Search found 35 matches

by Megan Potter 1G
Sat Jun 09, 2018 10:38 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Porphyrin Ligand
Replies: 4
Views: 199

Porphyrin Ligand

What is a porphyrin ligand? (ex. would come from 19-23 of Lyndon's french toast test)
by Megan Potter 1G
Sat Jun 09, 2018 10:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shape of AX5E
Replies: 5
Views: 309

Shape of AX5E

I know AX5E means 6 total regions of electron density, so an octahedral electron arrangement. However, one of the bonds is a lone pair, leaving 5 bonds from the central atom to other atoms. This would make a square pyramidal, which makes sense, but I was under the impression that a lone pair deflect...
by Megan Potter 1G
Thu Jun 07, 2018 5:43 pm
Forum: Hybridization
Topic: Hybrid Orbitals
Replies: 3
Views: 188

Re: Hybrid Orbitals

He also said he preferred the s to do first and my TA writes it that way as well so you prob won't get points taken off either way
by Megan Potter 1G
Thu Jun 07, 2018 5:40 pm
Forum: Hybridization
Topic: Composition of a bond (Sigma and Pi Bonds)
Replies: 3
Views: 198

Composition of a bond (Sigma and Pi Bonds)

When we label sigma and pi bonds, like for CH4, I know looking at one of those C-H would be σ(C2sp^3, H1S). I was just wondering what the 2 for C and 1 for H referred to? is it just the row number?
by Megan Potter 1G
Tue Jun 05, 2018 10:58 pm
Forum: Lewis Acids & Bases
Topic: Conjugate Acids and Bases
Replies: 4
Views: 149

Conjugate Acids and Bases

What are conjugate acids and bases?
by Megan Potter 1G
Tue Jun 05, 2018 9:28 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: 12.49 Determining Base Strength
Replies: 4
Views: 508

Re: 12.49 Determining Base Strength

Megan Potter 1G wrote:12.49) Which is the stronger base, the hypobromite ion, BrO-, or morphine, C17H19O3N? Justify

Can someone explain what makes one base stronger than another?


just to add, the solutions manual says "the smaller the pKb (b is a subscript) of a base, the stronger the base". what is pKb?
by Megan Potter 1G
Tue Jun 05, 2018 9:24 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: 12.49 Determining Base Strength
Replies: 4
Views: 508

12.49 Determining Base Strength

12.49) Which is the stronger base, the hypobromite ion, BrO-, or morphine, C17H19O3N? Justify

Can someone explain what makes one base stronger than another?
by Megan Potter 1G
Wed May 23, 2018 2:09 pm
Forum: Octet Exceptions
Topic: Exoanding
Replies: 1
Views: 162

Re: Exoanding

So any atom in row 3 or greater can have an expanded octet. If you think back to when we did s, p, d, f stuff, having an n = 2 (row 2) would give us an l = 0, 1, which are the s and p orbitals. However, when we go to n = 3, l = 0, 1, 2 which are the s, p, and d orbitals. Now we can have an expanded ...
by Megan Potter 1G
Wed May 23, 2018 2:05 pm
Forum: Resonance Structures
Topic: 3.47
Replies: 3
Views: 253

Re: 3.47

Also drawing this molecule in a line would result in formal charges not equal to zero so the only way to draw it while minimizing the formal charges on the atoms would to draw it as a square
by Megan Potter 1G
Wed May 23, 2018 2:02 pm
Forum: Resonance Structures
Topic: Ionic character
Replies: 3
Views: 295

Re: Ionic character

Ionic character is relative to another atom, so not all small atoms may have ionic character. Like O2 is a fairly small atom (according to the trends), but because it's bonded with another O (that has the same electronegativity) then it's covalent because they are sharing equally. Same with if you h...
by Megan Potter 1G
Thu May 17, 2018 9:35 pm
Forum: Lewis Structures
Topic: 3.41 c [ENDORSED]
Replies: 4
Views: 167

Re: 3.41 c [ENDORSED]

those are the same thing, it doesn't really matter whether you put the line connecting to the oxygen below or to the side because its still between the C and H
by Megan Potter 1G
Tue May 15, 2018 9:06 pm
Forum: Lewis Structures
Topic: formal charge on central atom
Replies: 3
Views: 161

formal charge on central atom

is there some rule that states the formal charge on the central atom should be zero? like if you have to have atoms within a molecule with a +1 and -1 to make the overall charge 0, is there a rule that states the central atom should have a formal charge of 0 and the other atoms should be the ones wi...
by Megan Potter 1G
Tue May 15, 2018 9:04 pm
Forum: Lewis Structures
Topic: Which atom to have the charge in lewis structures
Replies: 2
Views: 110

Which atom to have the charge in lewis structures

So in a UA session, we learned when you are writing the Lewis structure for a molecule that has a charge, the most electronegative atom should carry the negative charge. for example, in OCN-, Oxygen is the most electronegative. When drawing the structure, one of the atoms needs to have a -1 to make ...
by Megan Potter 1G
Mon May 07, 2018 11:21 am
Forum: Trends in The Periodic Table
Topic: Ionization Energy (2.61) [ENDORSED]
Replies: 2
Views: 146

Ionization Energy (2.61) [ENDORSED]

2.1 is just an example, but the question is "Which member of each pair has the smaller first ionization energy?"
a) Ca or Mg?
b) Mg or Na?
c) Al or Na?

Can someone explain to me what ionization energy is and what it means to have a smaller FIRST ionization energy?
by Megan Potter 1G
Sun May 06, 2018 7:44 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm Topics [ENDORSED]
Replies: 33
Views: 1917

Re: Midterm Topics [ENDORSED]

How far in the periodic table do we need to know for electron configuration stuff? To krypton (so 3d, 4s, 4p)?
by Megan Potter 1G
Sun May 06, 2018 7:30 pm
Forum: Quantum Numbers and The H-Atom
Topic: 2.29 b & d
Replies: 3
Views: 162

Re: 2.29 b & d

so if ml is -1, then that means 2 electrons because the ml is specified? whereas with 2p, for example, the n=2 and l=1, which gives ml=-1, 0, +1 and each of those could have 2 electrons, right? which then ties in with why the p-orbital fills with 6 electrons? If someone could confirm this or explain...
by Megan Potter 1G
Sun May 06, 2018 7:06 pm
Forum: Quantum Numbers and The H-Atom
Topic: 2.29 b & d
Replies: 3
Views: 162

2.29 b & d

How many electrons can have the following quantum numbers in an atom: b) n=4, l=2, ml=-2 d) n=3, l=2, ml=+1 So for these I understand (using b for example) n=4 and l=2 would be the 4d orbital, and the values of ml could be -2, -1, 0, +1, and +2 (so 5 orbitals). I'm confused though on what exactly ml...
by Megan Potter 1G
Thu May 03, 2018 10:32 pm
Forum: Properties of Light
Topic: Test #2: Q6 [ENDORSED]
Replies: 10
Views: 540

Re: Test #2: Q6 [ENDORSED]

I also used wavelength=hc/E, but the way you do it works too. With rounding the answer is 10 x 10^7 (positive exponent of 7, not negative, because there's 10^9 nanometers in one meter) If you don't mind explaining more, just so I can possibly understand, why would 10^9 nanometers in one meter make ...
by Megan Potter 1G
Thu May 03, 2018 10:31 pm
Forum: Properties of Light
Topic: Test #2: Q6 [ENDORSED]
Replies: 10
Views: 540

Re: Test #2: Q6 [ENDORSED]

So if you solve the equation you get this: Wavelength = {(6.626 x 10^-34)(2.998 x 10^8)}/(1.99 x 10^-24) wavelength = .099821 meters there are 10^9 nanometers in one meter (nanometers are smaller so it makes sense that there should be a ton of them to make one meter) using dimensional analysis to co...
by Megan Potter 1G
Thu May 03, 2018 10:23 pm
Forum: Properties of Electrons
Topic: Electron Affinity
Replies: 4
Views: 283

Electron Affinity

what is electron affinity? like for the question: Which has a higher electron affinity - Chlorine (Cl) or Neon (Ne)?
by Megan Potter 1G
Wed May 02, 2018 6:15 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.21
Replies: 2
Views: 97

2.21

"What are the principal and orbital angular momentum quantum numbers for each of the following orbitals:
a) 6p
b) 3d
c) 2p
d) 5f
"

I said n= 6, 3, 2, and 5 in that order for the principal quantum numbers. How would you find the angular momentums? is that l?
by Megan Potter 1G
Wed May 02, 2018 6:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.19 part d
Replies: 2
Views: 91

2.19 part d

D states: how many subshells are there in the shell with n=4?

I was under the assumption that n described the size and energy of the orbital. Can someone explain how this correlates with subshells so how you would know the number of subshells with n=4? I'm lost
by Megan Potter 1G
Sun Apr 29, 2018 4:16 pm
Forum: Quantum Numbers and The H-Atom
Topic: quantum numbers [ENDORSED]
Replies: 3
Views: 173

Re: quantum numbers [ENDORSED]

In a simple way, any electron in an atom can be described by four quantum numbers (s, m, l, n) which help you find the electron. n is the energy level of the shell, l tells you the type of orbital, m tells you which of the l orbitals you are in, and s sort of tells you the direction of the spin of t...
by Megan Potter 1G
Sun Apr 29, 2018 4:11 pm
Forum: Properties of Light
Topic: Homework question 1.27 [ENDORSED]
Replies: 3
Views: 129

Re: Homework question 1.27 [ENDORSED]

And to find the number of photons, use the equation E=hc/wavelength. then take the total Energy (64J) and divide that by the Energy you just found (which is J/photon --> 473x10^-19) to get the number of photons which is 1.35x10^20 photons.
by Megan Potter 1G
Sun Apr 29, 2018 4:04 pm
Forum: Properties of Light
Topic: Test #2: Q6 [ENDORSED]
Replies: 10
Views: 540

Re: Test #2: Q6 [ENDORSED]

I also used wavelength=hc/E, but the way you do it works too. With rounding the answer is 10 x 10^7 (positive exponent of 7, not negative, because there's 10^9 nanometers in one meter)
by Megan Potter 1G
Tue Apr 17, 2018 6:15 pm
Forum: DeBroglie Equation
Topic: HW 1.39 [ENDORSED]
Replies: 8
Views: 379

HW 1.39 [ENDORSED]

Not sure which topic to put this under:

39) A baseball must weigh between 5.00 and 5.25 ounces (1 ounce 28.3 g). What is the wavelength of a 5.15-ounce baseball thrown at 92 mph?

How would you go about solving something like this? Not sure which equation I should be using.
by Megan Potter 1G
Tue Apr 17, 2018 5:31 pm
Forum: Photoelectric Effect
Topic: Example 1.5 [ENDORSED]
Replies: 8
Views: 278

Re: Example 1.5 [ENDORSED]

The formula for kinetic energy is E = mv 2 /2. m is the mass of the moving object (electron is being emitted; so electron mass) and v is the velocity of that moving object. mass of electron is the one you have stated. I'm still confused on this too. so is 9.109x10^-31 always going to be the mass of...
by Megan Potter 1G
Tue Apr 17, 2018 4:57 pm
Forum: Properties of Light
Topic: 1.13 (b)
Replies: 6
Views: 221

Re: 1.13 (b)

oops I just mistyped in my question. I got 4.86 x 10^-7 not 17. thanks!
by Megan Potter 1G
Mon Apr 16, 2018 8:56 pm
Forum: Properties of Light
Topic: 1.13 (b)
Replies: 6
Views: 221

1.13 (b)

Use the Rydberg formula for atomic hydrogen to calculate the wavelength of radiation generated by the transition from n=4 to n=2. (b) What is the name given to the spectroscopic series to which this transition belongs? (c) Use Table 1.1 to determine the region of the spectrum in which the transition...
by Megan Potter 1G
Sun Apr 15, 2018 8:36 pm
Forum: Properties of Light
Topic: Calculating the energy of a photon [ENDORSED]
Replies: 2
Views: 121

Re: Calculating the energy of a photon [ENDORSED]

h is just Planck's constant which is 6.626x10^-34 and v is your frequency
by Megan Potter 1G
Sun Apr 15, 2018 8:33 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Confusion about Atomic Spectroscopy [ENDORSED]
Replies: 3
Views: 173

Re: Confusion about Atomic Spectroscopy [ENDORSED]

Atomic spectroscopy is the study of electromagnetic radiation absorbed and emitted by atoms. Different atoms have different spectrums (or spectra might be the plural idk) so when you analyze them you can determine the elemental compositions.
by Megan Potter 1G
Tue Apr 10, 2018 4:18 pm
Forum: Molarity, Solutions, Dilutions
Topic: G.11 / Volumes for Solutions
Replies: 2
Views: 101

G.11 / Volumes for Solutions

So an example of this came up in G 11: A medical researcher investigating the properties of intravenous solutions prepared a solution containing 0.278 m C6H12O6 (glucose). What volume of solution should the researcher use to provide 4.50 mmol C6H12O6? For this problem I understand that 0.278 is my M...
by Megan Potter 1G
Sun Apr 08, 2018 8:46 pm
Forum: Limiting Reactant Calculations
Topic: M11 HW
Replies: 4
Views: 215

Re: M11 HW

The solutions manual has a solution for part (a) when it asks you to find the limiting reactant so definitely do the calculations.
by Megan Potter 1G
Fri Apr 06, 2018 1:43 pm
Forum: Balancing Chemical Reactions
Topic: Common Compounds to know
Replies: 3
Views: 207

Re: Common Compounds to know

Definitely check with a TA but from talking to other students who took 14A with Lavelle in the past they said we don't need to know those compounds yet and we will have a whole unit on all that stuff.
by Megan Potter 1G
Fri Apr 06, 2018 1:37 pm
Forum: Empirical & Molecular Formulas
Topic: Which mass of Hydrogen should I use?
Replies: 3
Views: 151

Re: Which mass of Hydrogen should I use?

My TA said that sig figs wouldn't cause a loss in points this quarter. She said in the past students had to watch them and then people ended up focusing more on sig figs and rounding correctly than doing the problem right in the amount of time given. She recommends if you are using a calculator keep...

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