Search found 21 matches

by Katie 1E
Sat Dec 09, 2017 2:24 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.89
Replies: 1
Views: 233

11.89

How do we know that there is a coefficient 2 in front of A in this question by looking at the graph?

Also, why are the values for the pressure in part b divided by a hundred? Thanks!
by Katie 1E
Fri Dec 08, 2017 12:45 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: 12.49
Replies: 1
Views: 123

12.49

Where is the answer key getting the numbers used in the answer key for question 49? I understand that the pKb for morphine, 5.79 is from a table earlier in the chapter, but I couldn't find the values used for BrO-. Also, why was pKb used as opposed to Kb?
by Katie 1E
Fri Dec 08, 2017 12:41 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Relationship between pka, ka, and acidity strength
Replies: 5
Views: 1213

Relationship between pka, ka, and acidity strength

What is the relationship between pka, ka, and acid strength and how do they relate to pkb, kb, and base strength?
by Katie 1E
Wed Dec 06, 2017 2:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculations using ice box
Replies: 4
Views: 203

Calculations using ice box

When you're using ice box and you are solving for the value of x and you get to the point where you have initial concentration minus x in the denominator of the equilibrium equation, how do you know when you can ignore the x? In what cases is the x negligible and how do you know? Sorry if this was c...
by Katie 1E
Wed Dec 06, 2017 2:46 pm
Forum: Hybridization
Topic: Delocalized pi bonds [ENDORSED]
Replies: 2
Views: 157

Delocalized pi bonds [ENDORSED]

Is a delocalized pi bond basically a hybridized bond, or in other words a double bond in a resonance structure that is hybridized over multiple bonds? What would be an example of a localized pi bond?
by Katie 1E
Tue Nov 28, 2017 12:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.19 b
Replies: 3
Views: 154

Re: 4.19 b

In the answer key they explain that the bond between Be and the Carbons on either side of it are considered sp and linear. However, the CH3 on either side of the Be are considered tetrahedral because it connects to Be on one end and H on the other three. So you were right, the Be of the atom is not ...
by Katie 1E
Tue Nov 28, 2017 12:54 pm
Forum: Hybridization
Topic: Hybridization and lone pairs
Replies: 3
Views: 169

Hybridization and lone pairs

Are lone pairs counted when considering hybridization?
by Katie 1E
Mon Nov 13, 2017 7:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron Density [ENDORSED]
Replies: 4
Views: 228

Re: Electron Density [ENDORSED]

It helps when determining the molecular shape, especially when using AXE notation
by Katie 1E
Mon Nov 13, 2017 2:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Correlation between polarity, stability, and cis- vs trans- molecules
Replies: 1
Views: 230

Correlation between polarity, stability, and cis- vs trans- molecules

In class today, Dr. Lavelle used cis-dichloroethane and trans-dichloroethane to show how the dipoles of a molecule can cancel to make a bond polar, or they can face the same direction and therefore make the molecule non-polar. My question is, is one of these molecules more stable or more favorable t...
by Katie 1E
Fri Nov 10, 2017 6:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron Density [ENDORSED]
Replies: 4
Views: 228

Re: Electron Density [ENDORSED]

I'm pretty sure that the bonded pairs count as regions of electron density as well. Although bonded regions may not repel each other as strongly as lone pairs do, they are still considered regions of electron density because electrons are likely to be present in this region.
by Katie 1E
Wed Nov 08, 2017 1:33 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron config of elements in 5d and 6d
Replies: 4
Views: 348

Electron config of elements in 5d and 6d

When counting the number of electrons in the d subshell of an element in 5d or 6d, do we count the square on the periodic table that has the f block as one or do we skip it? So for example, would Osmium be 5d5 or 5d6?
by Katie 1E
Mon Oct 30, 2017 10:17 pm
Forum: *Particle in a Box
Topic: Why can't a particle in a container have zero energy?
Replies: 2
Views: 780

Re: Why can't a particle in a container have zero energy?

I think it's also because the lowest possible energy level is n=1, which by default means that the electron has energy. Also, a particle with no energy means that it s completely motionless, which is impossible.
by Katie 1E
Mon Oct 30, 2017 10:13 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: H-Bar vs h
Replies: 2
Views: 260

H-Bar vs h

Can h-bar and h be used interchangeably when using the heisenberg equation and expect to get the same answer either way? The textbook and solution manual both use h-bar, but in class we always use planck's constant divided by 4pi.
by Katie 1E
Tue Oct 24, 2017 1:03 pm
Forum: Trends in The Periodic Table
Topic: Comparison of electron affinity of Nitrogen and Carbon
Replies: 2
Views: 314

Re: Comparison of electron affinity of Nitrogen and Carbon

The reason that nitrogen is more stable than carbon because it has one electron in px, one in py, and one in pz. Carbon has an empty pz, so it has a higher electron affinity because it needs one more electron in the p subshell to make it more stable.
by Katie 1E
Tue Oct 24, 2017 12:57 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Core vs Valence Electrons
Replies: 2
Views: 156

Re: Core vs Valence Electrons

When you say the "s" orbital is filled, are you referring to 1s or 2s? If you are referring to 1s, then yes, that is the core. If you are referring to 2s, then it is the valence. The core electrons are all the electrons that are not in the outer shell. This includes the last noble gas, as ...
by Katie 1E
Thu Oct 19, 2017 12:53 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: lines in electromagnetic spectrum
Replies: 3
Views: 205

Re: lines in electromagnetic spectrum

Usually in the diagram the lines would be labeled on the left side as n=1, n=2, etc. The number corresponds to the energy level that the electron is in or moving to/from. So, for example, if the electron jumps from the first line to the third line, then it is going from the first to the third energy...
by Katie 1E
Thu Oct 19, 2017 12:45 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: orbitals an shells [ENDORSED]
Replies: 5
Views: 369

Re: orbitals an shells [ENDORSED]

In this definition are you using the terms "shells" and "subshells" interchangeably? Or is there a difference between the two?
by Katie 1E
Sun Oct 15, 2017 12:50 pm
Forum: Photoelectric Effect
Topic: Constants that need to be memorized
Replies: 6
Views: 293

Re: Constants that need to be memorized

I don't think you need to memorize the equations or constants, but I think that you should be very familiar with how to use them and what types of questions to use them in.
by Katie 1E
Sun Oct 15, 2017 12:36 pm
Forum: Properties of Light
Topic: Photoelectric Experiments:Light [ENDORSED]
Replies: 4
Views: 246

Re: Photoelectric Experiments:Light [ENDORSED]

Most of the time it is UV light, but sometimes the energy is high enough in violet light, too.
by Katie 1E
Tue Oct 03, 2017 12:10 pm
Forum: Significant Figures
Topic: Number of sig figs in answer
Replies: 8
Views: 567

Re: Number of sig figs in answer

However, just because you're using 2 sig figs in your answer, that doesn't necessarily mean that you should use 2 sig figs during your calculations. Two sig figs isn't very precise, so during your calculations you may want to use three or four sig figs, then use only 2 sig figs only when giving your...
by Katie 1E
Tue Oct 03, 2017 12:04 pm
Forum: Molarity, Solutions, Dilutions
Topic: Volume in Liters [ENDORSED]
Replies: 2
Views: 287

Re: Volume in Liters [ENDORSED]

Even if you were solving for something other than molarity, if you were given the volume of something in mL you would always want to convert mL to L.

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