Wednesday, September 29, 2010

 

Wednes-Day 1

Physics - did Motion Ditto 3 problems in which we encountered our first TWO STEP problem. Sometimes, based on the DATA GIVEN right in the question, you will have to solve for ONE unknown variable (usually time, but in this case, acceleration). Once you solve for that unknown, you plug that answer into a different equation to solve for the variable that was asked for.
TWO STEP problems are more difficult, naturally, so we will practice more of them soon.

We then did our first graphical analysis of motion lab in which we analyzed the motion of a cart via a click-timer.

AP Chem - HERE IS A LIST OF THE QUESTION TYPES ON TOMORROW'S EXAM:

1. Write and balance (including phase labels) the formula, ionic, and net ionic equations for
a. double replacement with precipitation reactions
b. double replacement acid-base neutralization reactions

2. Percent composition to empirical formula to molecular formula problems
and/or the REVERSE.

3. Determination of atomic mass from isotope masses and respective percent abundances
and/or the REVERSE.

4. Combustion analysis to determine the empirical formula and molecular formula of an organic compound.

5. Gravimetric analysis to determine the atomic mass of an unknown element in a compound.

There are NO questions on our current STOICHIOMETRY unit.
Also, I will not ask about the FOUR separation of mixture techniques BUT I will have questions about those techniques on an upcoming quiz or future test.


STUDY THOROUGHLY by reviewing/copying NOTES and doing practice questions.


Email me if you have questions or see me at extra help at 8AM in Room 306 on Thursday.

Today we applied limiting reactant stoichiometry to the reaction for the synthesis of urea. We determined the masses consumed and produced for all substances by first converting all masses to MOLES, and then using the mole ratios from the balanced equation.
We also determined and explained percent yield. 

update 8:45 PM - just posted the questions and answers to the equation writing hw from a few weeks ago - just another resource for the exam preparation.



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