Question 1

How many numbers will be in the coefficient when 0.0090110 is expressed in scientific notation?

Accepted Answer

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

Question 2

Do the following additions or subtractions, expressing your answers to the proper number of significant figures.
-(6.3 x 107) + (4.5 x 103) ____________________

Accepted Answer

Question 3

Perform the following mathematical operations and express the answers to the correct number of significant figures.
-(235.8 + 15940 + 6.17) ÷ 1.987 = ____________________

Accepted Answer

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

Question 4

A balance has an accuracy of ±0.01 grams. A beaker weighed 15 grams when weighed on this balance. Using the correct number of significant figures, the weight of the beaker should be recorded as ________.

Accepted Answer

A)  15.000 g 
B)  15 g 
C)  15.0 g 
D)  15.00 g 
A)  15.000 g 
B)  15 g 
C)  15.0 g 
D)  15.00 g

Question 5

Round off each of the following numbers to 3 significant figures.
-0.00860 ____________________

Accepted Answer

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

Question 6

Round off each of the following numbers to the number of significant figures indicated in parenthesis.
-431.50 (three) ____________________

Accepted Answer

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

Question 7

Express the following numbers in scientific notation.
-623,000,000 ____________________

Accepted Answer

The answer of Express the following numbers in scientific notation.
-623,000,000...

Question 8

What is the correct exponential term for the following mathematical operation?

Accepted Answer

A)  10-6 
B)  102 
C)  10-2 
D)  10-4 
A)  10-6 
B)  102 
C)  10-2 
D)  10-4

Question 9

For each of the calculator-completed calculations on the left, determine the correct number of significant figures that the answer should have. Give your response using the choices on the right.
‪

Accepted Answer

The answer of For each of the calculator-completed calculations on...

Question 10

Do the following calculation and express the answer using the correct scientific notation.

Accepted Answer

A)  6.34 x 1021  
B)  1.58 x 10-22 
C)  6.34 x 10-2 
D)  15.8 
A)  6.34 x 1021  
B)  1.58 x 10-22 
C)  6.34 x 10-2 
D)  15.8

Question 11

Convert the following numbers from scientific notation to ordinary decimal notation.
-9.0 x 10−3 ____________________

Accepted Answer

Question 12

Do the following calculation. How many significant figures are justified for the answer?
5.02 + 6.119 + 0.04117

Accepted Answer

A)  4 
B)  3 
C)  5 
D)  7 
A)  4 
B)  3 
C)  5 
D)  7

Question 13

Which of the following sources of experimental error can be classified as random error?

Accepted Answer

A)  The balance was not properly zeroed before weighing each sample. 
B)  The temperature in the room is not consistent. 
C)  The pipet used to measure a sample was not calibrated properly. 
D)  None of the above 
A)  The balance was not properly zeroed before weighing each sample. 
B)  The temperature in the room is not consistent. 
C)  The pipet used to measure a sample was not calibrated properly. 
D)  None of the above

Question 14

Round off the following numbers to 4 significant figures.
-245,864 ____________________

Accepted Answer

The answer of Round off the following numbers to 4...

Question 15

Do the following additions or subtractions, expressing your answers to the proper number of significant figures.
-4.63 + 7.014 − 1.200 ____________________

Accepted Answer

The answer of Do the following additions or subtractions, expressing...

Question 16

Water and vitamin C were added to a beaker. Calculate the mass of the beaker and its contents, and choose the answer with the appropriate number of significant figures.
146.20 g beaker + 23.1 g water + 0.34 g vitamin C =

Accepted Answer

A)  169.64 g 
B)  169 g 
C)  169.6 g 
D)  160 g 
A)  169.64 g 
B)  169 g 
C)  169.6 g 
D)  160 g

Question 17

Do the following multiplications and divisions, expressing your answers to the proper number of significant figures.
-86.40/12.095 ____________________

Accepted Answer

The answer of Do the following multiplications and divisions, expressing...

Question 18

If you were recording the volume of liquid in the pipet depicted, what volume would you record (to the correct number of significant figures)?

Accepted Answer

A)  4.557 mL 
B)  4.56 mL 
C)  5 mL 
D)  4.6 mL 
A)  4.557 mL 
B)  4.56 mL 
C)  5 mL 
D)  4.6 mL

Question 19

Which one of the following mathematical expressions is not evaluated correctly?

Accepted Answer

A)  10-3/106 = 10-9 
B)  108/106 = 102 
C)  10-2/10-4 = 102 
D)  10-3/10-6 = 109 
A)  10-3/106 = 10-9 
B)  108/106 = 102 
C)  10-2/10-4 = 102 
D)  10-3/10-6 = 109

Question 20

The number 1.987 x 106 in normal decimal notation is ________.

Accepted Answer

A)  1,987,000 
B)  198,700 
C)  19,870 
D)  19,870,000 
A)  1,987,000 
B)  198,700 
C)  19,870 
D)  19,870,000

How many numbers will be in the coefficient when 0.0090110 is expressed in scientific notation?

Do the following additions or subtractions, expressing your answers to the proper number of significant figures. -(6.3 x 10⁷) + (4.5 x 10³) ____________________

Perform the following mathematical operations and express the answers to the correct number of significant figures. -(235.8 + 15940 + 6.17) ÷ 1.987 = ____________________

A balance has an accuracy of ±0.01 grams. A beaker weighed 15 grams when weighed on this balance. Using the correct number of significant figures, the weight of the beaker should be recorded as ________.

Round off each of the following numbers to 3 significant figures. -0.00860 ____________________

Round off each of the following numbers to the number of significant figures indicated in parenthesis. -431.50 (three) ____________________

Express the following numbers in scientific notation. -623,000,000 ____________________

What is the correct exponential term for the following mathematical operation?

For each of the calculator-completed calculations on the left, determine the correct number of significant figures that the answer should have. Give your response using the choices on the right. ‪

Do the following calculation and express the answer using the correct scientific notation.

Convert the following numbers from scientific notation to ordinary decimal notation. -9.0 x 10⁻³ ____________________

Do the following calculation. How many significant figures are justified for the answer? 5.02 + 6.119 + 0.04117

Which of the following sources of experimental error can be classified as random error?

Round off the following numbers to 4 significant figures. -245,864 ____________________

Do the following additions or subtractions, expressing your answers to the proper number of significant figures. -4.63 + 7.014 − 1.200 ____________________

Water and vitamin C were added to a beaker. Calculate the mass of the beaker and its contents, and choose the answer with the appropriate number of significant figures. 146.20 g beaker + 23.1 g water + 0.34 g vitamin C =

Do the following multiplications and divisions, expressing your answers to the proper number of significant figures. -86.40/12.095 ____________________

If you were recording the volume of liquid in the pipet depicted, what volume would you record (to the correct number of significant figures)?

Which one of the following mathematical expressions is not evaluated correctly?

The number 1.987 x 10⁶ in normal decimal notation is ________.

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

How many numbers will be in the coefficient when 0.0090110 is expressed in scientific notation?

Do the following additions or subtractions, expressing your answers to the proper number of significant figures. -(6.3 x 107) + (4.5 x 103) ____________________

Perform the following mathematical operations and express the answers to the correct number of significant figures. -(235.8 + 15940 + 6.17) ÷ 1.987 = ____________________

A balance has an accuracy of ±0.01 grams. A beaker weighed 15 grams when weighed on this balance. Using the correct number of significant figures, the weight of the beaker should be recorded as ________.

Round off each of the following numbers to 3 significant figures. -0.00860 ____________________

Round off each of the following numbers to the number of significant figures indicated in parenthesis. -431.50 (three) ____________________

Express the following numbers in scientific notation. -623,000,000 ____________________

What is the correct exponential term for the following mathematical operation?

For each of the calculator-completed calculations on the left, determine the correct number of significant figures that the answer should have. Give your response using the choices on the right. ‪

Do the following calculation and express the answer using the correct scientific notation.

Convert the following numbers from scientific notation to ordinary decimal notation. -9.0 x 10−3 ____________________

Do the following calculation. How many significant figures are justified for the answer? 5.02 + 6.119 + 0.04117

Which of the following sources of experimental error can be classified as random error?

Round off the following numbers to 4 significant figures. -245,864 ____________________

Do the following additions or subtractions, expressing your answers to the proper number of significant figures. -4.63 + 7.014 − 1.200 ____________________

Water and vitamin C were added to a beaker. Calculate the mass of the beaker and its contents, and choose the answer with the appropriate number of significant figures. 146.20 g beaker + 23.1 g water + 0.34 g vitamin C =

Do the following multiplications and divisions, expressing your answers to the proper number of significant figures. -86.40/12.095 ____________________

If you were recording the volume of liquid in the pipet depicted, what volume would you record (to the correct number of significant figures)?

Which one of the following mathematical expressions is not evaluated correctly?

The number 1.987 x 106 in normal decimal notation is ________.

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

Do the following additions or subtractions, expressing your answers to the proper number of significant figures. -(6.3 x 10⁷) + (4.5 x 10³) ____________________

Convert the following numbers from scientific notation to ordinary decimal notation. -9.0 x 10⁻³ ____________________

The number 1.987 x 10⁶ in normal decimal notation is ________.