## Search found 22 matches

Fri Dec 08, 2017 8:01 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 12.55/57
Replies: 2
Views: 276

### Re: 12.55/57

You need to use the ice table to find the concentrations of H+ and OH- to find the pH or pOH.
Fri Dec 08, 2017 7:49 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH vs pOH
Replies: 2
Views: 351

### Re: pH vs pOH

pH measures how acidic a solution is while pOH measures how basic a solution is. Both are calculated by taking the negative log of the concentration. pH + pOH = 14 should be used when moving from pH to pOH or vice versa.
Tue Dec 05, 2017 11:31 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Pka and Pkb values
Replies: 2
Views: 291

### Pka and Pkb values

Will we be given a table of Pka and Pkb values for the final?
Sun Dec 03, 2017 11:19 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Order
Replies: 4
Views: 524

### Re: Bond Order

It's the bond per atom. Number of bonds from the central atom divided by the number of atoms bonded to the central atom.
Sun Dec 03, 2017 8:33 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Overall Equations vs. Ionic Equations vs. Net Ionic Equations
Replies: 2
Views: 295

### Re: Overall Equations vs. Ionic Equations vs. Net Ionic Equations

Ionic equations indicate all dissociated ions in a chemical reaction while net ionic equations cancels out ions in both sides of a chemical reaction.
Sun Nov 26, 2017 11:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.9 Problem
Replies: 4
Views: 363

### Re: 4.9 Problem

Because there are five regions of electron density (three bonded atoms and two lone pairs), the electron geometry for ICL 3 is trigonal bipyramidal. Since there are two lone pairs, it takes the positions on the equatorial axis instead of the axial axis (which is where your confusion occurs). Hence, ...
Sun Nov 26, 2017 10:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: CH2Cl2 polarity
Replies: 2
Views: 530

### CH2Cl2 polarity

I understand that polar molecules are non-symmetric and nonpolar molecules are.

On question 25 part a, for CH2Cl2, the Lewis structure shows a symmetric configuration (or nonpolar), but in the solutions manual, it says it is polar. Why is this the case?
Sun Nov 19, 2017 6:59 pm
Forum: Naming
Topic: Naming
Replies: 5
Views: 387

### Re: Naming

It's based off of the Latin word ferrum meaning iron.
Sun Nov 19, 2017 1:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: All bond angles
Replies: 3
Views: 267

### Re: All bond angles

Absolutely you should. Knowing the bond angles will allow you to easily memorize certain shapes of molecules.
Sun Nov 12, 2017 4:16 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Calculating Formal Charge
Replies: 4
Views: 419

### Calculating Formal Charge

Is there a faster way of calculating formal charge other than the equation V-(L+(s/2))?
Sun Nov 12, 2017 3:04 pm
Forum: Lewis Structures
Topic: Lewis Structures of Radicals [ENDORSED]
Replies: 2
Views: 259

When making a Lewis Structure of a radical, how would I know which atom I would put the free electron?
Wed Nov 01, 2017 7:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Problem 2.54 part d
Replies: 2
Views: 213

### Re: Problem 2.54 part d

I'm sorry, I mistyped the wrong problem. It was 2.45 part d and the question asked which elements are predicted to have the following ground-state electron configurations: [Rn]7s2 6d2.

Also, is it incorrect to put 6d2 in front of 7s2?
Wed Nov 01, 2017 1:19 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Problem 2.54 part d
Replies: 2
Views: 213

### Problem 2.54 part d

For problem 2.54 part d, how come [Rn]7s2 6d2 is Thorium and not Rutherfordium? Isn't Thorium in the f block?
Wed Oct 25, 2017 12:23 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Anion electron configuration [ENDORSED]
Replies: 3
Views: 309

### Anion electron configuration[ENDORSED]

What is the electron configuration if you run out of orbitals from adding electrons? For example, say you have iodine.

I: [Kr] 4d10 5s2 5p5
I-: [Kr] 4d10 5s2 5p6

Tue Oct 24, 2017 11:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ground State Scandium
Replies: 3
Views: 442

### Ground State Scandium

In lecture, Dr. Lavelle said that the ground state of scandium is Sc: [Ar] 3d1 4s2, and not Sc: [Ar] 4s2 3d1. Why is it this order?
Sun Oct 22, 2017 1:08 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: expected electron configuration of chromium [ENDORSED]
Replies: 3
Views: 405

### expected electron configuration of chromium[ENDORSED]

Why is the expected electron configuration for chromium different from the observed electron configuration? The expected configuration is [Ar]4s2,3d4 and the observed configuration is [Ar]4s1,3d5.
Fri Oct 20, 2017 10:34 pm
Forum: Properties of Electrons
Topic: Ending Frequency [ENDORSED]
Replies: 3
Views: 415

### Re: Ending Frequency[ENDORSED]

Can you elaborate on your question ? Emitted electron equation doesn't usually give energy.
Fri Oct 13, 2017 11:30 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Pre-assessment atomic spectra number 35 [ENDORSED]
Replies: 2
Views: 257

### Re: Pre-assessment atomic spectra number 35[ENDORSED]

Use Rydberg's formula where the smaller number is n1 and the larger number is n2. In this case, n1 = 2 and n2 = 4.
Fri Oct 13, 2017 11:24 pm
Forum: Einstein Equation
Topic: Ek = 1/2 me v^2
Replies: 3
Views: 380

### Re: Ek = 1/2 me v^2

In this case me will always be 9.109 x 10^-31 kg because me is mass of electron. But the mass of other particles can be used in this place e.g. mp or mn for mass of proton or neutron respectively.
Fri Oct 13, 2017 11:18 pm
Forum: Einstein Equation
Topic: Ek = 1/2 me v^2
Replies: 3
Views: 380

### Re: Ek = 1/2 me v^2

In this case me will always be 9.109 x 10^-31 kg because me is mass of electron. But the mass of other particles can be used in this place e.g. mp or mn for mass of proton or neutron respectively.
Sat Oct 07, 2017 9:19 pm
Forum: Balancing Chemical Reactions
Topic: Determining order of elements to work with when balancing equations [ENDORSED]
Replies: 2
Views: 319

### Re: Determining order of elements to work with when balancing equations[ENDORSED]

No, starting with the least prominent elements is only a suggested route to balance chemical equations.
Fri Oct 06, 2017 12:43 pm
Forum: Significant Figures
Topic: Sig Fig in final answer [ENDORSED]
Replies: 3
Views: 642

### Re: Sig Fig in final answer[ENDORSED]

In this case, you should use 2 sig figs. When you are given different numbers of sig figs you should use the one with the least amount.