Who: You and Me (Mike Payne) Who: You and Me (Mike Payne) What: Chemistry 400 (General Chemistry I) What: Chemistry 400 (General Chemistry I) When: Tuesdays and Thursdays 3:00 PM When: Tuesdays and Thursdays 3:00 PM Where: Here Where: Here Why: … Why: … Welcome!

Adds…

Syllabus

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

A few… cautions STUDY!!! (9-12 hours PER WEEK!!!) STUDY!!! (9-12 hours PER WEEK!!!) Tardiness Tardiness Cell phones, PDAs, MP3s, technology in general Cell phones, PDAs, MP3s, technology in general Follow along in class Follow along in class Ask questions!!! Ask questions!!! Respect for your fellow students Respect for your fellow students Make mistakes Make mistakes Learn your nomenclature! Learn your nomenclature!

A few… cautions STUDY!!! STUDY!!! Tardiness Tardiness Cell phones, PDAs, MP3s, technology in general Cell phones, PDAs, MP3s, technology in general Follow along in class Follow along in class Ask questions!!! Ask questions!!! Respect for your fellow students Respect for your fellow students Make mistakes Make mistakes Learn your nomenclature! Learn your nomenclature! Do the homework/reading Do the homework/reading

Homework Grade versus Overall Grade

Announcements Course Website Course Website Read for Thursday: Read for Thursday: Chapter 2: All Chapter 2: All Read for Tuesday Read for Tuesday Chapter 3: Sections 1-3 Chapter 3: Sections 1-3 HOMEWORK – DUE Tuesday 9/1/15 HOMEWORK – DUE Tuesday 9/1/15 HW-BW 1 (Homework Bookwork) #’s 4-9 all, 21, 26, 30, 36, 39, 44, 47, 49, odd, 78, 80, 81 HW-BW 1 (Homework Bookwork) #’s 4-9 all, 21, 26, 30, 36, 39, 44, 47, 49, odd, 78, 80, 81 HW-WS 1 (Homework Worksheet) (from course website) HW-WS 1 (Homework Worksheet) (from course website) Lab Wednesday/Thursday Lab Wednesday/Thursday EXP A EXP A Lab Monday/Tuesday Lab Monday/Tuesday EXP #1 EXP #1

The study of the properties and transformations of matter. Chemistry: The study of the properties and transformations of matter. A characteristic that can be used to describe a substance. Substances have both physical and chemical properties. Property: A characteristic that can be used to describe a substance. Substances have both physical and chemical properties. A change in the properties of matter with time. There are physical changes and chemical changes. Transformations: A change in the properties of matter with time. There are physical changes and chemical changes. Anything that has mass and occupies space – things you can see, touch, taste, or smell. Matter: Anything that has mass and occupies space – things you can see, touch, taste, or smell.

Substances have both physical and chemical 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 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.

Does not alter the chemical 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 H 2 O.

Substances have both physical and 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 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. H 2 O boils at 100 o C 3. H 2 S (g) smells bad 4. HCl reacts with cotton 5. H 2(g) is less dense than O 2(g) 6. H 2(g) reacts with O 2(g) 1. physical 2. physical 3. chemical 4. chemical 5. physical 6. chemical

Gas Indefinite (variable) shape Indefinite (variable) volume Highly compressible HUGE amounts of space Highly disordered!! Lots of KINETIC energy Low relative density

CONDENSATION!!!!!

Liquid Indefinite (variable) shape Definite (fixed) volume NOT compressible Very little space between More ordered than gas Moderate KINETIC energy High relative density

FREEZING!!!!!

Solid Definite (fixed) shape Definite (fixed) volume NOT compressible Tightly packed Well ordered (organized) Little KINETIC energy High relative density

Phase Transitions!! solidliquidgas meltingboiling freezingcondensation 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 Energy is 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.