EXAM TIME

2nd semester is all about stoichiometry!  Remember to make units cancel or it isn't going to work!

Suggestions for your FRONT only 3x5 card -    CHOOSE what you have trouble remembering.

• concentration of solutions formulas,
• a few polyatomic ions or chemical names/formulas as examples
• general equations for dissolution, acid/base reactions, or the basic rxn types
• one ICE table
• acid/base formulas - pH, pOH, Kw, etc.
• one K expression

ANSWER KEY TO EXAM REVIEW PROBLEM SET  - remember to bring this and your book to the exam!

Multiple Choice Practice with answers 

ACIDS and BASES TEST

Test tomorrow? Study suggestions.
 1. Scan chapter 12 in your book.  Stop and read if vocabulary terms aren't familiar to you.
 2. Read your notes or even scroll down to the last post and open the 3 powerpoints.
     Want a short version? Try sciencegeek.net slideshow Click on the Acids, pH and equilibrium slideshow and then the one for bases.
3.Make a list of things  to memorize - strong acids/strong bases/formulas/naming.
4. Look at your multiple choice quizzes.
5. Try the Questions for Review multiple choice!

 Try the pH part 2 practice at sciencegeek.net

The lecture notes posted on the blog post below! 

Here are the answers to Exercises 12.1 - 12.18

12.1a.  HNO2 and NO2- are a pair; water and hydronium
       b. phosphate and hydrogen phosphate; HF and F-

12.2 a. water   b. H2PO4-  (dihydrogen phosphate)     c. HC2O4-

12. 3 a. water   b. H2PO4-  (dihydrogen phosphate)     c.sulfate

12.4 a hypochlorous (contains the hypochlorite ion)
        b hydrosulfuric acid ( a binary acid)
         c oxalic acid (contains oxalate)
         d. phosphoric acid (contains phosphate ion)
          e. boric acid  (contains the borate ion)

12.5 a.  Agree Polyprotic means at least TWO H+ are present. If one H+ is donated then another can still be donated.
         b. AGREE  A negative ion can accept a proton.
         c. DISAGREE  A positive ion may not have a H+ to donate.  (Like metal cations - K+)

12.6 a. hydrogen sulfate ion (acid) carbonate ion (base)
            hydrogen carbonate ion (acid) sulfate ion (base)

        b.  hydrogen sulfate is a stronger aicd than hydrogen carbonate ion (See Ka table.)
        c. Stronger to weaker - to the right

12.7 a. 4      b. 2

12.8  1 x 10-6 M

12.9 a. 9     b. x = 1.0 x 10-5               c. Basic  More OH- than H+

12.10 a. pH=9        b pH= 12          c. pH= 1

12.11  [OH-] = 10-8

12.12     20 mL KOH

12.13 0.3 M NaOH

12.14 31 mL Ba(OH)2

12.15   a.  neutral  b. basic   c. basic   d. acid  e. acid    f. acid

12.16 Phosphate ion + water <-> hydrogen phosphate ion and HYDROXIDE

12.17 pH= 1.8    SHOW YOUR ICE table

12.18  SHOW TWO ICE TABLES   - Solve first for Ka which is 1x 10-6
            Use Ka and the 2nd table to solve for a pH of 3.5

Acid/Base Study Help

• Quiz tomorrow - Know names and formulas for strong acids and bases/Know acid/base pairs

•  Collecting "Strength of Acids" tomorrow!
• Acids and Bases Lecture Notes - part 1/introduction    part 2 pH  part 3: titration
• Have you begun your Solutions Project? It's due May 2.

 Try the pH part 2 practice at sciencegeek.net

QUIZLET FUN - Study your nomenclature of acids and bases. I used vocab terms as well!

Choose a Study ModeScatterLearnFlashcards

Study these flash cards | Study acids flash cards

Acid and Base Mindmap

I discovered a free mind mapping tool today.  I know many of you have used mind maps.  With text2mindmap you just enter your outline and it creates a mind map. Freeze the map to manipulate after your color choices are made.  Save the map as a jpg file when you are done.  This is a GREAT product #5 for the chapter 8 solutions project. (Use 15 or more terms in your mindmap!)

Here's my acid/base mindmap to show you what you are going to learn in this acid/base chapter.

Equilibrium

PowerPoint Notes about the Equilibrium Constant and  LeChatlier's Principle  (Have you read chap 11?)

Sciencegeek Equilibrium Practice

Brightstorm Calculation Help

800mainstreet - a good review site

LeChat - 4 questions with answer KEY

Quiz with Answers

Test Like MULTIPLE CHOICE PRACTICE with KEY

You have LOTS of resources above to study with.  I recommend reading the notes ppt through carefully and if you haven't reading the chapter.  Of course you should look at the problem sets.  You'll find this chapter very logical, but you must memorize a few key pieces.  To memorize its best to study in shorter sessions and even better if you sleep between them.  Good luck studying for Monday's test.

Thermodynamics

Here is a great  multiple choice review at sciencegeek.net. 

READING GUIDE ANSWER KEY - ALL SIX PAGES
 - updated link 

QUIZ tomorrow.  Know what G, S, and H are and know their units!
                               Know the equation that relates them!

Studying for Thermochemistry

The powerpoint will be posted on 3/26 on the assignment calendar.
 Here is the Hess's Law practice with answers.
Another great place to study is actually from sparknotes: we do not have to calculate enthalpy from bond energies, but everything else matches our unit.
Your reading guide is very useful; this book has good concise explanations for this chapter. We have already looked at the endo and exothermic energy diagrams in chapter 9 that include activation energy. Don't forget about those.
Here is the heat of solution lab that we completed or will complete in the computer lab.
Email me if I can post something else for you!

Concentration of Solutions

Problem Set Answers - Proper sig figs may not be represented here. I believe they are all within reason.
8.8a 4 M, b 0.25 M, c 1 M
8.9 504 g HNO3, 144 g glucose
8.10 0.2 M
8.11  4 M Na+  (Please include the M of the sodium carbonate solution.)
8.12 1.6 M
8.13 0.47 molal
8.14 Use the density of benzene to calculate mass.   0.284 molal
Review your quiz with molarity, molality, mole fraction, and % mass for the QUIZ 3/2
 

Extra Practice? 
All of these at sciencegeek at great practice for your chem math skills. g/L and ppm are not on our quiz!

Another Sciencegeek.net practice page
All eight of these are great quiz practice

Multiple Choice Q and A
These are more like the test questions you usually see.

Stoich practice

Click here to practice stoichiometry problems for your test!

Stoich review problems - Mrs. J's Chemistry page has a great problem set with answers!

Materials Science is FUN!

Thank you to our guest speaker today! Here's the butterfly video he mentioned!
Clemson has a great materials science program and we enjoyed seeing plasma created right before our eyes!

GREAT STOICH TESTS

GREAT WORK ODY on STOICH and predicting products! Let's make our next test grades as good guys! Honors, I know your tests Wed will show your hard work too! Stoichiometry uses dimensional analysis and it's a skill we call on the rest of the year so I am so pleased when you get it! And if you didn't we'll work on it; come see me to schedule a day to work one on one. Next chapter is SOLUTIONS. Well, not exactly next. We are starting to discuss solutions, but we will be going to the computer lab to begin working on the open book edmodo quizzes. If you have time to go ahead and read chapter 6, it will make your work load lighter this week. Have a great weekend. Read your cereal box or shampoo bottle if you don't do any other chemistry.

Types of Reactions Lab

Dropbox

I love Dropbox.com because it is so easy to put a file in my public folder and then copy a link to it! I also love that every document I saved last night is right at my fingertips this morning with no additional clicks.

See public folder link

Bottom right hand corner of my screen

Studying with the TEST in mind: Empirical Formulas

Did you review your polyatomic ions? Please do! Click here to study with quizlet.
Empirical - should make you think of lab or experimental data.  However, empirical formulas are those that are in simplest terms.
*Remember the steps for finding empirical formula:
               1. Find grams. 2. Find moles. 3. Find subscripts. (Compare moles.)

Empirical and Molecular Formula Problems to Practice (with Answers)

Molecular Formulas and % Composition from chemfiesta (with answers)

Brightstorm video of Empirical and Molecular Formulas


These flashcards cover lots of review items as well as our newest vocabulary and problem types.

Choose a Study ModeScatterLearnFlashcards

Study these flash cards | Study chemistry flash cards

Chapter 7 Exercise Answers

** 7.11 has been corrected
ODY - Remember that your problem set is due on test day (probably Friday 1/20) and that your work must lead to these answers for credit.  Units must be included. Please slash through units as they cancel. Your work may look different but should lead to the same answer with the same units/sig figs.

Honors - You have begun these exercises. Check the ones you should have completed. We will cover the rest the following week.

7.1 a. 2.0 mol water   d. 2.00 mol carbon dioxide

7.2 a 27 g water         d. 4.04 g molecular hydrogen

7.3 a 67 L Ar             d. 90. L helium

7.4 a 1.25 g/L             d. 0.761 g/L

7.5 44.4 g/mol

7.6 63.8 g/mol

7.7 Ne is twice as fast moving as Kr  (Graham's law is not on this test.)

7.8 a 42.88% C, 57.12% O     b 46.21% Zn, 19.86% Si, 33.93% O    c 3.09% H, 31.60% P, 65.31%O

7.9 45.691% water                           7.10 no calculations just give formula in simplest terms

7.11 a CH₂O     b Ca₃P₂      c Al(ClO₄)₃

7.12 a  CaCl₂     b   CsCl           c Al₂S₃       d Ni(NO₃)₂

7.13 C₆H₆

7.14 C₅H₁₀

7.15 C₄H₁₀

7.16 C₉H₈O₄

Honors Practice Test

Review of Nomenclature Multiple Choice Questions

Honors these are the questions I promised. Odyssey students you could see them as test questions one day as well. Answers are listed if you scroll down far enough.

The essay question requires you to explain nomenclature - make sure you know that molecules generally contain just nonmetals and that we use prefixes to name these. Ex. S02  is sulfur dioxide

Class Notes: Formula Calculations

This powerpoint (click the one titled Formula Calculations) is the one I used in class. You can also find it on the assignment page - click on the paperclip.

Here is another link that explains empirical formula from percentage composition.

The trick to chemistry to practice all the problem solving patterns so here is a link to a powerpoint with more examples. And then a worksheet with 3 questions (and answers!) to practice.

Happy Studying!

Edmodo

There is a poll on Edmodo that I'd love to see your answers too. It has come to my attention that I left off AP Chem inadvertently...Certainly do want you to consider that one too!!!

You can log in at edmodo.com with the group code you got in class. Parents, I will send home your parent code soon. I'm still figuring out that piece but we certainly want you to be included. This is a facebook like environment without the privacy issues of regular social networking. It targets students and teachers and includes tools like quizzes. I hope it makes school one little bit more fun or less stressful for our students!

Happy New Year!!!!
Welcome Back to School.  We will be studying nomenclature this week as schedules change.
Hopefully you know enough about bonding that this seems easy. If not everything you need to know will be covered in class. There are excellent practice activities at sciencegeek.net  and lots of other websites.  There are some quizzes coming up on edmodo so we need to be signing up there.  Look for codes on the board during class. I hope edmodo will be a fun addition.

THURSDAY is the polyatomic ions quiz! Please study at quizlet. Or make flashcards from your list you received in class. Here's a link to an ugly google docs version of the list (charges are not superscripts).