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!