Search found 20 matches

by Sydney Eskew 1H
Fri Mar 11, 2016 12:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Idean's Review
Replies: 2
Views: 749

Re: Idean's Review

That post of his was from 2015 so I think there is another packet but he hasn't posted it yet. Its helpful for sure, but I think he has another version with more info.
by Sydney Eskew 1H
Fri Mar 11, 2016 12:19 am
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Community Points
Replies: 11
Views: 1201

Re: Chemistry Community Points

It is on a weekly basis, so it doesn't matter how many times you post in a week, but the consistency of posting each week. If you didn't post one week, you wont get the point for that weeks online discussion. Sorry :(
by Sydney Eskew 1H
Wed Mar 02, 2016 4:19 pm
Forum: *Alkanes
Topic: quiz 3 prep 1 #2
Replies: 2
Views: 275

Re: quiz 3 prep 1 #2

I hope this helps! the (CH2CH3) is the ethyl.
by Sydney Eskew 1H
Thu Feb 25, 2016 4:44 pm
Forum: *Alkenes
Topic: Naming Alkenes
Replies: 1
Views: 300

Re: Naming Alkenes

I believe that yes, you want the lowest numbers, but that you want the lowest number for the main chain. In your problem, 2-pentene is preferred over 3-pentene. If there were no coefficients in from of the main chain, then you would be correct in wanting the lower numbers for the substituents. Does ...
by Sydney Eskew 1H
Wed Feb 17, 2016 2:08 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: chapter 15 hw
Replies: 1
Views: 277

Re: chapter 15 hw

I believe we should stop at problem 55
by Sydney Eskew 1H
Sun Feb 07, 2016 9:59 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Picture
Replies: 1
Views: 213

Picture

Usually the galvanic cell is drawn or given with the oxidation given first and the reduction second. How would the problem change if it was switched and reduction was given first then the oxidation?
by Sydney Eskew 1H
Wed Jan 27, 2016 6:44 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Delta S equations
Replies: 2
Views: 935

Re: Delta S equations

Above, the equation should read P1/P2 instead of P2/P1 for delta S because pressure and volume are inversely related.
by Sydney Eskew 1H
Sat Jan 23, 2016 1:08 pm
Forum: Phase Changes & Related Calculations
Topic: Converting
Replies: 2
Views: 268

Converting

In the question 8.9 it asks you to solve for internal energy and to do so we need to solve for work. We get the answer(for work) in liters x atm. Do we need to memorize the conversion from that to Joules or will we be given those conversion factors? It is similar to converting Torr to atm. Thanks.
by Sydney Eskew 1H
Sat Jan 16, 2016 7:30 pm
Forum: Phase Changes & Related Calculations
Topic: Steam Burns vs. Water Burns
Replies: 6
Views: 3094

Re: Steam Burns vs. Water Burns

Steam has more energy than water does. Boiling water is about 5KJ of heat while steam is about 40.7 KJ. So when the steam hits your skin you are immediately feeling 40.5 KJ of heat rather than 5KJ. Steam also absorbs heat so it will also increase in temperature.
by Sydney Eskew 1H
Thu Jan 07, 2016 2:12 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess' Law Homework 8.57
Replies: 1
Views: 337

Hess' Law Homework 8.57

When it asks to determine the reaction enthalpy, I thought delta H is always in kJ but the solution has kJ/mol. I thought that moles cancel out and that we are just left with kJ. Can someone explain why it could be left in kJ/mol and what the difference between the two answers is?
by Sydney Eskew 1H
Sat Nov 28, 2015 5:44 pm
Forum: Naming
Topic: Naming Coordination Compounds
Replies: 2
Views: 378

Re: Naming Coordination Compounds

This is a video on how to write coordination compounds when given the name and when given the formula.

IMG_0481.m4v [ 215.63 MiB | Viewed 377 times ]

by Sydney Eskew 1H
Sat Nov 28, 2015 5:25 pm
Forum: Naming
Topic: Naming Coordination Compounds
Replies: 2
Views: 378

Naming Coordination Compounds

This is a video to help with naming coordination compounds. Using ligand names, prefixes and oxidation numbers to help with naming from formula to name and from name to formula.
by Sydney Eskew 1H
Thu Nov 26, 2015 7:22 pm
Forum: Bronsted Acids & Bases
Topic: Fundamental J.15
Replies: 1
Views: 288

Fundamental J.15

We are given a salt and asked to write the chemical equation for the proton transfer reaction of this cation or anion with water. In part a the salt given is NaC6H5O. When the equation is written, sodium is not in the equation. Why is that, does it get dissolved in the water? Answer: C6H5O + H2O--->...
by Sydney Eskew 1H
Tue Nov 17, 2015 9:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Quiz 3 Prep #6
Replies: 2
Views: 300

Re: Quiz 3 Prep #6

I believe that you only need to set up the proportion Kc = [P]/[R] because you are given two of the three values needed to solve the problem.
by Sydney Eskew 1H
Sun Nov 15, 2015 7:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework 11.43
Replies: 3
Views: 410

Re: Homework 11.43

Why is it -2x and not +2x?
by Sydney Eskew 1H
Thu Nov 12, 2015 10:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework 11.43
Replies: 3
Views: 410

Homework 11.43

We are given the reaction 2NO-->N2+O2. If the initial partial pressure of NO is 1.0 bar, and x is equilibrium concentration of O2, what is the correct equilibrium concentraion? I was able to get that the equilibrium concentraion of O2 is x^2 but I don't understand the process of getting the partial ...
by Sydney Eskew 1H
Wed Oct 28, 2015 1:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-shaped vs. Trigonal Pyramidal
Replies: 2
Views: 1553

T-shaped vs. Trigonal Pyramidal

How do you know if a molecule is t-shaped or trigonal pyramidal based on the lewis structure? For example, ICl3 is T shaped but I do not see why. This is homework question 4.9.
by Sydney Eskew 1H
Fri Oct 16, 2015 12:48 pm
Forum: Ionic & Covalent Bonds
Topic: Diatomic Molecules
Replies: 3
Views: 428

Re: Diatomic Molecules

Yep! You are correct.
by Sydney Eskew 1H
Fri Oct 09, 2015 6:15 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: orbitals
Replies: 1
Views: 266

Re: orbitals

The purpose of ms is to describe what the electron is doing, either spinning clockwise(-) or counterclockwise(+). It gives more detail about the electron and what it is doing in the orbital. A question could potentially ask for n, l, m and ms and that is when you would put +1/2 or -1/2.
by Sydney Eskew 1H
Thu Oct 01, 2015 3:04 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Mole Ratio
Replies: 1
Views: 414

Mole Ratio

When we are given a balanced equation, like:
Fe[sub]2O[sub]3+ 3CO --> 2 Fe +3CO[sub]2

How can you assume or imply that 3 mol CO[sub]2 is equivalent to 2 mol Fe?
How do you make those connections?

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