Friday Feb 4, 2001

Regular and Honors Chemistry -
Starter:
Using the following standard enthaplies of formation determine the change in enthalpy for the reaction...
2H2S (g) + 3 O2 (g) --> 2 H2O (l) + 2 SO2 (g)

H2S (g)= -20.1 kJ/mole
O2 (g) = 0.0 kJ/mole
H2O (l)= -241.8 kJ/mole
SO2 (g)= -296.1 kJ/mole

Corrected 3.5 Worksheet Hess' Law

Work Day on Term Project!

Summary:
Given enthalpy = +345 kJ T= 350 K and entropy = +0.183 kJ/K Find "Gibbs" free energy and then tell what each number means.

Homework: 3.6 Heat Exchange problems next time



AP Chemistry-
Starter -
AP Review Starter 2.4
A - Remember to attach the correct units!
B- Use the correct # of significant figures!
C - SHOW ALL WORK FOR FULL CREDIT !!!
1 Find the Formula Mass of Pb3N2
2 Convert 3.24 g of BaCl2 to moles
3 Convert 45.6 moles of LiMnO4 to grams
4 Convert 7.56 x 10^25 molecules CaF2 to grams
5 Convert 35.472 g of (NH4)2CO3 to molecules

Work Day - ALL LATE WORK IS DUE TODAY! EVERYTHING NEEDS TO BE CORRECTED AND TURNED IN! I WILL NOT ACCEPT LATE WORK FOR CREDIT AFTER TODAY. I WILL BE FOLLOWING THE DISCLOSURE. LATE 1/2 OFF FOR 1 WEEK THEN 0.


Homework - 3.8 bookwork

Also get Lab 3.5 Buffers ready to do.

Summary -
AP Review Summary 2.4

A - Remember to attach the correct units!
B - Use the correct # of significant figures!
C - SHOW ALL WORK FOR FULL CREDIT !!!

1 Given 13.542 moles of Kr at STP what is the volume that this gas will occupy?
2 What is the percent composition for each element in
Al(ClO4)3 ?
3 Nylon, contains 61.2 % carbon, 14.2 % hydrogen, and 24.6 % nitrogen. It has a molecular mass of about 465. What are its empirical and molecular formulas?
4 Find the formula for the hydrate that has 54.5 % AlK(SO4)2 and 45.5% H2O
5 What is the empirical formula for C14H16N4?