Question 1

Convert the following numbers from scientific notation to ordinary decimal notation.
-9.91 x 105 ____________________

Accepted Answer

991,000

Question 2

Convert the following numbers from scientific notation to ordinary decimal notation.
-3.01 x 10−3 ____________________

Accepted Answer

0.00301

Question 3

For each of the measurements, determine the number of significant figures present. Specify your answers using the choices on the right.
‪

Accepted Answer

‪

Question 4

A pipet is calibrated with the smallest scale markings of 0.1 milliliters. Indicate to what uncertainty readings should be recorded for measurements made with this device.

Accepted Answer

The answer of A pipet is calibrated with the smallest...

Question 5

What mathematical operation is represented by the exponential notation of 10 - 4?

Accepted Answer

A)  10 x 10 x 10 x 10 
B)  10 + 10 + 10 + 10 
C)  1/10 x 1/10 x 1/10 x 1/10 
D)  1/10 + 1/10 + 1/10 + 1/10 
A)  10 x 10 x 10 x 10 
B)  10 + 10 + 10 + 10 
C)  1/10 x 1/10 x 1/10 x 1/10 
D)  1/10 + 1/10 + 1/10 + 1/10

Question 6

Round off each of the following numbers to the number of significant figures indicated in parenthesis.
-652,387 (two) ____________________

Accepted Answer

The answer of Round off each of the following numbers...

Question 7

A lab technician was assigned the task of determining the pH of a sample of blood. The technician performed three replicate measurements of the pH of the sample and reported the following results.
PH = 6.98, pH = 6.99, pH = 6.98
The actual pH of blood is 7.40. In evaluating the technician's job performance in terms of accuracy and precision, it can be said that the technician ________.

Accepted Answer

A)  was neither accurate nor precise 
B)  was both accurate and precise 
C)  was accurate but not precise 
D)  was precise but not accurate 
A)  was neither accurate nor precise 
B)  was both accurate and precise 
C)  was accurate but not precise 
D)  was precise but not accurate

Question 8

Which of the following sources of experimental error would properly be classified as a systematic error?

Accepted Answer

A)  momentary changes in air currents within the instrument room 
B)  accidental miscalibration of the instrument being used 
C)  variances in the angle from which the instrument scale is read 
D)  momentary changes in the temperature of the instrument room 
A)  momentary changes in air currents within the instrument room 
B)  accidental miscalibration of the instrument being used 
C)  variances in the angle from which the instrument scale is read 
D)  momentary changes in the temperature of the instrument room

Question 9

Express the following numbers in scientific notation.
-6,970,000 ____________________

Accepted Answer

The answer of Express the following numbers in scientific notation.
-6,970,000...

Question 10

Express the following numbers in scientific notation.
-0.0000653 ____________________

Accepted Answer

The answer of Express the following numbers in scientific notation.
-0.0000653...

Question 11

Which of the following statements is true?

Accepted Answer

A)  Numbers that contain three significant figures are 1, 3, and 6. 
B)  Numbers in which all zeros are significant are 2, 3, 4, and 5. 
C)  Numbers in which none of the zeros are significant are 1 and 2. 
D)  Number with one significant figure is 6. 
A)  Numbers that contain three significant figures are 1, 3, and 6. 
B)  Numbers in which all zeros are significant are 2, 3, 4, and 5. 
C)  Numbers in which none of the zeros are significant are 1 and 2. 
D)  Number with one significant figure is 6.

Question 12

The correct answer obtained from subtracting 1.2 from 123.96 contains ________.

Accepted Answer

A)  2 significant figures 
B)  3 significant figures 
C)  4 significant figures 
D)  5 significant figures 
A)  2 significant figures 
B)  3 significant figures 
C)  4 significant figures 
D)  5 significant figures

Question 13

Perform the following mathematical operations and express the answers to the correct number of significant figures.
-74.632 + 23 − 1.01 = ____________________

Accepted Answer

The answer of Perform the following mathematical operations and express...

Question 14

Round off each of the following numbers to 3 significant figures.
-397.48 ____________________

Accepted Answer

The answer of Round off each of the following numbers...

Question 15

The number 80710, when rounded off to 2 significant figures, would appear as ________.

Accepted Answer

A)  80700 
B)  81000 
C)  8100 
D)  8070 
A)  80700 
B)  81000 
C)  8100 
D)  8070

Question 16

Perform the following mathematical operations and express the answers to the correct number of significant figures.
-[(2.1 x 10-4/6.89 x 10-3)] - (1.59 x 10-2) = ____________________

Accepted Answer

Question 17

Perform the indicated mathematical operations and express the answer in scientific notation rounded off to the proper number of significant figures.
[2.098 x 1014 /74.5 x 10-6] (1.0900 x 104)

Accepted Answer

A)  3.07 x 1022 
B)  3.0696 x 10-23 
C)  3.1 x 1023 
D)  3.07 x 1023 
A)  3.07 x 1022 
B)  3.0696 x 10-23 
C)  3.1 x 1023 
D)  3.07 x 1023

Question 18

Perform the following addition and express the answer to the correct number of significant figures.
12.47 g + 1.026 g + 135.8 g

Accepted Answer

A)  149.296 
B)  150. 
C)  149.3 
D)  149.30 
A)  149.296 
B)  150. 
C)  149.3 
D)  149.30

Question 19

The correct answer for the calculation

Where 126 and 135 are counted numbers and 1.364 and 0.8951 are measured numbers is ________.

Accepted Answer

A)  1.422 
B)  1.4 
C)  1.42 
D)  1.4220 
A)  1.422 
B)  1.4 
C)  1.42 
D)  1.4220

Question 20

Round off each of the following numbers to 3 significant figures.
-145,120 ____________________

Accepted Answer

The answer of Round off each of the following numbers...

Convert the following numbers from scientific notation to ordinary decimal notation. -9.91 x 10⁵ ____________________

Convert the following numbers from scientific notation to ordinary decimal notation. -3.01 x 10⁻³ ____________________

For each of the measurements, determine the number of significant figures present. Specify your answers using the choices on the right. ‪

A pipet is calibrated with the smallest scale markings of 0.1 milliliters. Indicate to what uncertainty readings should be recorded for measurements made with this device.

What mathematical operation is represented by the exponential notation of 10 - ⁴?

Round off each of the following numbers to the number of significant figures indicated in parenthesis. -652,387 (two) ____________________

Which of the following sources of experimental error would properly be classified as a systematic error?

Express the following numbers in scientific notation. -6,970,000 ____________________

Express the following numbers in scientific notation. -0.0000653 ____________________

Which of the following statements is true?

The correct answer obtained from subtracting 1.2 from 123.96 contains ________.

Perform the following mathematical operations and express the answers to the correct number of significant figures. -74.632 + 23 − 1.01 = ____________________

Round off each of the following numbers to 3 significant figures. -397.48 ____________________

The number 80710, when rounded off to 2 significant figures, would appear as ________.

Perform the following mathematical operations and express the answers to the correct number of significant figures. -[(2.1 x 10^-4/6.89 x 10^-3)] - (1.59 x 10^-2) = ____________________

Perform the indicated mathematical operations and express the answer in scientific notation rounded off to the proper number of significant figures. [2.098 x 10¹⁴ /74.5 x 10^-6] (1.0900 x 10⁴)

Perform the following addition and express the answer to the correct number of significant figures. 12.47 g + 1.026 g + 135.8 g

The correct answer for the calculation Where 126 and 135 are counted numbers and 1.364 and 0.8951 are measured numbers is ________.

Round off each of the following numbers to 3 significant figures. -145,120 ____________________

The Science of Chemistry

Unit Systems and Dimensional Analysis

Basic Concepts About Matter

Atoms, Molecules, Formulas, and Subatomic Particles

Electronic Structure and Chemical Periodicity

Chemical Bonds

Chemical Nomenclature

Chemical Calculations: the Mole Concept and Chemical Formulas

Chemical Calculations Involving Chemical Equations

States of Matter

Gas Laws

Solutions

Acids, Bases and Salts

Oxidation and Reduction

Reaction Rates and Chemical Equilibrium

Nuclear Chemistry

Filters

Exam 2: Numbers From Measurements

Convert the following numbers from scientific notation to ordinary decimal notation. -9.91 x 105 ____________________

Convert the following numbers from scientific notation to ordinary decimal notation. -3.01 x 10−3 ____________________

For each of the measurements, determine the number of significant figures present. Specify your answers using the choices on the right. ‪

A pipet is calibrated with the smallest scale markings of 0.1 milliliters. Indicate to what uncertainty readings should be recorded for measurements made with this device.

What mathematical operation is represented by the exponential notation of 10 - 4?

Round off each of the following numbers to the number of significant figures indicated in parenthesis. -652,387 (two) ____________________

Which of the following sources of experimental error would properly be classified as a systematic error?

Express the following numbers in scientific notation. -6,970,000 ____________________

Express the following numbers in scientific notation. -0.0000653 ____________________

Which of the following statements is true?

The correct answer obtained from subtracting 1.2 from 123.96 contains ________.

Perform the following mathematical operations and express the answers to the correct number of significant figures. -74.632 + 23 − 1.01 = ____________________

Round off each of the following numbers to 3 significant figures. -397.48 ____________________

The number 80710, when rounded off to 2 significant figures, would appear as ________.

Perform the following mathematical operations and express the answers to the correct number of significant figures. -[(2.1 x 10-4/6.89 x 10-3)] - (1.59 x 10-2) = ____________________

Perform the indicated mathematical operations and express the answer in scientific notation rounded off to the proper number of significant figures. [2.098 x 1014 /74.5 x 10-6] (1.0900 x 104)

Perform the following addition and express the answer to the correct number of significant figures. 12.47 g + 1.026 g + 135.8 g

The correct answer for the calculation Where 126 and 135 are counted numbers and 1.364 and 0.8951 are measured numbers is ________.

Round off each of the following numbers to 3 significant figures. -145,120 ____________________

The Science of Chemistry

Unit Systems and Dimensional Analysis

Basic Concepts About Matter

Atoms, Molecules, Formulas, and Subatomic Particles

Electronic Structure and Chemical Periodicity

Chemical Bonds

Chemical Nomenclature

Chemical Calculations: the Mole Concept and Chemical Formulas

Chemical Calculations Involving Chemical Equations

States of Matter

Gas Laws

Solutions

Acids, Bases and Salts

Oxidation and Reduction

Reaction Rates and Chemical Equilibrium

Nuclear Chemistry

Filters

Convert the following numbers from scientific notation to ordinary decimal notation. -9.91 x 10⁵ ____________________

Convert the following numbers from scientific notation to ordinary decimal notation. -3.01 x 10⁻³ ____________________

What mathematical operation is represented by the exponential notation of 10 - ⁴?

Perform the following mathematical operations and express the answers to the correct number of significant figures. -[(2.1 x 10^-4/6.89 x 10^-3)] - (1.59 x 10^-2) = ____________________

Perform the indicated mathematical operations and express the answer in scientific notation rounded off to the proper number of significant figures. [2.098 x 10¹⁴ /74.5 x 10^-6] (1.0900 x 10⁴)