Question 1

Express the following exponential expressions in correct scientific notation.
-430 x 10−2 ____________________

Accepted Answer

Question 2

Carry out the following calculations. Express your answer to the proper number of significant figures.

Accepted Answer

A)  15174 
B)  15200 
C)  15000 
D)  15170 
A)  15174 
B)  15200 
C)  15000 
D)  15170

Question 3

In which one of the following numbers are none of the zeros significant?

Accepted Answer

A)  298.010 
B)  3100 
C)  0.00001470 
D)  2.70400 
A)  298.010 
B)  3100 
C)  0.00001470 
D)  2.70400

Question 4

A lab technician was assigned the task of determining the density of a sample of blood plasma. The technician performed three replicate measurements of the density of the sample and reported the following results:
0.810 g/mL, 1.375 g/mL, 2.046 g/mL
The actual density of blood plasma is 1.027 g/mL. 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 5

Do the following multiplications and divisions, expressing your answers to the proper number of significant figures.
-(7.0 x 10-6) x (3.00 x 104) ____________________

Accepted Answer

Question 6

Which one of the following numbers contains 4 significant figures?

Accepted Answer

A)  6.43 
B)  39.4 
C)  0.0257 
D)  0.2570 
A)  6.43 
B)  39.4 
C)  0.0257 
D)  0.2570

Question 7

Using scientific notation, express the number five million five hundred thousand to 4 significant figures.

Accepted Answer

The answer of Using scientific notation, express the number five...

Question 8

Round off each of the following numbers to 3 significant figures.
-1900 ____________________

Accepted Answer

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

Question 9

Express the following numbers in scientific notation.
-6,473 ____________________

Accepted Answer

The answer of Express the following numbers in scientific notation.
-6,473...

Question 10

Which measuring device below is the most accurate for measuring volume?

Accepted Answer

A)  a beaker calibrated in 1 milliliter units 
B)  a graduated cylinder calibrated in 0.5 milliliter units 
C)  a graduated pipet calibrated in 0.1 milliliter units 
D)  a buret calibrated in 0.02 milliliter units 
A)  a beaker calibrated in 1 milliliter units 
B)  a graduated cylinder calibrated in 0.5 milliliter units 
C)  a graduated pipet calibrated in 0.1 milliliter units 
D)  a buret calibrated in 0.02 milliliter units

Question 11

Perform the following mathematical operations and express the answers to the correct number of significant figures.
-[10-7 x 106 x 104] / [10-5 x 109] = ____________________

Accepted Answer

Question 12

Which of the following contain three significant figures?
I. 326.0
II. 0.00310
III. 46,900
IV. 1.070
V. 0.020

Accepted Answer

A)  II, III, and V 
B)  II and III 
C)  IV and V 
D)  I, III, and IV 
A)  II, III, and V 
B)  II and III 
C)  IV and V 
D)  I, III, and IV

Question 13

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

Accepted Answer

A)  25.700 mL 
B)  25.7 mL 
C)  25 mL 
D)  25.70 mL 
A)  25.700 mL 
B)  25.7 mL 
C)  25 mL 
D)  25.70 mL

Question 14

Round off the following numbers to 4 significant figures.
-15000 ____________________

Accepted Answer

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

Question 15

The correct answer obtained by dividing 4.65 x 105 by 9.4 x 10?2 together is ________.

Accepted Answer

A)  2.0 x 10-7 
B)  2.02 x 10-7 
C)  4.9 x 106 
D)  4.95 x 106 
A)  2.0 x 10-7 
B)  2.02 x 10-7 
C)  4.9 x 106 
D)  4.95 x 106

Question 16

If the accepted value for the length of an object is 6.78 cm, which of the following sets of experimental results is best described as both precise and accurate?

Accepted Answer

A)  6.78 cm, 6.38 cm, 6.48 cm (average = 6.55 cm) 
B)  6.79 cm, 6.78 cm, 6.77 cm (average = 6.78 cm) 
C)  6.71 cm, 6.71 cm, 6.72 cm (average = 6.71 cm) 
D)  6.88 cm, 6.88 cm, 6.58 cm (average = 6.78 cm) 
A)  6.78 cm, 6.38 cm, 6.48 cm (average = 6.55 cm) 
B)  6.79 cm, 6.78 cm, 6.77 cm (average = 6.78 cm) 
C)  6.71 cm, 6.71 cm, 6.72 cm (average = 6.71 cm) 
D)  6.88 cm, 6.88 cm, 6.58 cm (average = 6.78 cm)

Question 17

Round off the following numbers to 4 significant figures.
-398.845 ____________________

Accepted Answer

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

Question 18

Do the following additions or subtractions, expressing your answers to the proper number of significant figures.
-3.070 − 3.050 ____________________

Accepted Answer

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

Question 19

Round off each of the following numbers to the number of significant figures indicated in parenthesis.
-0.45 (one) ____________________

Accepted Answer

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

Question 20

The number 3009.1 expressed in scientific notation to the correct number of significant figures becomes ________.

Accepted Answer

A)  3.01 x 103 
B)  3.009 x 104 
C)  3.0091 x 10-3 
D)  3.0091 x 103 
A)  3.01 x 103 
B)  3.009 x 104 
C)  3.0091 x 10-3 
D)  3.0091 x 103

Express the following exponential expressions in correct scientific notation. -430 x 10⁻² ____________________

Carry out the following calculations. Express your answer to the proper number of significant figures.

In which one of the following numbers are none of the zeros significant?

Do the following multiplications and divisions, expressing your answers to the proper number of significant figures. -(7.0 x 10^-6) x (3.00 x 10⁴) ____________________

Which one of the following numbers contains 4 significant figures?

Using scientific notation, express the number five million five hundred thousand to 4 significant figures.

Round off each of the following numbers to 3 significant figures. -1900 ____________________

Express the following numbers in scientific notation. -6,473 ____________________

Which measuring device below is the most accurate for measuring volume?

Perform the following mathematical operations and express the answers to the correct number of significant figures. -[10^-7 x 10⁶ x 10⁴] / [10^-5 x 10⁹] = ____________________

Which of the following contain three significant figures? I. 326.0 II. 0.00310 III. 46,900 IV. 1.070 V. 0.020

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

Round off the following numbers to 4 significant figures. -15000 ____________________

The correct answer obtained by dividing 4.65 x 10⁵ by 9.4 x 10^?2 together is ________.

If the accepted value for the length of an object is 6.78 cm, which of the following sets of experimental results is best described as both precise and accurate?

Round off the following numbers to 4 significant figures. -398.845 ____________________

Do the following additions or subtractions, expressing your answers to the proper number of significant figures. -3.070 − 3.050 ____________________

Round off each of the following numbers to the number of significant figures indicated in parenthesis. -0.45 (one) ____________________

The number 3009.1 expressed in scientific notation to the correct number of significant figures becomes ________.

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

Express the following exponential expressions in correct scientific notation. -430 x 10−2 ____________________

Carry out the following calculations. Express your answer to the proper number of significant figures.

In which one of the following numbers are none of the zeros significant?

Do the following multiplications and divisions, expressing your answers to the proper number of significant figures. -(7.0 x 10-6) x (3.00 x 104) ____________________

Which one of the following numbers contains 4 significant figures?

Using scientific notation, express the number five million five hundred thousand to 4 significant figures.

Round off each of the following numbers to 3 significant figures. -1900 ____________________

Express the following numbers in scientific notation. -6,473 ____________________

Which measuring device below is the most accurate for measuring volume?

Perform the following mathematical operations and express the answers to the correct number of significant figures. -[10-7 x 106 x 104] / [10-5 x 109] = ____________________

Which of the following contain three significant figures? I. 326.0 II. 0.00310 III. 46,900 IV. 1.070 V. 0.020

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

Round off the following numbers to 4 significant figures. -15000 ____________________

The correct answer obtained by dividing 4.65 x 105 by 9.4 x 10?2 together is ________.

If the accepted value for the length of an object is 6.78 cm, which of the following sets of experimental results is best described as both precise and accurate?

Round off the following numbers to 4 significant figures. -398.845 ____________________

Do the following additions or subtractions, expressing your answers to the proper number of significant figures. -3.070 − 3.050 ____________________

Round off each of the following numbers to the number of significant figures indicated in parenthesis. -0.45 (one) ____________________

The number 3009.1 expressed in scientific notation to the correct number of significant figures becomes ________.

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

Express the following exponential expressions in correct scientific notation. -430 x 10⁻² ____________________

Do the following multiplications and divisions, expressing your answers to the proper number of significant figures. -(7.0 x 10^-6) x (3.00 x 10⁴) ____________________

Perform the following mathematical operations and express the answers to the correct number of significant figures. -[10^-7 x 10⁶ x 10⁴] / [10^-5 x 10⁹] = ____________________

The correct answer obtained by dividing 4.65 x 10⁵ by 9.4 x 10^?2 together is ________.