Who: You and Me (Mike Payne)What: Chemistry 400 (General Chemistry I)When: Tuesdays and Thursdays 3:00 PMWhere: HereWhy: …

Welcome!

Adds…

Syllabus

A few… cautionsSTUDY!!! (9-12 hours PER WEEK!!!)

A few… cautionsSTUDY!!! (9-12 hours PER WEEK!!!)TardinessCell phones, PDAs, MP3s, technology in generalFollow along in classAsk questions!!!Respect for your fellow studentsMake mistakesLearn your nomenclature!

% Overall Nomenclature Points Lost versus Final Grade

y = -6.62x + 1.04

R2 = 0.80

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Percent of Total Semester Points Lost to Nomenclature

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Pass/Fail Line

A few… cautionsSTUDY!!!TardinessCell phones, PDAs, MP3s, technology in generalFollow along in classAsk questions!!!Respect for your fellow studentsMake mistakesLearn your nomenclature!Do the homework/reading

Chem 4 - Fall 2008 HW vs. Gradey = 0.827x + 0.0828

R2 = 0.9006

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5.0% 15.0% 25.0% 35.0% 45.0% 55.0% 65.0% 75.0% 85.0% 95.0% 105.0%

Homework Percentage

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Homework Grade versus Overall Grade

Announcements Course Website Read for Thursday:

Chapter 2: All Read for Tuesday

Chapter 3: Sections 1-3 HOMEWORK – DUE Tuesday 9/1/15

HW-BW 1 (Homework Bookwork) #’s 4-9 all, 21, 26, 30, 36, 39, 44, 47, 49, 53-69 odd, 78, 80, 81

HW-WS 1 (Homework Worksheet) (from course website) Lab Wednesday/Thursday

EXP A Lab Monday/Tuesday

EXP #1

Chemistry: The study of the properties and transformations of matter.

Property: A characteristic that can be used to describe a substance. Substances have both physical and chemical properties.

Transformations: A change in the properties of matter with time. There are physical changes and chemical changes.

Matter: Anything that has mass and occupies space – things you can see, touch, taste, or smell.

Substances have both physical and chemical properties.

Physical Properties: Density, color, and melting point are physical properties of matter. Observing a physical property can be done without altering the makeup of a substance.

Physical Change: Does not alter the chemical makeup of a substance.

Chemical reactivity is unchanged.

Changes in state, changes in particle size, and the formation / separation of mixtures are all

examples of physical change.

Melting of ice to form liquid water is a physical change. In this case only a change in

form takes place. The chemical makeup of the substance remains H2O.

Substances have both physical and chemical properties.

Chemical Properties: Chemical composition, what matter is made of, and chemical reactivity, how matter behaves, are chemical properties. Observing a chemical property alters the substance.

Chemical Change: Alters the makeup of a

substance. Reactivity changes with

the formation of new substances.

Heat, light, or electrical energy is often emitted or absorbed.

Potassium reacting with water is an example of a chemical change.

Identify Each as Chemical or Physical Property

1. Helium is a gas at room temperature

2. H2O boils at 100oC

3. H2S(g) smells bad

4. HCl reacts with cotton

5. H2(g) is less dense than O2(g)

6. H2(g) reacts with O2(g)

1. physical

2. physical

3. chemical

4. chemical

5. physical

6. chemical

GasIndefinite (variable) shape

Indefinite (variable) volume

Highly compressible

HUGE amounts of space

Highly disordered!!

Lots of KINETIC energy

Low relative density

CONDENSATION!!!!!

LiquidIndefinite (variable) shape

Definite (fixed) volume

NOT compressible

Very little space between

More ordered than gas

Moderate KINETIC energy

High relative density

FREEZING!!!!!

SolidDefinite (fixed) shape

Definite (fixed) volume

NOT compressible

Tightly packed

Well ordered (organized)

Little KINETIC energy

High relative density

Phase Transitions!!

solid liquid gasmelting boiling

freezing condensation

sublimation

deposition

ADD ENERGY

REMOVE ENERGY

Energy in Chemistry

Energy is the ability to do work.

Potential Energy is energy due to the position of an object.

Kinetic Energyis energy due to the movement of an object.

Total Energy = Potential Energy + Kinetic Energy

Two types of energy to be concerned with:

A system of oppositely charged particles. The potential energy gained when the charges are separated is converted to kinetic energy as the attraction pulls these charges together.

Potential energy is converted to kinetic energy.

A system of fuel and exhaust. A fuel is higher in chemical potential energy than the exhaust. As the fuel burns, some of its potential energy is converted to the kinetic energy of the moving car.

Potential energy is converted to kinetic energy.