Question 1

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

Question 2

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

Question 3

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 4

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) None of the above
G) A) and B)

Question 5

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) C) and E)
G) B) and E)

Question 6

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/hF) A) and B)
G) A) and C)

Question 7

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. mF) All of the above
G) D) and E)

Question 8

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 9

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 kgF) C) and D)
G) D) and E)

Question 10

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/in3F) B) and C)
G) C) and E)

Question 11

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

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 in3.F) B) and D)
G) A) and E)

Question 13

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 aboveF) A) and B)
G) C) and E)

Question 14

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 kmF) A) and C)
G) B) and C)

Question 15

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
...

Question 16

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) A) and B)
G) A) and D)

Question 17

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: kF) A) and B)
G) B) and E)

Question 18

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 mF) A) and B)
G) B) and E)

Question 19

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 cm2F) A) and B)
G) A) and C)

Question 20

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)   -3 to units of kg m-3? 
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D)     
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B)   -3 to units of kg m-3? 
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C)   -3 to units of kg m-3? 
A)     
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D)     
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D)   -3 to units of kg m-3? 
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E)   -3 to units of kg m-3? 
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E)    " class="answers-bank-image d-inline" rel="preload" >F) None of the above
G) A) and E)

Exam 1: Keys to the Study of Chemistry

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.

Correct Answer
verified

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

Correct Answer
verified

Select the best statement.

Correct Answer
verified

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.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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.

Correct Answer
verified
a. 0.00785
b. 78500
...
View Answer

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

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Express 96,342 m using 2 significant figures.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified

Exam 1: Keys to the Study of Chemistry

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Select the best statement.

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct Answerverifieda. 0.00785b. 78500...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Express 96,342 m using 2 significant figures.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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.

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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.

Correct Answer
verified
a. 0.00785
b. 78500
...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified

Correct Answer
verified