Question 1

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 2

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.F) B) and E)
G) All of the above

Question 3

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.F) A) and B)
G) B) and D)

Question 4

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 5

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 uncertaintyF) None of the above
G) C) and D)

Question 6

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

Accepted Answer

A)  5.20302  ×	imes×  104 m
B)  5.20302  ×	imes×  105 m
C)  5.203  ×	imes×  104 m
D)  5.20  ×	imes×  104 m
E)  5.2  ×	imes×  104 m F) A) and E)
G) A) and B)

Question 7

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 8

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 cmF) None of the above
G) B) and C)

Question 9

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°CF) A) and C)
G) B) and D) D

Question 10

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

Accepted Answer

A)  1.34  ×	imes×  10-13 m
B)  1.34  ×	imes×  10-12 m
C)  1.34  ×	imes×  10-10 m
D)  1.34  ×	imes×  10-7 m
E)  1.34  ×	imes×  10-6 m F) A) and D)
G) C) and D) C

Question 11

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 12

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 in3F) A) and E)
G) A) and B)

Question 13

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 14

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.F) A) and D)
G) B) and C)

Question 15

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

Accepted Answer

A hypothesis should be capable...

Question 16

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 cmF) A) and D)
G) A) and E)

Question 17

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

Accepted Answer

A)  6.1  ×	imes×  105 km
B)  5.3  ×	imes×  105 km
C)  3.9  ×	imes×  l05 km
D)  1.5  ×	imes×  105 km
E)  9.4  ×	imes×  104 km F) All of the above
G) C) and D)

Question 18

Express 96,342 m using 2 significant figures.

Accepted Answer

A)  9.60  ×	imes×  104 m
B)  9.6  ×	imes×  104 m
C)  9.60  ×	imes×  10-4 m
D)  9.6  ×	imes×  10-4 m
E)  96,000.m F) B) and D)
G) A) and B)

Question 19

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 20

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.F) A) and E)
G) B) and D)

Exam 1: Keys to the Study of Chemistry

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.

Correct Answer
verified
1 J = 10⁷ erg

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?

Correct Answer
verified

Water vapor is less dense than ice because

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified
Answers could all be the same,...
View Answer

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

Correct Answer
verified

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

Correct Answer
verified
D

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

Correct Answer
verified
C

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

Correct Answer
verified

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

Correct Answer
verified

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.

Correct Answer
verified

Select the best statement.

Correct Answer
verified

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

Correct Answer
verified
A hypothesis should be capable...
View Answer

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

Correct Answer
verified

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

Correct Answer
verified

Express 96,342 m using 2 significant figures.

Correct Answer
verified

Correct Answer
verified
a.10³ (exactly)
b.1.4...
View Answer

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

Correct Answer
verified

Exam 1: Keys to the Study of Chemistry

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.

Correct Answerverified1 J = 107 erg

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?

Correct AnswerverifiedShow Answer

Water vapor is less dense than ice because

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedAnswers could all be the same,...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

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

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

Select the best statement.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA hypothesis should be capable...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Express 96,342 m using 2 significant figures.

Correct AnswerverifiedShow Answer

Correct Answerverifieda.103 (exactly)b.1.4...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct Answer
verified
1 J = 10⁷ erg

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?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Answers could all be the same,...
View Answer

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified
C

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A hypothesis should be capable...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a.10³ (exactly)
b.1.4...
View Answer

Correct Answer
verified