December 6th, 2013

At The Beginning of Class

Today we checked in the Lab and the notes of the two power points

Atomic Scientists - Quick Review (Quick and Dirty Review)

Notes will be posted in Unit 6 Handouts

-Dalton

- Was the first to synthesize lots of data on the atom

- Came up with ¨postulates¨ on the atom

- ¨Atomos¨

- LAWS:

- Conservation of Mass, Definite proportions, multiple proportions

- Indivisible particle (depiction of Dalton's atom)

-Thomson

- ELECTRON

- Famous for using Cathode ray tube experiments

- Negatively charged particle that he was able to pull off the atom

- ¨Plum-Pudding¨

- Chocolate chip cookie model?

- Negative particles are the chocolate chips (Electrons)

-Rutherford

- NUCLEUS

- Very small, Very Dense, AND Positively Charged in the nucleus (came to this conclusion since the alpha particles are positively charged)

- Majority of the atom is empty. The Nucleus is VERY VERY VERY small…. BUT it is covered with electrons.

- Most of the mass is located in the nucleus.

-Bohr

- Mathematician

- Planetary Model

- Electrons in ¨orbits¨ around nucleus

- Not entirely accurate

-Modern

- WILL DISCUSS THIS LATER IN THE UNIT

NOTES #2

THE BOHR MODEL AND BEYOND

- Elaboration of the Bohr Model

- Einstein: Special Theory of Relativity

- Light is made of particles (packets of energy called photons)  in it's wave.

- Mass (matter) and energy are 2 sides of the same coin. ---> This idea led to the atomic bomb

Continuous Spectrum (rainbow). R(ed) O(range) Y(ellow) G(reen) B(lue) I(ndigo) V(iolet)

(Dark Side of the Moon album cover)

- R =  Long wavelengths (gimma)

- V = Short wavelengths

- The ones with the shorter wavelengths bend more

- Light from one element, and you put it through a prism, ---> you get a line spectrum (so you get certain, very specific, wavelength of light) with only a few wavelengths. WHY???

- Ex: Hydrogen

- We put on 3D glasses and looked at the light. We saw a spectrum.

- Bohr did the math

- ¨Ground state¨ closest to the nucleus.

- ¨Excited state¨ jumps farther away from nucleus

- Falls back to ¨ground state¨ and the energy releases light spectrum.

HOMEWORK

1.) “Light and Energy” worksheet - Due Monday (find in handouts)

2.) TWO Webassigns Due Sunday Night (we will complete both by Sunday and on Monday we will submit it a second time)