Search found 12 matches

by William Cryer 1L
Sun Dec 03, 2017 2:16 pm
Forum: Hybridization
Topic: Clarification on hybridization
Replies: 3
Views: 181

Clarification on hybridization

Just to clarify, lone pairs are included as one area of electron density right? It's not just bonds, but also lone pairs that contribute to the type of hybridization?
by William Cryer 1L
Sun Dec 03, 2017 2:13 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE table question
Replies: 5
Views: 1833

ICE table question

I was wondering how we know if the "x" in the change row of the ICE table should be positive or negative? Will products always be positive and reactants always negative?
by William Cryer 1L
Sun Nov 19, 2017 10:47 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Order of Orbitals
Replies: 10
Views: 381

Re: Order of Orbitals

the easiest way I've found to write electron configurations is just go in order from left to right on the periodic table, starting at 1s1 and making your way across and down the periodic table. As long as you know the p and d blocks, this makes it super easy!
by William Cryer 1L
Sun Nov 19, 2017 10:41 am
Forum: Hybridization
Topic: Electron density question
Replies: 4
Views: 201

Electron density question

Do the lone pairs of electrons in an atom count as a region of electron density? That is, will it effect the type hybridization (sp, sp2, etc)?
by William Cryer 1L
Sun Nov 12, 2017 4:52 pm
Forum: DeBroglie Equation
Topic: De Broglie Equation [ENDORSED]
Replies: 4
Views: 277

Re: De Broglie Equation [ENDORSED]

You could use the equation as an initial step to find the energy of a photon. You're finding the wavelength, and you can plug that into an energy equation.
by William Cryer 1L
Sun Nov 12, 2017 4:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 3.9 and 3.11 in the homework? I am confused as to what it is they are asking
Replies: 3
Views: 188

Re: 3.9 and 3.11 in the homework? I am confused as to what it is they are asking

The way I think about this is counting backwards on the periodic. For example, if the electron configuration asks for a 3+, you know that this ion has 3 less electrons than normal, so you can count 3 elements to the right. Ex) N3+ turns into Be, so write the electron configuration as if you were wri...
by William Cryer 1L
Sun Oct 29, 2017 10:23 pm
Forum: Trends in The Periodic Table
Topic: Electron affinity versus ionization energy [ENDORSED]
Replies: 3
Views: 177

Electron affinity versus ionization energy [ENDORSED]

Are electron affinity and ionization energy the same thing? Or rather, do they have the same trend on the periodic table? How much an atom is attracted to electrons seems to me very closely related to its ionization energy. Could anyone clarify these two for me? Thanks.
by William Cryer 1L
Sun Oct 29, 2017 10:20 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Test #3 Material [ENDORSED]
Replies: 1
Views: 147

Re: Test #3 Material [ENDORSED]

We will not be tested on writing electron configurations for the f oribtal, only s, p, and d.
by William Cryer 1L
Sun Oct 15, 2017 4:50 pm
Forum: Properties of Light
Topic: Exercise 1.9 Sig Fig
Replies: 3
Views: 187

Re: Exercise 1.9 Sig Fig

I also believe that they want us to convert the wavelengths from nm to m, it's another way to practice. For example, you would have to do extra dimensional analysis to solve for energy, wavelength, and frequency since they are not the same units. Just a way to challenge our problem solving skills, I...
by William Cryer 1L
Sun Oct 15, 2017 4:41 pm
Forum: Einstein Equation
Topic: What is the difference between deltaE=hv and E=hv?
Replies: 5
Views: 2234

Re: What is the difference between deltaE=hv and E=hv?

We want to know where the hydrogen atom started (that is, which principle quantum level it was in). We need to know how much energy it gained or lost in order to get into the energy level, n=4. We would use deltaE=hv, as we need to know how much energy was used or lost in this process (the delta sym...
by William Cryer 1L
Thu Oct 05, 2017 5:55 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Units Usage
Replies: 3
Views: 213

Re: Formula Units Usage

In the book, its specifying formula units just as a generic unit. For example, in middle school or earlier math classes, if units were not specified, you would just put "units." Similarly, formula units could me molecules, atoms, etc., but for the purpose of these exercises, the unit is ju...
by William Cryer 1L
Thu Oct 05, 2017 1:28 pm
Forum: Molarity, Solutions, Dilutions
Topic: G5- moles of Na [ENDORSED]
Replies: 5
Views: 373

G5- moles of Na [ENDORSED]

In exercise G5 on the homework, I'm having trouble finding the moles of Na to solve the problem. Here's the problem: A student prepared a solution of sodium carbonate by adding 2.111 g of the solid to a 250.0-mL volumetric fl ask and adding water to the mark. Some of this solution was transferred to...

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