Class Notes (839,458)
United States (325,977)
Chemistry (249)
CHEM 111 (69)
Lecture

# Calculating energy, negative energy, particle-wave duality, electron waves

3 Pages
111 Views

Department
Chemistry
Course Code
CHEM 111
Professor
Dana Johnson

This preview shows page 1. Sign up to view the full 3 pages of the document.
Description
13 September Exam room – Clark A103 Announcements Exam Wednesday 9/15 Clark room, see board 7 -9 pm Pencil, calculator (without cover), and ID only at your desk Recitation Tuesday All sections open for exam review Check class schedule for other sections Recitation Thursdays Every hour from 8 to 3 in B202 Go over exam from Wed night Calculating energy Energy states: each orbit of the Bohr model has its own energy level associated with it Bohr’s equation: E = -2.18 x 10 -1J (Z / n )2 E = energy in joules Z = atomic number, charge on the nucleus N = # of the energy state (orbit) Energy of the ground state (n = 1) of hydrogen E = -2.18 x 10 -1(1 / 1 ) = -2.18 x 10 -18 J Negative energy Common theme in chemistry: atoms, molecules, reactions will always want to go to lower energy states Lower energy = more stable Higher energy = less stable Atom of zero J has an electron completely removed Electron close to the nucleus → most stable → least energy →most negative E ΔE can be calculated Change in energy (ΔE) = E final E initial ΔE = -2.18 x 10 -18(1 / n final– [-2.18 x 10 -18(1 / n initial -18 2 2 ΔE = -2.18 x 10 (1 / n final - 1 / n initial Can also be put in terms of λ and ν: Since: ΔE = hν = hc / λ -18 2 2 Then: ΔE = hν = hc / λ = -2.18 x 10 (1 / n final- 1 / n initial Clicker question An electron in the n = 5 level of a H atom emits a photon of wavelength 1281 nm. To
More Less

Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document

Unlock to view full version

Unlock Document
Me

OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Join to view

OR

By registering, I agree to the Terms and Privacy Policies
Just a few more details

So we can recommend you notes for your school.