Question 1

The distance between carbon atoms in ethylene is 134 picometers.Which of the following expresses that distance in meters?

Accepted Answer

A) 1.34 $\times$ 10-13 m 
B) 1.34 $\times$ 10-12 m 
C) 1.34 $\times$ 10-10 m 
D) 1.34 $\times$ 10-7 m 
E) 1.34 $\times$ 10-6 m 
A) 1.34 $\times$ 10-13 m 
B) 1.34 $\times$ 10-12 m 
C) 1.34 $\times$ 10-10 m 
D) 1.34 $\times$ 10-7 m 
E) 1.34 $\times$ 10-6 m C

Question 2

The S.I.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.

Accepted Answer

1 J = 10⁷ erg

Question 3

Acetic acid boils at 244.2°F.What is its boiling point in degrees Celsius?

Accepted Answer

A) 382.0°C 
B) 167.7°C 
C) 153.4°C 
D) 117.9°C 
E) 103.7°C 
A) 382.0°C 
B) 167.7°C 
C) 153.4°C 
D) 117.9°C 
E) 103.7°C D

Question 4

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 5

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

Accepted Answer

A) 5.20302 $\times$ 104 m 
B) 5.20302 $\times$ 105 m 
C) 5.203 $\times$ 104 m 
D) 5.20 $\times$ 104 m 
E) 5.2 $\times$ 104 m 
A) 5.20302 $\times$ 104 m 
B) 5.20302 $\times$ 105 m 
C) 5.203 $\times$ 104 m 
D) 5.20 $\times$ 104 m 
E) 5.2 $\times$ 104 m

Question 6

Bud N.Chemist must determine the density of a mineral sample.His four trials yield densities of 4.77 g/cm3,4.67 g/cm3,4.69 g/cm3,and 4.81 g/cm3.Independent studies found the correct density to be 4.75 g/cm3.Which of the following statements represents the best analysis of the data?

Accepted Answer

A) Bud's results have much greater accuracy than precision. 
B) Bud's results have much greater precision than accuracy. 
C) Bud's results have high accuracy and high precision. 
D) Bud's results have low accuracy and low precision. 
E) Bud's equipment is faulty. 
A) Bud's results have much greater accuracy than precision. 
B) Bud's results have much greater precision than accuracy. 
C) Bud's results have high accuracy and high precision. 
D) Bud's results have low accuracy and low precision. 
E) Bud's equipment is faulty.

Question 7

During the swing of a frictionless pendulum,what energy form(s)remain constant?

Accepted Answer

A) kinetic energy only 
B) potential energy only 
C) both kinetic energy and potential energy 
D) kinetic plus potential energy 
E) None of these forms remains constant. 
A) kinetic energy only 
B) potential energy only 
C) both kinetic energy and potential energy 
D) kinetic plus potential energy 
E) None of these forms remains constant.

Question 8

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 9

The numerical value of any temperature expressed in Celsius is always different from the numerical value of the same temperature in Fahrenheit.

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

A) 6.1 $\times$ 105 km 
B) 5.3 $\times$ 105 km 
C) 3.9 $\times$ l05 km 
D) 1.5 $\times$ 105 km 
E) 9.4 $\times$ 104 km 
A) 6.1 $\times$ 105 km 
B) 5.3 $\times$ 105 km 
C) 3.9 $\times$ l05 km 
D) 1.5 $\times$ 105 km 
E) 9.4 $\times$ 104 km

Question 11

Briefly explain the relationship between hypothesis and experiment in the scientific method.

Accepted Answer

A hypothesis should be capable

Question 12

The numerical value of any temperature expressed in Celsius is always different from the numerical value of the same temperature in kelvin.

Accepted Answer

A) True 
 B)False

Question 13

A large pizza has a diameter of 15 inches.Express this diameter in centimeters.

Accepted Answer

A) 38 cm 
B) 24 cm 
C) 18 cm 
D) 9.3 cm 
E) 5.9 cm 
A) 38 cm 
B) 24 cm 
C) 18 cm 
D) 9.3 cm 
E) 5.9 cm

Question 14

Water vapor is less dense than ice because

Accepted Answer

A) molecules in the gas phase are in constant motion. 
B) molecules in the gas phase have more potential energy than in solids. 
C) molecules in the gas phase have more kinetic energy than in solids. 
D) gaseous molecules have less mass. 
E) molecules in the gas phase have more space between them than in solids. 
A) molecules in the gas phase are in constant motion. 
B) molecules in the gas phase have more potential energy than in solids. 
C) molecules in the gas phase have more kinetic energy than in solids. 
D) gaseous molecules have less mass. 
E) molecules in the gas phase have more space between them than in solids.

Question 15

Calculate (to three significant figures)the numerical part of the conversion factors needed to carry out the following unit conversions:
a.density in g/cm3 to kg/m3
 b.speed in mi/h to ft/s
c.area in km2 to mi2
 d.area in km2 to cm2
 e.mass/area of aluminum foil in mg/cm2 to g/m2
 f.number of gas molecules per unit volume from /m3 to /ft3
 g.number of bacteria per unit area on a microscope slide from /mm2 to /in2

Accepted Answer

a.10³ (exactly) b.1.4

Question 16

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 17

Give an example of a physical property and a chemical property of each of the following:
a.oxygen gas
b.octane
c.copper

Accepted Answer

Answers could all be the same,

Question 18

The weight of a coin measured as 1.96235 g on one balance is definitely more accurate than a weight measurement of 1.95 g on another balance.

Accepted Answer

A) True 
 B)False

Question 19

Select the answer with the correct number of decimal places for the following sum:

Accepted Answer

A) 269.01860 cm 
B) 269.0186 cm 
C) 269.019 cm 
D) 269.02 cm 
E) 269.0 cm 
A) 269.01860 cm 
B) 269.0186 cm 
C) 269.019 cm 
D) 269.02 cm 
E) 269.0 cm

Question 20

Express 96,342 m using 2 significant figures.

Accepted Answer

A) 9.60 $\times$ 104 m 
B) 9.6 $\times$ 104 m 
C) 9.60 $\times$ 10-4 m 
D) 9.6 $\times$ 10-4 m 
E) 96,000.m 
A) 9.60 $\times$ 104 m 
B) 9.6 $\times$ 104 m 
C) 9.60 $\times$ 10-4 m 
D) 9.6 $\times$ 10-4 m 
E) 96,000.m

Exam 1: Keys to the Study of Chemistry

The distance between carbon atoms in ethylene is 134 picometers.Which of the following expresses that distance in meters?

The S.I.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.

Acetic acid boils at 244.2°F.What is its boiling point in degrees Celsius?

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

Bud N.Chemist must determine the density of a mineral sample.His four trials yield densities of 4.77 g/cm3,4.67 g/cm3,4.69 g/cm3,and 4.81 g/cm3.Independent studies found the correct density to be 4.75 g/cm3.Which of the following statements represents the best analysis of the data?

During the swing of a frictionless pendulum,what energy form(s)remain constant?

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

The numerical value of any temperature expressed in Celsius is always different from the numerical value of the same temperature in Fahrenheit.

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

Briefly explain the relationship between hypothesis and experiment in the scientific method.

The numerical value of any temperature expressed in Celsius is always different from the numerical value of the same temperature in kelvin.

A large pizza has a diameter of 15 inches.Express this diameter in centimeters.

Water vapor is less dense than ice because

Select the best statement.

Give an example of a physical property and a chemical property of each of the following: a.oxygen gas b.octane c.copper

The weight of a coin measured as 1.96235 g on one balance is definitely more accurate than a weight measurement of 1.95 g on another balance.

Select the answer with the correct number of decimal places for the following sum:

Express 96,342 m using 2 significant figures.

The Components of Matter

Stoichiometry of Formulas and Equations

Three 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 Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

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 Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

The S.I.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.

Bud N.Chemist must determine the density of a mineral sample.His four trials yield densities of 4.77 g/cm³,4.67 g/cm³,4.69 g/cm³,and 4.81 g/cm³.Independent studies found the correct density to be 4.75 g/cm³.Which of the following statements represents the best analysis of the data?

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