Chemistry SM-1232Week 1 Lesson 1

Dr. Jesse ReichAssistant Professor of Chemistry

Massachusetts Maritime AcademyFall 2010

Biography

• I grew up in Southboro, MA• I went to Bates college (1998-2001)• I went to Texas A&M University for my PhD

(2001-2005)• I worked for BASF (2005-2006)• I started teaching (2006-2008)• This is my first year at MMA, and I’ve also

started my own business (2008-)

Expectations

• You will come to class with a notebook and your laptop every week

• Chapter reading isn’t assigned, it’s assumed.• This is college, be quit in class, ask questions,

don’t complain, seek help as soon as you sense trouble.

• I expect you to copy class notes over!

The Wiki

• Your first homework assignment in addition to what is listed is to go to the wiki

• Reich-chemistry.wikispaces.com• Grades, assignments, projects, coursework,

class notes, and everything you need will be posted there.

• You will contribute to this class on one project through the wiki.

Wiki Log in

• Wikispaces requires a log in • You then have to sign up for my wiki

specifically• Go to www.wikispaces.com and make a log in

containing your first and last name • After you have created an account go to

reich-chemistry.wikispaces.com and on the left click “join this space.”

Extra Help• Most of you will need extra help.• Most of you won’t ask because you haven’t learned

that’s part of being a good student.• If you find you are falling behind get some help

quickly!• Email:blairjesseellynreich@gmail.com• Office Hours: third floor, back corner overlooking

the football field MW every other Friday 11:00-12:00.

• I’m only here MWF.

Grades

• 50% tests (a) • 15% lab (b)• 10% wiki (c)• 25% final (d)

0.5(a)+ 0.15(b) + 0.1(c) + 0.25(d)= Semester grade

Grades

• Grades are not scaled• Bonus points awarded during the semester

count toward your 4 semester test grades• Raw score= score on the test• Test grade= raw score + bonus points

Homework, Packets etc.

• This work is not mandatory for all students• Typically tests will be out of 150 points.• HW, packets, and quizes will add 10-15 bonus

points towards your next test• Students that have a failing test grade average

will be required to turn in all extra work until their average test score is above failing (60+)

Lab Grade

• I’m not in charge of your lab grade unless I happen to have been assigned as your lab instructor.

• I’ll get a grade from them and include it.• Don’t ask me what your lab grade is. I don’t

know it.

Last Semester

• Last Semester was much more culmulative• Formulas required rules, which required

names, and they had reactions based on rules and names.

This Semester

• This semester we’re looking at individual topics.• It’s much less cumulative.• It may feel a little more scattered.• Gas Laws, Intermolecular Forces, Solutions, Acids

and Bases, Chemical Equilibrium, Redox, Organic chemistry, and Nuclear chemistry all describe matter and how it works, but you don’t need Nuclear Chemistry to learn Gas Laws.

A typical Class

• 1/3 review• 2/3 new material• Bring your comp• Start it up• Load the wiki• Download the notes• Follow along• Have paper, a pen, and a calulator handy

Tests

• 1 per month basically.• Test days are subject to change.

Wiki Project

• You will put your newfound chemistry knowledge to use.

• You will apply your knowledge to creating solutions for a piece of the climate problem or the water shortage problem.

• You will post your presentation online available for classmates, scholars, friends, family, and employers to review.

Critical Review

• Molecular Mass = Sum of the mass of all elements times their respective atomic masses

• NH3 = N(1) + H(3)• 14(1) +1(3) = 17 amu• C6H12O6 = C(6) + H(12) + O (6)=• 12 (6) + 1(12) + 16 (6) = 180amu

1 Mole

• A mole is a number. It’s like a dozen, but instead of meaning 12 it means 6.02e23, which is the same as 6.02 x 10^23

• 1 mole of a compound also has an amount of mass equal to it’s atomic weight in grams.

• C6H12O6 has an atomic mass of 180 amu. 1 mole of C6H12O6 has a mass of 180g.

1 Mole

• All gasses take up the same amount of space. 22.4L of gas for every 1 mole of gas.

Conversion Factors

• We did this a lot last semester. Hopefully you know the term “Conversion Factor.” It’s the thing you multiple by to convert unit a into unit b.

Simple Examples

• Turn 350 bicycles into a number of wheels:• Turn 500 tricycles into a number of wheels:• Turn 20 octopuses into a number of legs:

• The ratio you are using to convert from unit a into unit b is what I call the “conversion factor.”

Simple Example

• Turn 500 wheels into a number of bicycles:• Turn 300 wheels into a number of tricycles:• Turn 24 arms into a number of octopi:

• How did your conversion factor change now that we’re going in the opposite direction?

Reciprocal

• That’s right, if you go in the opposite direction you have to multiply by the reciprocal. If you didn’t get this as your answer go check what you did.

Common Language of Word Problems

• Convert 64 legs into a number of octopi

• Convert is the verb• 64 is the number• Legs is the unit• Octopi is the unknown

Mole Map 1

Grams of your known (given)

substance

Moles of your known (given)

substance

Grams of your unknown substance

Moles of your unknown substance

XMultiply by 1 mol known____Molecular mass known

Multiply byMolecular mass unknown 1 mol unknown

Multiply by Molar RatioUse balanced equationMoles unknown Moles known

Conversion Factors for Gases

• Chapter 11 is about gases, in section 11.3 we’ll learn about pressure, and you’ll have to convert from 1 unit of pressure to another

11.2 Kinetic Molecular Theory

• First Lesson about Gasses: Welcome to your first bit of chemistry.

• 4 Basic assumptions of how gases behave1. Collection of particles in constant motion2. No attraction or repulsion between particles,

collisions are just like 2 frictionless balls.3. Tons of empty space relative to the size of the

particles.4. Particle speed increases with increased temp.

11.2 KMT

• Properties of Gases include1. Compressibility2. Assume the shape and volume of the

container3. Have low densities relative to liquids or solids

To Do List

• Read pages 357-373 for Friday.• Sign up at www.wikispaces.com and at my

personal wiki at reich-chemsitry.wikispaces.com.

• Come here before class to ensure that your computer can log onto the internet in this room.

• Bring your comp to class from now on.