Search found 21 matches

by Andrew Berard 1F
Wed Jun 13, 2018 10:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Dipole Moments
Replies: 1
Views: 160

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?
by Andrew Berard 1F
Wed Jun 13, 2018 6:08 pm
Forum: Empirical & Molecular Formulas
Topic: Test 1 Q4
Replies: 1
Views: 148

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 ...
by Andrew Berard 1F
Tue May 29, 2018 5:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.1
Replies: 5
Views: 163

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?
by Andrew Berard 1F
Tue May 29, 2018 5:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 2
Views: 77

Lone Pairs

I think I missed the lecture that this was covered, but how do lone pair electrons affect bond angles? Thanks!!:-)
by Andrew Berard 1F
Tue May 22, 2018 8:46 pm
Forum: Lewis Structures
Topic: 3.51
Replies: 2
Views: 85

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 ...
by Andrew Berard 1F
Sun May 20, 2018 8:12 pm
Forum: Ionic & Covalent Bonds
Topic: 3.29
Replies: 6
Views: 207

Re: 3.29

Also what is the coulombs constant?
by Andrew Berard 1F
Sun May 20, 2018 7:53 pm
Forum: Ionic & Covalent Bonds
Topic: 3.29
Replies: 6
Views: 207

Re: 3.29

How would we know what the distance between particles is in these types of problems? Would that be given?
by Andrew Berard 1F
Wed May 16, 2018 3:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Lewis Structure [ENDORSED]
Replies: 7
Views: 246

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.
by Andrew Berard 1F
Wed May 16, 2018 3:32 pm
Forum: Ionic & Covalent Bonds
Topic: 3.23a & b
Replies: 2
Views: 89

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!
by Andrew Berard 1F
Wed May 16, 2018 3:28 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarization and Solubiity
Replies: 2
Views: 133

Polarization and Solubiity

So just to clarify from lecture, the larger the atom, the more polarizable, and the less soluble it is, correct?
by Andrew Berard 1F
Tue May 08, 2018 1:43 pm
Forum: Trends in The Periodic Table
Topic: 2.81
Replies: 3
Views: 173

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...
by Andrew Berard 1F
Tue May 08, 2018 1:21 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.59
Replies: 2
Views: 134

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!
by Andrew Berard 1F
Wed May 02, 2018 12:45 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HOMEWORK PROBLEM 2.19
Replies: 3
Views: 132

Re: HOMEWORK PROBLEM 2.19

For part a, wouldn't it be 0-6, as the range is from 0 - (n-1)
by Andrew Berard 1F
Tue May 01, 2018 10:39 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: HW #1.43
Replies: 8
Views: 414

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
by Andrew Berard 1F
Sun Apr 22, 2018 11:35 pm
Forum: Properties of Light
Topic: Test 2 Material
Replies: 12
Views: 371

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?
by Andrew Berard 1F
Mon Apr 16, 2018 4:42 pm
Forum: Properties of Light
Topic: HW 1.7 (using nm vs pm)
Replies: 8
Views: 246

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.
by Andrew Berard 1F
Sun Apr 15, 2018 6:25 pm
Forum: Photoelectric Effect
Topic: Planck's Constant
Replies: 4
Views: 199

Planck's Constant

I know that Planck's constant is 6.626x10^-34, but what does that number actually represent?
by Andrew Berard 1F
Sun Apr 15, 2018 5:46 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Atomic weight vs molecular weight
Replies: 4
Views: 256

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...
by Andrew Berard 1F
Sun Apr 15, 2018 4:28 pm
Forum: *Black Body Radiation
Topic: What is a black body? [ENDORSED]
Replies: 7
Views: 658

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?
by Andrew Berard 1F
Sun Apr 15, 2018 4:01 pm
Forum: Significant Figures
Topic: Purpose of Sig Figs
Replies: 2
Views: 142

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?
by Andrew Berard 1F
Sun Apr 15, 2018 1:21 pm
Forum: SI Units, Unit Conversions
Topic: Chemical Formulas [ENDORSED]
Replies: 11
Views: 398

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.

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