who: you and me (mike payne) who: you and me (mike payne) what: chemistry 400 (general chemistry i)...
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Who: You and Me (Mike Payne)What: Chemistry 400 (General Chemistry I)When: Tuesdays and Thursdays 3:00 PMWhere: HereWhy: …
Welcome!
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
LiquidIndefinite (variable) shape
Definite (fixed) volume
NOT compressible
Very little space between
More ordered than gas
Moderate KINETIC energy
High relative density
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.