MATH225, Fall 2012
Worksheet 2 (1.1, 1.2)
Due Friday, Aug. 31st
Name:
Section:
For full credit, you must show all work and box answers.
1. For the following, state the order of the differential equation and determine whether it is linear or nonlinear.
(a)

MATH225, Fall 2012
Worksheet 5 (3.1, 3.2)
Name:
Recitation Section:
Due: September 21st, In class
For full credit, you must show all work and box answers.
1. Initially 100 milligrams of a radioactive substance was present. If the rate of decay is proporti

Exam #2
CHGN221
6/7/11
ANSWER KEY as of 6/14/11
Name:
1. True or False: Catalysts increase both forward and reverse reaction rates by the same factor. TRUE.
2. True or False: Raising the temperature usually increases both forward and reverse reaction rate

Practice Set B
with answers
Answers to questions 1 & 15 corrected as of 5/24/11
1. True or False: 1,1-dicyclopropylcyclopentane has the molecular formula C11H18. TRUE. Note that an
unbranched, noncyclic alkane with 11 carbons is C11H24 , but this molecule

Exam #3
CHGN221
6/20/11
Answer Key as of 6/20/11
1. True or False: Methanol (MeOH) is a polar protic donating solvent. TRUE
2. True or False: Sodium ethoxide is a weaker base than is sodium ethanethiolate. FALSE. EtSH is a stronger
acid than is EtOH (sinc

Practice Set A
with answers
as of 5/17/11
1. True or False: Carbon dioxide is a linear molecule. True
2. True or False: Carbon dioxide is a polar molecule. False. It has polar bonds but the bond dipoles cancel.
3. What is the hybridization of carbon in ca

Exam #1
CHGN221
5/25/11
ANSWER KEY as of 5/30/11
Name:
1. True or False: H2Te is a stronger acid than is AsH3. TRUE.
2. True or False: Water has a smaller pKb value than does NH3. FALSE. Water is a weaker base than
ammonia, so it has a large pKb value. We

MATH225, Fall 2012
Worksheet 4 (2.2, 2.3)
Name:
Recitation Section:
For full credit, you must show all work and box answers.
1. Solve the following differential equations or initial-value problems by separation of variables. Put your solutions in
explicit

MATH225, Fall 2012
Worksheet 1 (Review)
Due Friday, Aug. 24th
Name:
Section:
For full credit, you must show all work and box answers.
1. Find the roots of the following polynomials. (Solve for r.)
(a) 3r 7 = 0
(b) r2 + 3r + 2 = 0
(c) r2 + 4r + 2 = 0
(d) 3

MATH225, Fall 2012
Worksheet 3 (1.3, 2.1)
Name:
Recitation Section:
For full credit, you must show all work and box answers.
1. (a) Match the following direction (slope) fields to the correct differential equation. (All the direction fields are
graphed fo