Search found 23 matches

by Maddy_Larson_2J
Sat Mar 18, 2017 12:11 pm
Forum: Balancing Redox Reactions
Topic: How to determine Galvanic Cell molecules
Replies: 2
Views: 359

Re: How to determine Galvanic Cell molecules

So essentially, for the cathode we want the greatest positive value and for the anode we want the greatest negative value?
by Maddy_Larson_2J
Fri Mar 10, 2017 11:16 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: equilibrium constants and free energy [ENDORSED]
Replies: 1
Views: 624

equilibrium constants and free energy [ENDORSED]

When K=0 what does this mean in terms of free energy?
by Maddy_Larson_2J
Mon Mar 06, 2017 10:00 am
Forum: *Nucleophilic Substitution
Topic: double/single-headed arrows
Replies: 6
Views: 1210

Re: double/single-headed arrows

A double headed arrow is used in the case when 2 electrons are getting passed. This is why we normally use a double-headed arrow. A single headed arrow is a little less common as it refers to only 1 electron getting passed. When dealing with bonds we are typically dealing with 2 electrons which is w...
by Maddy_Larson_2J
Wed Feb 22, 2017 12:08 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: 2 step reactions
Replies: 1
Views: 232

2 step reactions

For a two step reactant how do we know which one is slower?
by Maddy_Larson_2J
Mon Feb 20, 2017 8:16 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Differntial rate law vs. Integrated rate law
Replies: 1
Views: 217

Differntial rate law vs. Integrated rate law

I just wanted to clarify that we use the integrated rate law when we are trying to identify a change in [A] and then we can use the differential rate law for everything else? Is this true?
by Maddy_Larson_2J
Sat Feb 11, 2017 7:06 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Changes in both volume and temp [ENDORSED]
Replies: 5
Views: 653

Changes in both volume and temp [ENDORSED]

If we are given a problem that provides us with both an initial volume and temp and a final volume and temp do we have to calculate deltaS for both of these or will 1 calculation of deltaS suffice? I am confused on if we do both S=nCln(T2/T1) and S=nCln(V2/V1)? Thank you very much in advance
by Maddy_Larson_2J
Sun Jan 29, 2017 11:11 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 3
Views: 314

Re: Bond Enthalpies

If we are given the bond enthalpies for a molecule, but there is multiple moles of that molecule would we multiply the bond enthalpy by the number of moles? Thank you in advance!
by Maddy_Larson_2J
Sat Jan 28, 2017 9:07 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy
Replies: 7
Views: 596

Re: Entropy

If entropy is always increasing, then in a non-spontaneous reaction what part of the reaction relates to the increase in entropy if we are using work to create order?
by Maddy_Larson_2J
Sat Jan 21, 2017 8:58 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Homework Question: 8.49
Replies: 1
Views: 250

Homework Question: 8.49

For question 49 in the homework we have to use the equation deltaU=deltaH-PdeltaV to solve for the internal energy. I found H and PV (using the ideal gas equation) and I subtracted them but since PdeltaV was a negative value I ended up getting -318-(-2.47)=-315.53; however, the book got -318-2.47=-3...
by Maddy_Larson_2J
Fri Jan 13, 2017 12:36 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy of Formation Question
Replies: 3
Views: 322

Re: Standard Enthalpy of Formation Question

In the example in the course reader, we were given the deltaH of the rxn (-555.38) . Will we always be given this and then just adjust it based on the amount of moles, etc.?
by Maddy_Larson_2J
Fri Jan 13, 2017 12:32 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 7
Views: 449

Re: Bond Enthalpies

In the course reader when we are looking at method two, all the bond enthalpies are in kJ.mol^-1. However after we add them all up, the units are kJ so I am curious on what happened to the mol^-1?
by Maddy_Larson_2J
Fri Jan 13, 2017 12:27 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: standard reaction enthalpy
Replies: 2
Views: 219

Re: standard reaction enthalpy

In general, what action do we take when the reaction is not in its standard state?
by Maddy_Larson_2J
Fri Dec 02, 2016 12:29 pm
Forum: Polyprotic Acids & Bases
Topic: Fall 2012 Final Exam Question 8
Replies: 1
Views: 410

Fall 2012 Final Exam Question 8

In problem 8 from the 2012 final exam, I understand that we carry over the 4.0x10^5 mol*L^-1 because that is how many H+ atoms are generated in the first dissociation. However, because we end with the same amount of H+ ions after the second reaction, I am confused on if HCO3 generated any H+ ions?
by Maddy_Larson_2J
Mon Nov 21, 2016 1:15 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strong/weak acids
Replies: 6
Views: 1643

Re: Strong/weak acids

If we are given a problem that has a Ka or a Kb then we automatically know it's weak, correct? Since strong acids and bases fully ionize? Thank you!
by Maddy_Larson_2J
Mon Nov 21, 2016 1:12 pm
Forum: Amphoteric Compounds
Topic: Amphoteric vs amphiprotic
Replies: 5
Views: 14135

Re: Amphoteric vs amphiprotic

I see how it relates since the Bronsted definition of an acid is that it can give off a proton, but essentially that's what it says an Amphoteric compound does too. So I guess my question is why would the amphiprotic compounds directly related to the Bronsted definition and not amphoteric? Sorry for...
by Maddy_Larson_2J
Mon Nov 21, 2016 1:09 pm
Forum: Amphoteric Compounds
Topic: Amphoteric vs amphiprotic
Replies: 5
Views: 14135

Re: Amphoteric vs amphiprotic

I was talking with some classmates and they said amphiprotic kind of relates to the Bronsted definition of acids and bases? How is this so? Thank you
by Maddy_Larson_2J
Sat Nov 12, 2016 10:19 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordinate Number
Replies: 3
Views: 446

Re: Coordinate Number

hello,
I am also a bit confused on coordination numbers too. Just to clarify, if we had the compound [Co(NH3)5Cl]Cl then the coordination number would be 6 since there are 6 donor atoms sticking to the cobalt?
by Maddy_Larson_2J
Sat Nov 05, 2016 12:09 am
Forum: Hybridization
Topic: Regions of Electron Density & Naming Hybrid Orbitals
Replies: 3
Views: 318

Re: Regions of Electron Density & Naming Hybrid Orbitals

Do we count loan pairs as regions of electron density? I know we do not typically draw them in Lewis structures but I am not sure about counting them in hybridization. Thank you!
by Maddy_Larson_2J
Mon Oct 24, 2016 5:05 pm
Forum: Electronegativity
Topic: Trends in periodic table
Replies: 6
Views: 682

Trends in periodic table

On Quiz 2 preparation problem #5 it asks us to pick the atom with highest electron affinity. However, they give us a noble gas and I am not sure if the trends of the periodic table are applied to the noble gases since they aren't reactive? Thank you!
by Maddy_Larson_2J
Fri Oct 21, 2016 9:19 am
Forum: Formal Charge and Oxidation Numbers
Topic: How to figure out formal charge? [ENDORSED]
Replies: 6
Views: 803

Re: How to figure out formal charge? [ENDORSED]

When figuring out a formal charge do we count the individual electrons that are shared or the pairs of electrons that are shared or lone?
by Maddy_Larson_2J
Sun Oct 16, 2016 8:28 pm
Forum: Lewis Structures
Topic: Resonance [ENDORSED]
Replies: 5
Views: 529

Re: Resonance [ENDORSED]

I am also confused on resonance. Does resonance in one species continue when it is bonded to another species? For example, Say NO3 were to bond with another molecule. Would the nitrogen prefer a bond to a specific oxygen when other molecules come into play, or would that not matter and any Lewis str...
by Maddy_Larson_2J
Fri Oct 07, 2016 5:55 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration [ENDORSED]
Replies: 4
Views: 426

Re: Electron Configuration [ENDORSED]

I am a little confused about the Diagram on page 63 of our course reader. For an electron with n=3 and l=2 we get a d orbital, but how do we get the numbers -2,-1, 0, 1, 2 in the 5 boxes representing 3d? Thank you!
by Maddy_Larson_2J
Tue Sep 27, 2016 12:39 pm
Forum: Balancing Chemical Reactions
Topic: How familiar should we be with Naming compounds? [ENDORSED]
Replies: 8
Views: 1232

How familiar should we be with Naming compounds? [ENDORSED]

In some of the homework questions, I noticed it will write out names of compounds and ask us to write and balance the chemical equation. This made me wonder if I should be expected to know naming. If yes, does any one know any good resources (along with the course reader) for me to review this? Than...

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