  Sara's results have high precision and high accuracy. 
C)  Sara's results have greater precision than accuracy. 
D)  Sara's results have greater accuracy than precision. 
E)  Sara has been using a faulty instrument to measure the volume. 
A)  Sara's results have low precision and high accuracy. 
B)  Sara's results have high precision and high accuracy. 
C)  Sara's results have greater precision than accuracy. 
D)  Sara's results have greater accuracy than precision. 
E)  Sara has been using a faulty instrument to measure the volume.

Question 15

As chief chemist at Superior Analytical Products (SAP) you must design an experiment to determine the density of an unknown liquid to three (3) significant figures. The density is of the order of 1 g/cm3. You have approximately 7 mL of the liquid and only graduated cylinders and balances are available for your use. Which of the following combinations of equipment will allow you to meet but not exceed your goal?

Accepted Answer

A)  graduated cylinder with ±0.1 mL uncertainty; balance with ±0.1 g uncertainty 
B)  graduated cylinder with ±0.01 mL uncertainty; balance with ±0.1 g uncertainty 
C)  graduated cylinder with ±0.01 mL uncertainty; balance with ±0.01 g uncertainty 
D)  graduated cylinder with ±0.001 mL uncertainty; balance with ±0.001 g uncertainty 
E)  graduated cylinder with ±0.1 mL uncertainty; balance with ±0.001 g uncertainty 
A)  graduated cylinder with ±0.1 mL uncertainty; balance with ±0.1 g uncertainty 
B)  graduated cylinder with ±0.01 mL uncertainty; balance with ±0.1 g uncertainty 
C)  graduated cylinder with ±0.01 mL uncertainty; balance with ±0.01 g uncertainty 
D)  graduated cylinder with ±0.001 mL uncertainty; balance with ±0.001 g uncertainty 
E)  graduated cylinder with ±0.1 mL uncertainty; balance with ±0.001 g uncertainty

Question 16

If the density of a certain spherical atomic nucleus is 1.0 × 1014 g cm-3 and its mass is 2.0 × 10-23 g, what is its radius in cm?

Accepted Answer

A)  3.6 × 10-13 cm 
B)  2.0 × 10-37 cm 
C)  4.8 × 10-38 cm 
D)  2.2 × 10-19 cm 
E)  none of the above 
A)  3.6 × 10-13 cm 
B)  2.0 × 10-37 cm 
C)  4.8 × 10-38 cm 
D)  2.2 × 10-19 cm 
E)  none of the above

Question 17

The SI unit of energy is the joule, J. 1 J = 1 kgF1F1F1S1F1F1F10m2/s2. Another energy unit, the erg, was once in widespread use. 1 erg = 1 gF1F1F1S1F1F1F10cm2/s2. Calculate the number of ergs in 1 J, showing all your work.

Accepted Answer

Question 18

Select the best statement.

Accepted Answer

A)  Chemical changes provide the only valid basis for identification of a substance. 
B)  Chemical changes are easily reversed by altering the temperature of the system. 
C)  Chemical changes always produce substances different from the starting materials. 
D)  Chemical changes are associated primarily with extensive properties. 
E)  Chemical changes are accompanied by changes in the total mass of the substances involved. 
A)  Chemical changes provide the only valid basis for identification of a substance. 
B)  Chemical changes are easily reversed by altering the temperature of the system. 
C)  Chemical changes always produce substances different from the starting materials. 
D)  Chemical changes are associated primarily with extensive properties. 
E)  Chemical changes are accompanied by changes in the total mass of the substances involved.

Question 19

Which of the following correctly shows how to convert a density of 20.1 g cm-3 to units of kg m-3?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 20

Write the following numbers and results in standard notation, with appropriate significant figures.
a. 7.85 × 10-3
b. 7.85 × 104
c. 5.920 × 103
d. 7.85 × 1012 ÷ 1010
e. 7.00 × 10-5
f. circumference of a circle, 2F1F1F1S1F1F1F10r, where r = 8.7 cm
g.

Accepted Answer

a. 0.00785
b. 78500

Exam 1: Keys to the Study of Chemistry

The result of (3.8621 × 1.5630) - 5.98 is properly written as

Given that 1 inch = 2.54 cm, 1 cm3 is equal to

Which of the following correctly expresses 52,030.2 m in scientific notation?

Express 96,342 m using 2 significant figures.

The area of a 15-inch pizza is 176.7 in2. Express this area in square centimeters.

The appropriate number of significant figures in the result of 15.234 × 15.208 is

The average distance between the Earth and the Moon is 240,000 miles. Express this distance in kilometers.

The density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm3. What is that density in pounds per cubic inch?

An evacuated 276 mL glass bulb weighs 129.6375 g. Filled with an unknown gas, the bulb weighs 130.0318 g. Calculate the gas density in g/L, and express it with an appropriate number of significant figures.

The number 6.0448, rounded to 3 decimal places, becomes 6.045.

Which of the following abbreviations of the given SI base unit is incorrect?

The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h?

The mass of a sample is 550 milligrams. Which of the following expresses that mass in kilograms?

If the density of a certain spherical atomic nucleus is 1.0 × 1014 g cm-3 and its mass is 2.0 × 10-23 g, what is its radius in cm?

The SI unit of energy is the joule, J. 1 J = 1 kgm2/s2. Another energy unit, the erg, was once in widespread use. 1 erg = 1 gcm2/s2. Calculate the number of ergs in 1 J, showing all your work.

Select the best statement.

Which of the following correctly shows how to convert a density of 20.1 g cm-3 to units of kg m-3?

Write the following numbers and results in standard notation, with appropriate significant figures. a. 7.85 × 10-3 b. 7.85 × 104 c. 5.920 × 103 d. 7.85 × 1012 ÷ 1010 e. 7.00 × 10-5 f. circumference of a circle, 2r, where r = 8.7 cm g.

The Components of Matter

Stoichiometry of Formulas and Equations

The Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main Group Elements: Bonding, Structure, and Reactivity

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Given that 1 inch = 2.54 cm, 1 cm³ is equal to

The area of a 15-inch pizza is 176.7 in². Express this area in square centimeters.

The density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm³. What is that density in pounds per cubic inch?

The speed needed to escape the pull of Earth^'s gravity is 11.3 km/s. What is this speed in mi/h?

If the density of a certain spherical atomic nucleus is 1.0 × 10¹⁴ g cm^-3 and its mass is 2.0 × 10^-23 g, what is its radius in cm?

The SI unit of energy is the joule, J. 1 J = 1 kgm²/s². Another energy unit, the erg, was once in widespread use. 1 erg = 1 gcm²/s². Calculate the number of ergs in 1 J, showing all your work.

Which of the following correctly shows how to convert a density of 20.1 g cm^-3 to units of kg m^-3?

Write the following numbers and results in standard notation, with appropriate significant figures. a. 7.85 × 10^-3 b. 7.85 × 10⁴ c. 5.920 × 10³ d. 7.85 × 10¹² ÷ 10¹⁰ e. 7.00 × 10^-5 f. circumference of a circle, 2r, where r = 8.7 cm g.