Errata/Corrections: 

The author appreciates the reporting of any errors via email. 

Corrections are made as soon as possible, and corrected versions are posted.  

Users are encouraged to access modules from the website home and download page, and not from direct links to the PDF files.  Direct links often go to older versions; the links on the website list the most recent version.

Corrections below are listed in the chronological order in which they were made. 

In versions prior to September 6, 2007

In versions prior to Sept 23, 2007

1.  In section 5B, the 55 mi/hr drive problem in the text, the answer should be 1.0 x 10² min with 2 sig figs.

2.  In Lesson 13B, on balancing the hydroxide neutralization, the equations are correct but the calcium and phosphate ions are not "spectators" since they will precipitate during the acid-base reaction (see later Lesson 15B).

3.    In Lesson 14H, last problem (#3), last step, it should check with "zero charge on both sides.."

In versions prior to October 6, 2007

4.  In lesson 7B, on the polyatomic hydroxide ion, oxygen has 8 protons and electrons, and both the neutral H-O-H particle and hydroxide ion have 10 electrons.

In versions prior to Jan 11, 2008

5.  In lesson 8D, Problem 1, the SOLVE step is correct, but the DATA should read

    DATA:  3.55 g Cl₂

                   71.0 g Cl₂ = 1 mol Cl₂         (grams prompt)

In versions prior to Jan 21, 2008

6.  In lesson 8D, new Problem 3, the exponent in the answer should be 13.

7.  In lesson 6D, in the flashcards at the end, the ¹H isotope should have 0 n⁰ and 1 p⁺.

8.  In Lesson 3C, last problem 4f should be division, not multiplication, of the two terms.

In versions prior to Jan 28, 2008

9.  In Lesson 7B, in the ion flashcards, ClO₂^--   should be chlorite.

150,  In Lesson 24H(Kinetics), at the last step of the last example should be 19 minutes, not seconds.

11.  In Lesson 8D, Answer 2 should be 0.21 kg and answer 3 should be 4.82 x 10^13 atoms S.

In versions prior to March 16, 2008

12. In Equlilbrium Lesson 25F, Practice C, Problem 1B, the numeric substitution in the denominator is reversed.  The answer should be 8.0 M.

13. In Weak Acid Lesson 27F, Practice A, Problem 1C, the A and B labels should be switched on both sides.

14.  In Lesson 8A, in the second example, 602 should be 60.2 

In versions prior to May 16, 2008

15.  In Lesson 11E, in the chart of derived quantities, the definition of energy should be mass times acceleration times distance.  The units shown are correct.

In versions prior to May 28, 2008

16.  In Lesson 8C, Practice B2a, 0.200 moles should be 200. moles.

17.  In Graphing Lesson 19F, in the last practice problem, 0.0120 M should be 0.120 M.  The slope calculation is correct.