Search found 14 matches

by Matthew D 3F
Sat Nov 03, 2018 4:26 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodes and Nodal Planes
Replies: 1
Views: 132

Nodes and Nodal Planes

I'm having a bit of trouble with what these are and how they relate to the quantum numbers and wavefunction. Can someone please explain what these are?
by Matthew D 3F
Sat Nov 03, 2018 4:13 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ionization Energies
Replies: 4
Views: 67

Ionization Energies

Does it get progressively harder to remove electrons after the second (third, fourth, etc).
by Matthew D 3F
Sat Nov 03, 2018 4:09 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2.51 6th Edition
Replies: 1
Views: 35

2.51 6th Edition

How many unpaired electrons are predicted for the ground-state configuration of each of the following atoms:
(a) Bi; (b) Si; (c) Ta; (d) Ni?

What exactly is the question being asked here- is it just all the odd electrons in the outer p-shell?
by Matthew D 3F
Thu Oct 25, 2018 9:31 pm
Forum: Trends in The Periodic Table
Topic: CH 2 6TH EDITION 2.81
Replies: 2
Views: 78

Re: CH 2 6TH EDITION 2.81

This is because of the amount of electrons in the p-orbitals of oxygen. There are 4 of them, and it is the first element where the p electrons have to be paired. This causes some repulsion energy between the electrons, so the ionization energy becomes lower because it takes less work to remove an el...
by Matthew D 3F
Thu Oct 25, 2018 9:28 pm
Forum: Properties of Light
Topic: Degenerate orbitals
Replies: 2
Views: 103

Re: Degenerate orbitals

The book also says that the three p-orbitals in a shell are degenerate both in hydrogen and in many-electron atoms, so I'm sure that the book is correct.
by Matthew D 3F
Thu Oct 25, 2018 9:26 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Degeneracy
Replies: 6
Views: 139

Re: Degeneracy

Degeneracy entails the orbital of a shell all having the same energy.
by Matthew D 3F
Sat Oct 13, 2018 11:20 am
Forum: Properties of Light
Topic: 6th Edition Ch.1 #57
Replies: 1
Views: 34

Re: 6th Edition Ch.1 #57

The Balmer series shows that n1 = 2. The next line is the fifth line, so n2 should be 7. In order to find the frequency, use the Rydberg equation, which is R*((1/(n1)^2)-(1/(n2)^2)). From there you can use λ = c/v to find the wavelength.
by Matthew D 3F
Sat Oct 13, 2018 11:16 am
Forum: Properties of Electrons
Topic: Quantum Theory 1.25
Replies: 1
Views: 51

Re: Quantum Theory 1.25

To solve this problem, you get the equation E = hc/ λ. This comes from both E = hv and c = vλ. For part a, you just plug in the values, with λ being 589*10^9m
by Matthew D 3F
Sat Oct 13, 2018 11:11 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E 21 Sixth Edition
Replies: 1
Views: 185

Re: E 21 Sixth Edition

To find the N2 molecules, you divide the mass of N in the sample by the molar mass of N2 (28.02 g/mol) to find the moles of N2, then you multiply that by Avogadro's number.
by Matthew D 3F
Thu Oct 04, 2018 4:11 pm
Forum: Molarity, Solutions, Dilutions
Topic: Q E14
Replies: 2
Views: 59

Re: Q E14

You have to determine what the metal M is first. Then find the mass of its sulfide, which would be (Metal)S.
by Matthew D 3F
Thu Oct 04, 2018 4:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework Problems
Replies: 3
Views: 78

Re: Homework Problems

As long as you get 7 done, you should be fine.
by Matthew D 3F
Mon Oct 01, 2018 12:08 pm
Forum: Limiting Reactant Calculations
Topic: Limiting reagents
Replies: 12
Views: 181

Re: Limiting reagents

A two step chemical reaction can have two limiting reactants, one for each step, but a single step chemical reaction can only have one limiting reactant.
by Matthew D 3F
Wed May 23, 2018 10:57 am
Forum: Electronegativity
Topic: Question for Exams [ENDORSED]
Replies: 5
Views: 294

Question for Exams [ENDORSED]

Would we need to know exact electronegativity values, or just their general trends on the periodic table?
by Matthew D 3F
Wed May 23, 2018 10:53 am
Forum: Octet Exceptions
Topic: Octet Rule Exceptions
Replies: 1
Views: 139

Octet Rule Exceptions

Hello, can I get a quick refresher on the elements that are exceptions from the octet rule?

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