Search found 25 matches

by jgreynoso 2J
Fri Mar 11, 2016 3:44 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: 1.23 Intro to Organic Chem Solving All Possible Isomers
Replies: 2
Views: 354

Re: 1.23 Intro to Organic Chem Solving All Possible Isomers

Will we be asked to draw geometric isomers or only questioned about cis/trans naming?

Thank you.
by jgreynoso 2J
Thu Mar 03, 2016 12:02 pm
Forum: *Cycloalkenes
Topic: Intro to Organic Chemistry Question 1.21
Replies: 5
Views: 612

Re: Intro to Organic Chemistry Question 1.21

Thank you! So how come on page 43 of the organic chem book, question 1.35, the numbering starts with the tert and then the 3 is on the substituent? Should not the numbering follow the double bond initially on the tert-butyl, causing the substituent to have a number of 5?
by jgreynoso 2J
Wed Mar 02, 2016 3:23 pm
Forum: *Cycloalkenes
Topic: Intro to Organic Chemistry Question 1.21
Replies: 5
Views: 612

Re: Intro to Organic Chemistry Question 1.21

How come it is not 1,4 for the pentadiene and 3 for the methyl? Do you want lower numbers for the double bonds first?

Thank you.
by jgreynoso 2J
Wed Mar 02, 2016 3:11 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: 1.23 Intro to Organic Chem Solving All Possible Isomers
Replies: 2
Views: 354

1.23 Intro to Organic Chem Solving All Possible Isomers

How does one know how many possible isomers there are from a specific molecular formula. Is there a certain trick? How would one know he or she is done and have all the correct different possible isomers ? Also, what is the difference between constitutional and geometrical as 1.22 only asked for con...
by jgreynoso 2J
Thu Feb 25, 2016 4:07 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: E a Concerning Spontaneity
Replies: 2
Views: 355

Re: E a Concerning Spontaneity

Thank you! As a follow up,a negative delta G between the products and reactants expresses how a reaction is spontaneous and exergonic. If the activation energy or the delta G is not overcame during the reaction, would the reaction still be considered spontaneous?

Thank you
by jgreynoso 2J
Wed Feb 17, 2016 5:44 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: E a Concerning Spontaneity
Replies: 2
Views: 355

E a Concerning Spontaneity

Hello. How does one tell how a reaction is spontaneous or not in relation to the magnitude of the activation energy? Would it be based off of the difference in energy from the reactants to the products?

Thank you.
by jgreynoso 2J
Mon Feb 08, 2016 7:00 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: log(Q) vs. ln(Q) in the nernst equation
Replies: 3
Views: 930

Re: log(Q) vs. ln(Q) in the nernst equation

How can that be the case for ln if question 8 of midterm practice 2012 does not include temperature ?

Thank you.
by jgreynoso 2J
Mon Feb 08, 2016 6:57 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Midterm 2012 Question 8
Replies: 3
Views: 423

Re: Midterm 2012 Question 8

If the base in the natural log changes the result, does that mean the concentration for Zn2+ will be different? Or do the equations both provide the correct answer?

Thank you.
by jgreynoso 2J
Tue Feb 02, 2016 8:05 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Standard Reduction Potential as Intensive Property
Replies: 2
Views: 1479

Standard Reduction Potential as Intensive Property

In the start of electrochemistry, it was addressed that the standard reduction potential is an intensive property. I think I understand it a little, but can someone clarify what "voltage does not depend on how many times the reaction occurs" means? Also, how come density was stated to also...
by jgreynoso 2J
Wed Jan 27, 2016 10:39 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: 9.77 Calculating W
Replies: 1
Views: 241

9.77 Calculating W

How does this problem relate to the number of particles and number of states in finding W? I do not understand fully what the two quanta of energy and the three atoms represent. How does one solve for part a and b?

Thank you
by jgreynoso 2J
Wed Jan 27, 2016 4:57 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question #11 on Practice Quiz 1 2015
Replies: 3
Views: 443

Re: Question #11 on Practice Quiz 1 2015

How is the water associated in this problem? I understand there is heat released from the conversion of PbO to Pb. Is this question asking from the heat of this, how many grams of water can be heated? So, water is not part of the equation? It is simply a part two?

Thank you
by jgreynoso 2J
Tue Jan 19, 2016 9:12 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.43 Heating Curve
Replies: 1
Views: 247

8.43 Heating Curve

I am aware of how the heating capacities and the standard enthalpies of physical change influence the heating curve. For the specific problem's case, choice c is the one that best fits it. How come the graph does not start at zero when the heat is supplied such as all the other graphs? Does the comp...
by jgreynoso 2J
Thu Jan 14, 2016 12:32 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat of Calorimeter vs Reaction
Replies: 1
Views: 315

Heat of Calorimeter vs Reaction

On question 8.25, the method in answering the question is based on solving the heat capacity first and then utilizing the equation q (rxn) = -q (calorimeter) with the 2.49 K or degree C temperature rise. How will one know if the equation is instead -q (rxn) = q (calorimeter)? Is this based on if the...
by jgreynoso 2J
Thu Jan 07, 2016 3:52 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Internal Energy for Heating at Constant Pressure
Replies: 1
Views: 205

Internal Energy for Heating at Constant Pressure

As shown in example 8.6 in part b, the internal energy was found by adding up the two changes from heating to the final temperature and allowing the gas to expand isothermally. Will the change during the expansion at constant temperature always equal zero? If not, when or what causes the difference?...
by jgreynoso 2J
Wed Dec 02, 2015 8:20 pm
Forum: Identifying Acidic & Basic Salts
Topic: pH of salts/hw #12.65
Replies: 3
Views: 1191

Re: pH of salts/hw #12.65

How come for part e, the Cl3 in AlCl3 is switched with a (H2O)6 +3?
by jgreynoso 2J
Wed Dec 02, 2015 5:58 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Problem 12.35 Weak acids and bases- Ka2 Part d
Replies: 1
Views: 270

Problem 12.35 Weak acids and bases- Ka2 Part d

In the solutions, I understand how they calculated Ka1 by isolating Ka1 from the pKa1 in relation to the negative log. However in the problem for part d, it says that HSeO4- has a Ka2 of 1.92 instead of a pKa1. The solutions have the pKa2 as a pKa1 and simply solved for the Ka1 like in parts a-c. Is...
by jgreynoso 2J
Thu Nov 26, 2015 1:00 pm
Forum: Bronsted Acids & Bases
Topic: Fundamental J.5 Part C: Net Ionic Equation
Replies: 1
Views: 243

Fundamental J.5 Part C: Net Ionic Equation

I understand how the overall and complete ionic equations are formed for part c, but do not understand the net ionic equation found in part c. I understand that for the net ionic, the Li+ (aq) and I- (aq) ions are cancelled out. Shouldn't the net ionic equation be OH-(aq) + H+(aq) -> H2O (l)? Why is...
by jgreynoso 2J
Wed Nov 18, 2015 9:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.39 Combination of Reactions
Replies: 2
Views: 378

11.39 Combination of Reactions

For this problem, I understand how they got K for the reaction, but am unsure about the reaction addition done. I am curious and do not know fully why the addition of the two separate reactions, as seen on page 269 of the solutions manual, resulted in the reaction of the problem. What happened to th...
by jgreynoso 2J
Wed Nov 11, 2015 6:55 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: (edta) Ligand's Binding Sites
Replies: 1
Views: 444

(edta) Ligand's Binding Sites

I understand that the ligand can bind at 6 sites to a central ion because of the lone pairs of each oxygen with only one single bond, making it hexadentate. Why do the other oxygens which are double bonded not count as binding sites if they also contain lone pairs?

Thank you
by jgreynoso 2J
Tue Nov 03, 2015 5:32 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm question concerning constants
Replies: 2
Views: 558

Midterm question concerning constants

I have gone to several past review sessions and recognized how most TA's leave off the actual number for the constant when doing their work to arrive for an answer. For example , one would calculate the energy through E=hv. The number for the frequency would be shown but Plank's constant is left out...
by jgreynoso 2J
Thu Oct 29, 2015 9:26 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond order for H2+ and He2 concerning bond length
Replies: 1
Views: 6713

Bond order for H2+ and He2 concerning bond length

As seen in lecture and in the course reader page 15 of ch 4, H2+ has a bond order of (1/2). I have learned that single bonds are weakest but are the longest whereas for example, a double bond is stronger than a single bond but shorter. Does this mean H2+ has a longer bond length than those with sing...
by jgreynoso 2J
Fri Oct 23, 2015 4:34 pm
Forum: Hybridization
Topic: Lecture 10/23 on Hybridization of Ethene
Replies: 1
Views: 386

Lecture 10/23 on Hybridization of Ethene

Mr. Lavelle showed the lewis structure of both acethylene and ethene today. I am a little confused about the delocalized pi bonds. For acethylene with an sp hybridization, Lavelle illustrated that it contains two electrons occupying different orbitals with parallel spin in the 2p. Whereas for ethene...
by jgreynoso 2J
Thu Oct 15, 2015 12:21 pm
Forum: Resonance Structures
Topic: Ex 3.5 Ozone structure
Replies: 1
Views: 487

Ex 3.5 Ozone structure

In relation to the resonance of the Lewis structure for ozone, I do not fully understand why there is only one single bond. In high school, I remember the concept of the HONC rule where oxygen would have 2 bonds. This contradicts with how one side of the structure only has a single bond. Though I am...
by jgreynoso 2J
Fri Oct 09, 2015 12:49 am
Forum: Molarity, Solutions, Dilutions
Topic: Aqueous Solution Problem L.7 Part b
Replies: 1
Views: 324

Aqueous Solution Problem L.7 Part b

Concerning fundamental L problem 7, part b has an answer of "slightly soluble" for the lead(II) chloride. As I examined the L.1 chart for solubility rules, I did not notice that this ionic compound is an exception and saw chloride as a soluble compound. I then placed the answer as soluble,...
by jgreynoso 2J
Thu Oct 01, 2015 11:49 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: ± vs. Δ
Replies: 4
Views: 1209

Re: ± vs. Δ

I believe that delta v is 5.0 m/s as delta v represents the uncertainty in the speed. It says in the problem that it is going down 5.00 m/s, plus or minus 5.0 m/s. The plus or minus 5.0 m/s would then illustrate the uncertainty of the speed needed when using the uncertainty principle.

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