## Search found 19 matches

Tue Mar 14, 2017 12:10 am
Forum: *Alkanes
Topic: Naming [ENDORSED]
Replies: 92
Views: 8846

### Re: Naming[ENDORSED]

Does using common names (for substituents like isopropyl, for example) make a difference in the use of dashes?
Tue Mar 14, 2017 12:08 am
Forum: *Ethers
Topic: Figuring out if it is an ether
Replies: 2
Views: 607

### Re: Figuring out if it is an ether

But if O is bonded to two carbons on the same ring, as if it were replacing a C in a cyclopropane, is it still considered an ether?
Sun Feb 26, 2017 3:05 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Winter 2013 Midterm #7: Which Nernst Equation to Use?
Replies: 2
Views: 308

### Re: Winter 2013 Midterm #7: Which Nernst Equation to Use?

The above poster is probably correct, but in lecture he said that log has to do with reactions where pH is a relevant value, as it is measured in terms of log.
Sun Feb 26, 2017 3:04 pm
Forum: Balancing Redox Reactions
Topic: Oxidation number of oxygen in O3
Replies: 3
Views: 5020

### Re: Oxidation number of oxygen in O3

What would the lewis structure of O3 be? Do the formal charges need to add up to the total charge?
Sun Feb 26, 2017 3:02 pm
Forum: Van't Hoff Equation
Topic: Final
Replies: 3
Views: 386

### Re: Final

This equation might be needed in order to find a given value that you need for a different equation, so you should probably be acquainted with it.
Sun Feb 26, 2017 3:01 pm
Forum: Calculating Work of Expansion
Topic: max amount of work
Replies: 4
Views: 391

### Re: max amount of work

Perfect systems would theoretically be reversible, meaning the reactions occuring within them would occur extremely slowly and with the maximum amounts of energy and work being done or used up. Real systems don't necessarily work that way.
Sun Feb 26, 2017 3:00 pm
Forum: Calculating Work of Expansion
Topic: Work Equations
Replies: 2
Views: 413

### Re: Work Equations

ln and log have to do with whether or not pH is being used (pH is measured in log) so it shouldn't be very necessary to use the log equation, but I don't think it gives a different answer.
Sun Feb 26, 2017 2:58 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Bond Enthalpies
Replies: 7
Views: 589

### Re: Bond Enthalpies

Reaction enthalpy describes the total net change in enthalpy that occurs after the reactants change and form products. Standard formation enthalpies describe the enthalpy required to create a given molecule from its atoms
Tue Jan 17, 2017 3:48 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Question 8.55
Replies: 1
Views: 292

### Re: Question 8.55

I would also love an answer to this.

Let me format the question appropriately:

3BaO + 2Al --> Al2O3 + 3Ba
Tue Jan 17, 2017 3:28 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Examples of adiabatic systems
Replies: 3
Views: 398

### Re: Examples of adiabatic systems

Aren't insulated systems necessarily isolated? Unless the insulated system is open, but that wouldn't make sense, because then heat transfer could occur, correct?
Sun Nov 13, 2016 4:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 2014 Workbook Quiz Question 8
Replies: 1
Views: 348

### 2014 Workbook Quiz Question 8

One of our questions on the quiz seems to want us to use a pure solid. However, having been told not to use that in an question what do I do for this question? Question 8 on Fall 2014 prep says: Considering NH4HS(s) <--> NH3(g) + H2S(g) If Kp is 0.11 at 300K, calculate the equilibrium partial pressu...
Sun Nov 13, 2016 4:52 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating K
Replies: 4
Views: 377

### Re: Calculating K

One of our questions on the quiz seems to want us to do this. Question 8 on Fall 2014 prep says: Considering NH 4 HS (s) <--> NH 3 (g) + H 2 S (g) If K p is 0.11 at 300K, calculate the equilibrium partial pressure of NH 3 (g) starting from pure NH 4 HS (s) .
Wed Nov 02, 2016 2:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Square Pyramidal
Replies: 2
Views: 434

### Square Pyramidal

So I have encountered varied answers to this question and want something final.

Does the square pyramidal shape (Ax5E) have bond angles of 90, 180, or LESS THAN 90 and 180?
Mon Oct 31, 2016 11:12 pm
Forum: Octet Exceptions
Topic: Lewis Acids and Bases
Replies: 3
Views: 603

### Lewis Acids and Bases

Hi, So I was wondering; if I have a compound with a central atom like Phosphorous, which can accept an expanded octet, how do I determine if it is a Lewis acid or base? If P has, say, 4 single bonds and a lone pair, would it like to donate that lone pair, making it a Lewis base? If P has a formal ch...
Sun Oct 30, 2016 8:29 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Minimum Indeterminacy [ENDORSED]
Replies: 6
Views: 996

### Re: Minimum Indeterminacy[ENDORSED]

In regards to why it's multiplied by 2. +-0.1 is only one arm of the indeterminancy factor. delta V refers to the both arms or sides of the indeterminancy so we must use 0.2 instead of 0.1 as velocity can either be =0.1 or -0.1. So do you mean that any value in the delta V must be multiplied by 2, ...
Fri Oct 21, 2016 10:51 pm
Forum: Lewis Structures
Topic: Connectivity of Atoms from Formula
Replies: 1
Views: 271

### Connectivity of Atoms from Formula

So, there are three different formulas I am aware of. There is the chemical/empirical formula, the ratio of atoms to eachother in a molecule (i.e. CH 4 O for methanol) The molecular formula , which represents the total number of atoms in a molecule, which happens to remain the same (CH 4 O) in metha...
Fri Oct 14, 2016 3:24 pm
Forum: Photoelectric Effect
Topic: Threshold Energy Question
Replies: 1
Views: 271

### Threshold Energy Question

Hi, So I am a bit perplexed by the following equation, which is apparently true in both instances: hv = threshold energy hv = threshold energy + 1/2mv^2 (1/2mv^2 = kinetic energy) In the first equation, the energy of what is being solved for? In the second equation, what energy is being solved for? ...
Fri Oct 07, 2016 7:48 pm
Forum: Photoelectric Effect
Topic: Stern and Gerlach Experiment [ENDORSED]
Replies: 2
Views: 425

### Re: Stern and Gerlach Experiment[ENDORSED]

So, I'm still not sure I know exactly what quantum spin entails. Is the electron literally spinning on an axis? What is is spinning "up" and "down relative to? Does it affect its motion around the atom or other electrons, and why exactly is it significant if not? Why can electron spin...
Wed Sep 28, 2016 7:35 pm
Forum: Balancing Chemical Reactions
Topic: Calculating Net Moles
Replies: 3
Views: 823

### Re: Calculating Net Moles

I wanted to follow up on this question; I too am hung up on one of the pre/post-assessment questions. It does not seem to be explained in the video module. Here is the question: 8. During a summer camping weekend 4 moles of butane (C4H10) gas were used for cooking. Chose the right balanced equation ...

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