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: 467
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: 578
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: 500
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: 773
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: 553
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: 723
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: 1176
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?
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?
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: 430
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: 797
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: 490
Lewis Structures of Radicals [ENDORSED]
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: 325
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?
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: 325
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: 590
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
How about I 2-? Do we add 6s1 or 5d1?
I: [Kr] 4d10 5s2 5p5
I-: [Kr] 4d10 5s2 5p6
How about I 2-? Do we add 6s1 or 5d1?
- Tue Oct 24, 2017 11:51 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Ground State Scandium
- Replies: 3
- Views: 854
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: 869
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: 609
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: 421
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: 659
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: 659
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: 517
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: 1612
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.