Search found 21 matches
- Wed Jun 13, 2018 10:44 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Dipole Moments
- Replies: 1
- Views: 335
Dipole Moments
So, to clarify, a dipole moment occurs when the electronegativities are unequal, which is polar and when the electronegativities even out, there is no dipole moment and the molecule is non polar. Correct?
- Wed Jun 13, 2018 6:08 pm
- Forum: Empirical & Molecular Formulas
- Topic: Test 1 Q4
- Replies: 1
- Views: 332
Test 1 Q4
Hi! Just going over the previous tests and I'm wondering how to do this problem. It states, "Naphthalene (C10H8) is a type of organic molecule called a polycyclic aromatic hydrocarbon (PAH) and it is a main component in petroleum gasoline. It has been proven to be toxic when burned to both the ...
- Tue May 29, 2018 5:27 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4.1
- Replies: 5
- Views: 627
Re: 4.1
So then if the shape is affected then there must be lone pairs and if it is not then there may be lone pairs?
- Tue May 29, 2018 5:04 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs
- Replies: 2
- Views: 346
Lone Pairs
I think I missed the lecture that this was covered, but how do lone pair electrons affect bond angles? Thanks!!:-)
- Tue May 22, 2018 8:46 pm
- Forum: Lewis Structures
- Topic: 3.51
- Replies: 2
- Views: 389
3.51
The question states: "Hypochlorous acid, HClO, is found in white blood cells, where it helps to destroy bacteria. Write two Lewis structures with different atom arrangements for HClO and select the most likely structure by identifying the structure with formal charges closest to zero. Consider ...
- Sun May 20, 2018 8:12 pm
- Forum: Ionic & Covalent Bonds
- Topic: 3.29
- Replies: 6
- Views: 757
Re: 3.29
Also what is the coulombs constant?
- Sun May 20, 2018 7:53 pm
- Forum: Ionic & Covalent Bonds
- Topic: 3.29
- Replies: 6
- Views: 757
Re: 3.29
How would we know what the distance between particles is in these types of problems? Would that be given?
- Wed May 16, 2018 3:51 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Lewis Structure [ENDORSED]
- Replies: 7
- Views: 918
Re: Lewis Structure [ENDORSED]
From what I have heard and what I have been doing, it really does not matter where you put the dots, just as long as you have the correct number of valence electrons.
- Wed May 16, 2018 3:32 pm
- Forum: Ionic & Covalent Bonds
- Topic: 3.23a & b
- Replies: 2
- Views: 366
3.23a & b
The question states: "Chlorine can exist in both positive and negative oxidation states. What is the maximum (a) positive and (b) negative oxidation number that chlorine can have?"
Can someone please explain this to me? Thank you!
Can someone please explain this to me? Thank you!
- Wed May 16, 2018 3:28 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarization and Solubiity
- Replies: 2
- Views: 670
Polarization and Solubiity
So just to clarify from lecture, the larger the atom, the more polarizable, and the less soluble it is, correct?
- Tue May 08, 2018 1:43 pm
- Forum: Trends in The Periodic Table
- Topic: 2.81
- Replies: 3
- Views: 482
2.81
The problem states: "Ionization energies usually increase on going from left to right across the periodic table. The ionization energy for oxygen, however, is lower than that of either nitrogen or fluorine. Explain this abnormality." Can someone please explain this to me? Also, should we k...
- Tue May 08, 2018 1:21 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 2.59
- Replies: 2
- Views: 407
2.59
The problem states: "Place the following ions in order of increasing ionic radius: S^2-, Cl^-, P^3-."
It says that the answer is P^3- > S^2- > Cl-. Can someone please explain to me why they do not have the same ionic radius? Thanks!
It says that the answer is P^3- > S^2- > Cl-. Can someone please explain to me why they do not have the same ionic radius? Thanks!
- Wed May 02, 2018 12:45 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: HOMEWORK PROBLEM 2.19
- Replies: 3
- Views: 1094
Re: HOMEWORK PROBLEM 2.19
For part a, wouldn't it be 0-6, as the range is from 0 - (n-1)
- Tue May 01, 2018 10:39 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: HW #1.43
- Replies: 8
- Views: 1275
Re: HW #1.43
Just a correction,
v=p/m
So it would be 1.507 x 10^-25 km/s / 9.109383 kgm/s
which gets you 1.65 x 10^5 m/s
v=p/m
So it would be 1.507 x 10^-25 km/s / 9.109383 kgm/s
which gets you 1.65 x 10^5 m/s
- Sun Apr 22, 2018 11:35 pm
- Forum: Properties of Light
- Topic: Test 2 Material
- Replies: 12
- Views: 1140
Test 2 Material
For the second test, will it be strictly new material or will we have problems based on the material from the first test as well?
- Mon Apr 16, 2018 4:42 pm
- Forum: Properties of Light
- Topic: HW 1.7 (using nm vs pm)
- Replies: 8
- Views: 730
Re: HW 1.7 (using nm vs pm)
In 1.7, the problem states that your answer for part (a) should be in nanometers and your answer for part (b) should be in picometers. So, to answer your question, it should say what unit it wants your answer to be in.
- Sun Apr 15, 2018 6:25 pm
- Forum: Photoelectric Effect
- Topic: Planck's Constant
- Replies: 4
- Views: 640
Planck's Constant
I know that Planck's constant is 6.626x10^-34, but what does that number actually represent?
- Sun Apr 15, 2018 5:46 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Atomic weight vs molecular weight
- Replies: 4
- Views: 869
Re: Atomic weight vs molecular weight
The atomic weight is the mass of one mole of an element, as seen on the periodic table. For example, the atomic weight of carbon is 12.011. The molecular weight is the sum of the atomic that make up a given compound. For instance, in order to take the molecular weight of CO2, we would add 12.011+2(1...
- Sun Apr 15, 2018 4:28 pm
- Forum: *Black Body Radiation
- Topic: What is a black body? [ENDORSED]
- Replies: 7
- Views: 1460
What is a black body? [ENDORSED]
Could someone explain to me what a black body actually is? Also, will we need to know anything about black bodies for future tests or should I just not worry about it?
- Sun Apr 15, 2018 4:01 pm
- Forum: Significant Figures
- Topic: Purpose of Sig Figs
- Replies: 2
- Views: 326
Purpose of Sig Figs
For the most part, I understand Sig Figs, but I don't really get why we use them. Why are they so important?
- Sun Apr 15, 2018 1:21 pm
- Forum: SI Units, Unit Conversions
- Topic: Chemical Formulas [ENDORSED]
- Replies: 11
- Views: 942
Re: Chemical Formulas [ENDORSED]
I'm sure we will be taught how to do this, but until then I don't think we have to worry about it.