Search found 23 matches

by 104607508
Wed Mar 09, 2016 6:11 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Final 2010 question 1C
Replies: 2
Views: 383

Final 2010 question 1C

The question asks whether ethane or ethene has the higher heat capacity but i don't understand why ethane has a higher heat capacity when ethene has a double bond and would therefore require more energy to break? Also is there any specific way that the calculations ought to be done?
by 104607508
Sun Mar 06, 2016 10:44 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Chair vs Boat Conformation
Replies: 2
Views: 560

Re: Chair vs Boat Conformation

do we now have to draw all cyclo molecules in their respective formations? Like cyclohexane in the chair formation and cyclopentane in the envelope formation?
by 104607508
Sun Feb 28, 2016 9:32 pm
Forum: *Alkenes
Topic: Can we draw line structures in multiple ways?
Replies: 2
Views: 403

Re: Can we draw line structures in multiple ways?

But when you're drawing an isomer how can you check that you're actually drawing a valid different structure to get the credit?
by 104607508
Sun Feb 21, 2016 10:21 pm
Forum: *Electrophiles
Topic: Deciding where electrophile goes
Replies: 2
Views: 397

Re: Deciding where electrophile goes

how do you know which type of arrow to use, are bonds considered a two sided arrow and lone pair a single sided arrow or are there sometimes any exceptions?
by 104607508
Sun Feb 14, 2016 3:20 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: When to use steady-state vs. pre-equilibrium
Replies: 4
Views: 968

Re: When to use steady-state vs. pre-equilibrium

when writing the rate laws for elementary reactions the textbook says "The reverse of step 2 is too slow to affect the rate and so is not included." (634) how are we supposed to know when a reaction is to slow to include?
by 104607508
Sat Feb 13, 2016 5:14 pm
Forum: General Rate Laws
Topic: First order and second order reaction rates
Replies: 3
Views: 2260

Re: First order and second order reaction rates

how can we tell when a reaction will have a fractional rate order? is it when the products decompose into the reactants?
by 104607508
Tue Feb 09, 2016 9:42 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Winter 2013 Midterm #3
Replies: 2
Views: 337

Re: Winter 2013 Midterm #3

In part a of this problem you use mc(delta)t to find the heat of the katana but the specific heat of carbon is given in J/KgK but in the solution the (delta)T is in Celsius so the unit don't technically cancel out. Why dont you convert to kelvin when solving for (delta)T is it because the value you ...
by 104607508
Mon Feb 08, 2016 10:07 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Midterm 2011 question 7/8 part D
Replies: 2
Views: 367

Midterm 2011 question 7/8 part D

for part d, I know that you use the nerst equation to solve the problem but in the solution in the course reader RT/F are given as 0.0592 but when I plug those constants into my calculator the value I get is 0.025678 which is half of .0592 so I was wondering why the number is multiplied by two?
by 104607508
Sun Feb 07, 2016 12:48 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Winter 2011 Midterm Question #3
Replies: 1
Views: 239

Winter 2011 Midterm Question #3

The question asks that for the change in entropy and the total change in entropy of 50.0 g of water at 20 degrees celcius when it is mixed with 65.0 g of water at 50.0 degrees celcius. I understand that q=mc(delta)t is necessary for this problem and that because you're mixing the water mc(delta)t=-m...
by 104607508
Sat Feb 06, 2016 2:00 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Relationship between internal energy and temperature
Replies: 4
Views: 3461

Re: Relationship between internal energy and temperature

how do you know when delta u equals simply work or when delta u equals work plus heat?
by 104607508
Sun Jan 31, 2016 10:25 pm
Forum: Balancing Redox Reactions
Topic: Balancing redox
Replies: 1
Views: 278

Re: Balancing redox

So to balance redox equations do we basically do the same thing as with hess' law but with electrons instead of moles?
by 104607508
Fri Jan 29, 2016 4:56 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Electrode
Replies: 1
Views: 219

Re: Electrode

When you are drawing the cell model for a battery how do you determine which way the current flows? Is that part of the problem just provided for us or is there some specific way to figure that out?
by 104607508
Sun Jan 24, 2016 8:05 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Another Question about Quiz 2014 #9
Replies: 5
Views: 619

Re: Another Question about Quiz 2014 #9

I understand the formula for the problem but when doing the summation of the deltaS it calls for the summation of the compound minus the reactants but in this problem the compound is the reactant so how would you go about doing the calculations? Thanks
by 104607508
Sat Jan 23, 2016 4:13 pm
Forum: Calculating Work of Expansion
Topic: Reversible vs. Irreversible Reactions
Replies: 3
Views: 706

Re: Reversible vs. Irreversible Reactions

In one of the first examples in chapter 8 there is a problem that concludes that reversible expansion is the one that requires more work from the system, but why is this the case? Also, is reversible expansion always more work stringent that irreversible expansions?
by 104607508
Sun Jan 10, 2016 8:29 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated and Closed Systems
Replies: 3
Views: 550

Re: Isolated and Closed Systems

I have another question about the types of systems. How does the type of system (close, open, or isolated) affect the rate at which energy moves? Also does the type of system not become affected by the actual system or does the type of system play a role in the way in which a system behaves?
by 104607508
Sun Dec 06, 2015 12:58 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating Compound Drawing
Replies: 4
Views: 974

Re: Chelating Compound Drawing

I have a question about the same problem. I don't understand how you're supposed to know that Dimercaprol has two S and one O to actually bind to the Hg2+? is that just something that has to be assumed or is that something that was supposed to be know from lecture?
by 104607508
Sun Nov 22, 2015 4:17 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: ICE table when calculating for pH
Replies: 3
Views: 898

Re: ICE table when calculating for pH

I have another question relating to this topic. How can you calculate the pH pf an acid when you're given only the pOH of the solution? I don't understand how the two things correlate to give you the answer.
by 104607508
Sun Nov 15, 2015 7:18 pm
Forum: Naming
Topic: Naming Coordination Compounds?
Replies: 2
Views: 584

Re: Naming Coordination Compounds?

When naming something like [Co(NH3)4(NO2)Cl]Cl the transition metal is simply written as Cobalt but when naming something like K3[CoF6] the cobalt is written as cobaltate, why is that, both of the coordination complexes have cobalt in them is it due to the fact that in K3[CoF6] the coordination sphe...
by 104607508
Sun Nov 08, 2015 11:17 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Shape of Coordination Compounds
Replies: 1
Views: 296

Shape of Coordination Compounds

When a coordination compound is formed and the ligands attach themselves to the central metal atom, are all the attached ligands within the coordination sphere is the compound always octohedral?
by 104607508
Mon Oct 26, 2015 4:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs and Molecular Shape
Replies: 3
Views: 413

Re: Lone pairs and Molecular Shape

If yo are asked to draw the Lewis dot structure for an ion that has an odd number of electrons how does one do that. For example CO+ has only 9 electrons, so how does one draw the structure since the molecule would have just one lone electron instead of a lone pair of electrons?
by 104607508
Sun Oct 18, 2015 2:33 pm
Forum: Electronegativity
Topic: Bond size and dipole moments
Replies: 1
Views: 1222

Bond size and dipole moments

If the central atom of a molecule has on double bond and two single bonds, how is the dipole moment of the shared electron affected? Is the double bond more negative than the single bonds because there are more electrons in that part of the molecule?
by 104607508
Sun Oct 11, 2015 2:42 pm
Forum: Lewis Structures
Topic: Xe Lewis Dot Structure
Replies: 2
Views: 3716

Xe Lewis Dot Structure

I understand the rule behind drawing Lewis Dot Structures and the general need for various atoms to follow the octet rule which renders them more stable, but what i don't understand is why an element like Xe can form bonds with 6 fluorides and still have an extra two electrons because I'm not sure i...
by 104607508
Thu Oct 01, 2015 4:49 pm
Forum: Quantum Numbers and The H-Atom
Topic: Lecture Question
Replies: 1
Views: 299

Lecture Question

During the lecture, when the frequency of light emitted by a hydrogen atom as it moved from different transitions levels (specifically from the fourth to the second quantum level) the answer that was arrived at was negative. Since \Delta E=E_{Final}-E_{Initial} , the change in energy was -4.09 x 10 ...

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