Search found 32 matches

by Betty Wolkeba section 1L
Sun Jun 10, 2018 11:35 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: H+ Acidic and OH- Basic
Replies: 4
Views: 198

Re: H+ Acidic and OH- Basic

I think the main part we should know is that Lewis acids and bases are involved with electron lone pairs( whether you gain it for an acid or loose it for a base) whereas Bronsted acid and bases have to do with protons (which include H+ atoms) and whether you gain them for a base or donate them for a...
by Betty Wolkeba section 1L
Sun Jun 10, 2018 11:32 pm
Forum: Hybridization
Topic: pi bonds and sigma bonds [ENDORSED]
Replies: 4
Views: 219

Re: pi bonds and sigma bonds [ENDORSED]

Hi, I found a good link that might help
https://www.youtube.com/watch?v=YcSPPKESpwc

But i like to think of it as a sigma bond is a single bond, whereas a pi bond is the second or third bond of the ligand. This video goes more in depth about it. Hope that helps!
by Betty Wolkeba section 1L
Sun Jun 10, 2018 11:29 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs for Final
Replies: 8
Views: 344

Re: Sig Figs for Final

Sig figs will be taken into consideration on the final as it was on the midterm
by Betty Wolkeba section 1L
Sun Jun 10, 2018 11:27 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Valence Electron Configurations [ENDORSED]
Replies: 1
Views: 64

Valence Electron Configurations [ENDORSED]

Will we be expected on the final to know how to make the valence shell electron configurations? The ones with sigma bonds and such
by Betty Wolkeba section 1L
Sat Jun 09, 2018 9:47 pm
Forum: Ionic & Covalent Bonds
Topic: Finding Bond order
Replies: 2
Views: 134

Finding Bond order

How do we calculate the bond order ? And if possible can someone give an example?
by Betty Wolkeba section 1L
Wed Jun 06, 2018 1:17 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: How does size affect polarizing power/ polarizability
Replies: 3
Views: 264

Re: How does size affect polarizing power/ polarizability

The larger the size, the more polarizability it has because larger atoms are usually easier to remove electrons from. However, the larger the size, the less polarizing power it has I believe.
by Betty Wolkeba section 1L
Wed Jun 06, 2018 1:11 pm
Forum: Trends in The Periodic Table
Topic: Isoelectronic elements and their characteristics
Replies: 2
Views: 213

Re: Isoelectronic elements and their characteristics

Two elements being isoelectronic just mean that they have the same number of electrons and the same electron configurations. They can still have different characteristics. For example, K+ and Cl- are isoelectronic with Argon, however, Cl- is larger than K+ because K+ has more protons so it'll pull i...
by Betty Wolkeba section 1L
Mon Jun 04, 2018 10:32 pm
Forum: Dipole Moments
Topic: determining dipole moment
Replies: 3
Views: 219

Re: determining dipole moment

I like to look at the electronegativities of the atoms in the molecule to help. For example, with HCL, Cl is more negative than H so the covalent bond makes electrons to be pulled closer to the CL, making it more partial negative, and H as a result, a partial positive.
by Betty Wolkeba section 1L
Sun Jun 03, 2018 11:06 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO Theory
Replies: 1
Views: 183

MO Theory

Will this be a topic addressed on the final?
by Betty Wolkeba section 1L
Tue May 22, 2018 6:17 pm
Forum: Electronegativity
Topic: Electronegativity Caluclations
Replies: 4
Views: 242

Electronegativity Caluclations

Will we be given the electronegativity of elements of compounds to calculate their electronegative difference or will we be expected to estimate/memorize them?
by Betty Wolkeba section 1L
Sun May 20, 2018 5:22 pm
Forum: Ionic & Covalent Bonds
Topic: Which is more Ionic
Replies: 2
Views: 91

Which is more Ionic

I was doing a practice problem and it was asking which compound is more ionic, LiH or HCl, and I thought the correct answer would be HCl since H and Cl have a greater electronegative distance on the periodic table from each other than Li and H, however, according to the answer key, the correct answe...
by Betty Wolkeba section 1L
Sun May 20, 2018 2:39 pm
Forum: Lewis Structures
Topic: Lewis Structure of XeO2F2
Replies: 2
Views: 101

Re: Lewis Structure of XeO2F2

I believe because Xe is one of the exceptions to the rule that it must have an octet( any element that is after the second period / has an atomic number > 10), it can have as many bonds/electrons as it needs to satisfy the number of electrons in the compound. Both O and F have an atomic number less ...
by Betty Wolkeba section 1L
Sun May 20, 2018 2:28 pm
Forum: Octet Exceptions
Topic: 3.55
Replies: 1
Views: 93

Re: 3.55

You did 3.56 by accident I think. The BRO and BF4- are from the next problem
by Betty Wolkeba section 1L
Sat May 19, 2018 8:58 pm
Forum: Lewis Structures
Topic: Exception to Lewis Structure?
Replies: 4
Views: 131

Exception to Lewis Structure?

Can someone explain why Chlorine in this Lewis structure is allowed to break the octet rule and have more? Are there any other elements like Chlorine that might have this exception as well?
by Betty Wolkeba section 1L
Mon May 14, 2018 8:35 pm
Forum: Formal Charge and Oxidation Numbers
Topic: formal charge
Replies: 11
Views: 413

Re: formal charge

I like to think of it as the number of valence electrons minus the sum of how many electrons there are around it on the lewis sturcture (a bond=1 electron, a lone pair of electrons =2). The charge would be more negative if there are more electrons required to fill the octet than the number of valenc...
by Betty Wolkeba section 1L
Mon May 14, 2018 8:31 pm
Forum: Lewis Structures
Topic: HW 3.49.C
Replies: 1
Views: 67

Re: HW 3.49.C

The net overall charge is 0. The -1 from the C, and the +1 from the O cancel out to give you the overall net charge of the entire compound (-1+1=0). Hope that helps!
by Betty Wolkeba section 1L
Mon May 14, 2018 8:27 pm
Forum: Lewis Structures
Topic: BF3
Replies: 2
Views: 106

BF3

After todays's lecture where we learned that the element B doesnt need a full octet, does this rule apply to all the group 13 elements or just some specific ones, and if so, what are they?
by Betty Wolkeba section 1L
Sat May 12, 2018 2:03 pm
Forum: Ionic & Covalent Bonds
Topic: "1.20A or 1.40A"
Replies: 2
Views: 82

Re: "1.20A or 1.40A"

I dont think we've covered this yet so we dont have to worry about it now
by Betty Wolkeba section 1L
Sat May 12, 2018 1:29 pm
Forum: Resonance Structures
Topic: Resonance structure of benzene
Replies: 4
Views: 164

Re: Resonance structure of benzene

I attached an image of it, hope this helps!
by Betty Wolkeba section 1L
Sat May 12, 2018 1:20 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Calculating formal charges
Replies: 5
Views: 178

Calculating formal charges

Can someone explain how to calculate formal charges again? Or if there's another way aside from the equation we learned in class? And if we're trying to ionic element's lewis structure, do we had the charge to the number of electrons to the element/compound?
by Betty Wolkeba section 1L
Sat May 05, 2018 11:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions for Electron Configuartions
Replies: 5
Views: 190

Exceptions for Electron Configuartions

Can someone explain why specifically Chromium and Copper are exceptions? I know what their electron configurations are, but I was wondering why those two elements had different configurations?
by Betty Wolkeba section 1L
Sat May 05, 2018 11:09 pm
Forum: Photoelectric Effect
Topic: In class problem 5/4
Replies: 3
Views: 183

Re: In class problem 5/4

How would we know when to use the lamda=H*c/E or when to solve for the energy first?
by Betty Wolkeba section 1L
Sun Apr 22, 2018 11:39 pm
Forum: Properties of Light
Topic: Test 2 Material
Replies: 12
Views: 373

Re: Test 2 Material

Its everything up from chapter 1.1-1.5. None of the material covered on Friday's class will be on Test 2
by Betty Wolkeba section 1L
Sun Apr 22, 2018 11:03 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Memorizing spectrum
Replies: 5
Views: 152

Re: Memorizing spectrum

I remember in class he said we should have a basic knowledge of the the spectrum and the ranges. I dont think we'll have to go into too much depth such as knowing the different colors that coordinate to the ranges, but at least know what the ranges are for gamma rays, microwaves, uv rays, etc.
by Betty Wolkeba section 1L
Sun Apr 22, 2018 2:19 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: The Negative Sign in En = -hR/n^2
Replies: 5
Views: 148

Re: The Negative Sign in En = -hR/n^2

Why is it when we solve for the E in the Rydberg equation, we have to switch the sign from a negative to a positive when solving for another variable such as wavelength?
by Betty Wolkeba section 1L
Sun Apr 15, 2018 10:06 pm
Forum: Properties of Light
Topic: Wavelength and frequency proportions [ENDORSED]
Replies: 5
Views: 150

Wavelength and frequency proportions [ENDORSED]

Can someone clarify what Professor Lavelle was talking about in lecture about the wavelength and frequency relationships. For example, why is it when the frequency doubles, the wavelength halves? I'm still a little confused on this concept.
by Betty Wolkeba section 1L
Sun Apr 15, 2018 9:54 pm
Forum: Photoelectric Effect
Topic: When to use Planck's Constant [ENDORSED]
Replies: 5
Views: 188

Re: When to use Planck's Constant [ENDORSED]

Plank's constant is the amount of energy a photon carries with the frequency of its electromagnetic wave. We use it whenever we solve for the energy per photon (E= frequency x plank's constant)
by Betty Wolkeba section 1L
Sun Apr 15, 2018 9:38 pm
Forum: Empirical & Molecular Formulas
Topic: Finding Molecular X
Replies: 9
Views: 311

Re: Finding Molecular X

First I would solve for the number of moles produced for each product but break it down to C,H,O. Then divide each of the moles you got by the lowest number of moles produced. Then you would use those values for the empirical. To find the molecular formula, just divide the given molecular mass by th...
by Betty Wolkeba section 1L
Sun Apr 15, 2018 9:22 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Reactions
Replies: 5
Views: 234

Re: Balancing Chemical Reactions

Whenever one of the stoichiometric coefficients is a fraction, multiply the entire equation by the denominator. That would get rid of the fraction and multiply all the coefficients by a factor of the denominator.
by Betty Wolkeba section 1L
Sun Apr 15, 2018 8:48 pm
Forum: Empirical & Molecular Formulas
Topic: Finding Molecular X
Replies: 9
Views: 311

Re: Finding Molecular X

What do you mean by molecular compound? Are you talking about when they give us the name and not the compound? Because if thats the case, we havent learned how to form molecular compounds from names yet
by Betty Wolkeba section 1L
Sat Apr 07, 2018 4:04 pm
Forum: SI Units, Unit Conversions
Topic: Chemical Formulas [ENDORSED]
Replies: 11
Views: 398

Re: Chemical Formulas [ENDORSED]

Dr. Lavelle did say that he was going to provide us with the chemical formulas for now, however it probably wouldnt hurt brushing up on how to write chemical formulas for future references.
by Betty Wolkeba section 1L
Sat Apr 07, 2018 4:01 pm
Forum: Limiting Reactant Calculations
Topic: In-Class Limiting Reactant and Theoretical Yield Problem [ENDORSED]
Replies: 3
Views: 121

Re: In-Class Limiting Reactant and Theoretical Yield Problem [ENDORSED]

I believe that it would still be the same because essentially, the limiting reactant determines the maximum amount of how much a product would be produced. However, someone should reassert this.

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