Question 1

Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm3) . What is the density of talc?

Accepted Answer

A)   4.61 g/cm3
B)   2.82 g/cm3
C)   2.63 g/cm3
D)   2.44 g/cm3
E)   1.61 g/cm3F) All of the above
G) B) and C)

Question 2

Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4°C. What is the boiling point in kelvins?

Accepted Answer

A)   387.6 K
B)   355.6 K
C)   323.6 K
D)   190.8 K
E)   -190.8 KF) A) and C)
G) D) and E)

Question 3

Which of the following activities is not a part of good science?

Accepted Answer

A)   proposing a theory
B)   developing a hypothesis
C)   making quantitative observations
D)   designing experiments
E)   indulging in speculationF) B) and D)
G) A) and E)

Question 4

Classify the following properties of hydrogen gas as either intensive or extensive.
a. the mass of the gas sample
b. the average speed of a molecule in the sample
c. temperature
d. density
e. number of molecules present

Accepted Answer

a. extensive
b. inte...

Question 5

The average distance from Earth to the Sun is 150 megameters. What is that distance in meters?

Accepted Answer

A)   1.5 × 108 m
B)   1.5 × 106 m
C)   1.5 × 105 m
D)   1.5 × 103 m
E)   1.5 × 10-6 mF) A) and B)
G) A) and C)

Question 6

Which measurement is expressed to 4 significant figures?

Accepted Answer

A)   0.423 kg
B)   24.049 cm
C)   1300 K
D)   82,306 m
E)   62.40 gF) A) and D)
G) A) and E)

Question 7

Which of the following represents the largest volume?

Accepted Answer

A)   10,000 μL
B)   1000 pL
C)   100 mL
D)   10 nL
E)   10 cm3F) A) and B)
G) B) and E)

Question 8

When applying the scientific method, a model or theory should be based on experimental data.

Accepted Answer

A) True 
 B)False

Question 9

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 × l05 km
D)   1.5 × 105 km
E)   9.4 × 104 kmF) A) and D)
G) A) and E)

Question 10

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 11

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

Accepted Answer

A)   1.
B)   2.
C)   3.
D)   4.
E)   5.F) None of the above
G) A) and B)

Question 12

Select the best statement about chemistry before 1800.

Accepted Answer

A)   Alchemy focused on objective experimentation rather than mystical explanations of processes.
B)   The phlogiston theory laid a valuable theoretical basis for modern chemistry.
C)   Lavoisier's quantitative work on the role of oxygen in combustion was the beginning of modern chemistry.
D)   The interpretation of data by alchemists was not biased by their overall view of life.
E)   Alchemists failed because they did not develop any practical chemical methods.F) B) and E)
G) A) and C)

Question 13

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 14

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

Question 15

Select the answer with the correct number of decimal places for the following sum: 13.914 cm + 243.1 cm + 12.00460 cm =

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) None of the above

Question 16

When applying the scientific method, it is important to avoid any form of hypothesis.

Accepted Answer

A) True 
 B)False

Question 17

A dictionary has the following definition for a word: "A tentative explanation that accounts for a set of facts." Which of the following words best fits that definition?

Accepted Answer

A)   theory
B)   hypothesis
C)   law
D)   experiment
E)   definitionF) None of the above
G) B) and D)

Question 18

Select the best statement.

Accepted Answer

A)   Physical changes may be reversed by changing the temperature.
B)   Physical changes alter the composition of the substances involved.
C)   Physical properties are not valid characteristics for identifying a substance.
D)   Physical properties are mostly extensive in nature.
E)   Physical changes are usually accompanied by chemical changes.F) C) and D)
G) B) and E)

Question 19

The SI unit of speed (velocity)  is

Accepted Answer

A)   km/h.
B)   km/s.
C)   m/h.
D)   m/s.
E)   None of these choices are correct.F) A) and C)
G) None of the above

Question 20

The most significant contribution to modern science made by alchemists was

Accepted Answer

A)   their fundamental work in the transmutation of the elements.
B)   their widespread acceptance of observation and experimentation.
C)   their systematic method of naming substances.
D)   their understanding of the nature of chemical reactions.
E)   their discovery of phlogiston.F) C) and E)
G) B) and D)

Exam 1: Keys to Studying Chemistry Definitions, Units, and Problem Solving

Select the best statement.

Correct AnswerverifiedShow Answer

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

The average distance from Earth to the Sun is 150 megameters. What is that distance in meters?

Correct AnswerverifiedShow Answer

When applying the scientific method, a model or theory should be based on experimental data.

Correct AnswerverifiedShow Answer

Which of the following activities is not a part of good science?

Correct AnswerverifiedShow Answer

Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4°C. What is the boiling point in kelvins?

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

Classify the following properties of hydrogen gas as either intensive or extensive. a. the mass of the gas sample b. the average speed of a molecule in the sample c. temperature d. density e. number of molecules present

Correct Answerverifieda. extensiveb. inte...View AnswerShow Answer

The SI unit of speed (velocity) is

Correct AnswerverifiedShow Answer

When applying the scientific method, it is important to avoid any form of hypothesis.

Correct AnswerverifiedShow Answer

Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm3) . What is the density of talc?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The most significant contribution to modern science made by alchemists was

Correct AnswerverifiedShow Answer

Select the answer with the correct number of decimal places for the following sum: 13.914 cm + 243.1 cm + 12.00460 cm =

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Select the best statement about chemistry before 1800.

Correct AnswerverifiedShow Answer

Which of the following represents the largest volume?

Correct AnswerverifiedShow Answer

A dictionary has the following definition for a word: "A tentative explanation that accounts for a set of facts." Which of the following words best fits that definition?

Correct AnswerverifiedShow Answer

Which measurement is expressed to 4 significant figures?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a. extensive
b. inte...
View Answer

Correct Answer
verified

Correct Answer
verified

Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm³) . What is the density of talc?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified