Search found 27 matches

by SubparChemist
Sat Mar 12, 2016 8:44 pm
Forum: *Cyclopentanes
Topic: Torsional strain V steric strain
Replies: 2
Views: 578

Re: Torsional strain V steric strain

My TA mentioned there were some interactive models online that can help if you just type "torsional strain interactive models" or "steric strain interactive models," though I haven't tried it. We had some actual hands on models during discussion that I messed around with and it h...
by SubparChemist
Sun Mar 06, 2016 3:08 pm
Forum: *Alkanes
Topic: Priority of Subsituents
Replies: 3
Views: 283

Re: Priority of Subsituents

Alphabetical for the prefix only, I believe.
by SubparChemist
Sat Feb 27, 2016 2:13 pm
Forum: *Electrophiles
Topic: Nucleophiles
Replies: 5
Views: 397

Re: Nucleophiles

Do lone pairs take priority over relative position on periodic table?

For example, would an element with less polarizability still be more nucleophilic than an element one down its column if it had more lone pairs?
by SubparChemist
Sat Feb 20, 2016 1:23 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Units For K
Replies: 2
Views: 291

Re: Units For K

Was wondering this too, is it possible to have a "partial rate order"?
by SubparChemist
Tue Feb 09, 2016 7:08 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: How to derive equation for K? (14.35)
Replies: 1
Views: 261

Re: How to derive equation for K? (14.35)

Chapter 11, Section 11: Temperature and Equilibrium.

Page 451 show's how it was derived in the greenbox, bottom right hand hand corner.
by SubparChemist
Mon Feb 01, 2016 3:37 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Chapter 14 IN-TEXT Example 14.4: Self-Test 14.5A
Replies: 2
Views: 349

Chapter 14 IN-TEXT Example 14.4: Self-Test 14.5A

Brief question, for the chemical reaction formula, are we allowed to have fractions in the final equation? Or are fractions only allowed when we're trying to keep whatever we're say for example, combusting (as in last chapter), at only 1 mol? The question states: "Write the chem. equation for t...
by SubparChemist
Sat Jan 30, 2016 5:47 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Calculation Standard Cell Potentials
Replies: 2
Views: 298

Re: Calculation Standard Cell Potentials

THANK YOU, I am noticing this too and I have been so confused. The solutions manual isn't ever reversing the E signs after flipping the equations.
by SubparChemist
Sat Jan 30, 2016 4:24 pm
Forum: Balancing Redox Reactions
Topic: O3--> O2
Replies: 2
Views: 531

Re: O3--> O2

Remember, to balance out the number of oxygens, according to the procedure outlined, you must add one H2O molecule for each oxygen needed to the side. You can then add the amount of H+ to the other side until you have an equivalent number of hydrogen on each side.
by SubparChemist
Sat Jan 30, 2016 2:30 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Charging a Pikachu
Replies: 2
Views: 268

Re: Charging a Pikachu

Is it safe to assume my level 100 Water type Gyrados would still act as a a strong resister against, say a mere level 17 Pikachu, despite water types inherently being vulnerable to Electric type? Or should I just be on the safe-side and use a Ground type pokemon like Onyx for the voltmeter I'm tryin...
by SubparChemist
Mon Jan 25, 2016 9:40 am
Forum: Calculating Work of Expansion
Topic: 8.93a Post-combustion, is the water a gas or liquid?
Replies: 2
Views: 322

Re: 8.93a Post-combustion, is the water a gas or liquid?

Update:

Asked my TA, Dan, and Dr. Lavelle, both informed me it depends on the temperature at which the reaction occurs. Since this combustion was at 25 degrees Celsius, water would be a liquid as a product. Had it occurred at 100 degrees Celsius or higher, it would've been a gas.
by SubparChemist
Mon Jan 18, 2016 6:53 pm
Forum: Calculating Work of Expansion
Topic: 8.93a Post-combustion, is the water a gas or liquid?
Replies: 2
Views: 322

8.93a Post-combustion, is the water a gas or liquid?

When the equation is not given, as in problem 8.93, how do we determine whether the resulting water product of a combustion reaction is a vapor or a liquid? Sometimes I'll see it written as a gas and other times I'll see it written as a liquid. "Calculate the work that must be done against the ...
by SubparChemist
Sat Jan 16, 2016 4:17 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: 8.23 Question About Calorimeters
Replies: 1
Views: 292

8.23 Question About Calorimeters

Is the water bath within a calorimeter considered part of that system? For question 8.23, it asks, "A calorimeter was calibrated with an electric heater, which supplied 22.5 kJ of energy as heat to the calorimeter and increased the temperature of the calorimeter and its water bath from 22.45 de...
by SubparChemist
Sat Jan 16, 2016 4:05 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Question 8.19 units and equation
Replies: 6
Views: 1045

Re: Question 8.19 units and equation

Could just be an error in the solution's manual, I was wondering the same thing Brian. The sig figs in the manual seem sorta wonky at time.
by SubparChemist
Sun Jan 10, 2016 2:01 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Thinking Point: Potential energy and isothermal expansion.
Replies: 1
Views: 224

Thinking Point: Potential energy and isothermal expansion.

One of the thinking points in the book has confused me a bit, not quite sure what the answer is.

"Potential energy is related to position. Therefore, in an isothermal expansion, why is there no potential energy change as the molecules move further away?"

What's the reasoning behind this?
by SubparChemist
Tue Dec 01, 2015 2:36 pm
Forum: Lewis Acids & Bases
Topic: Why is BF3 considered a Lewis Acid?
Replies: 1
Views: 777

Why is BF3 considered a Lewis Acid?

Why is BF3 considered a Lewis Acid? I thought Boron was content with only 6 valence electrons? Could you also give me an example of a reaction in which BF3 acts as a Lewis Acid, with the corresponding equilibrium equation?
by SubparChemist
Mon Nov 23, 2015 8:36 pm
Forum: Bronsted Acids & Bases
Topic: Chapter 12 #9c and 9d
Replies: 1
Views: 260

Chapter 12 #9c and 9d

"Which of the following reactions can be classified as reactions between Bronsted acids and bases? For those that can be so classified, identify the acid and the base. (Hint: It may help to write the net ionic equations.)" c. CH3COOH(aq) + NH3(aq) --> CH3CONH2(aq) + H2O(l) I'm not entirely...
by SubparChemist
Thu Nov 19, 2015 3:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ignoring x in Chemical Equilibrium
Replies: 4
Views: 862

Re: Ignoring x in Chemical Equilibrium

Going off that, is it safe to just never make that approximation? I understand there are problems where it'd be very difficult to solve without making the approximation to zero or using a graphing calculator but would we be deducted points for not utilizing this concept/trick?
by SubparChemist
Thu Nov 12, 2015 6:59 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 11.29
Replies: 2
Views: 364

Re: 11.29

I got mixed up on that too, just do as the above said and treat it based only off the Q as we haven't learn the stuff yet related to Gibbs Free Energy and all that jazz.
by SubparChemist
Sun Nov 08, 2015 8:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chapter 11 #67 Numbers Not Adding Up?
Replies: 1
Views: 182

Chapter 11 #67 Numbers Not Adding Up?

Hi, I'm aware that there's another question about number 67 on the front page, but I've experienced in the past that if I try and ask another question about the same problem in it's thread, it generally won't be noticed so sorry in advance for the extra clutter. Within the solutions manual, after ca...
by SubparChemist
Sun Nov 08, 2015 6:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Partial Pressure: Question 11.7
Replies: 1
Views: 217

Re: Equilibrium Partial Pressure: Question 11.7

There is no actual increase in matter here though, the overall total number of atoms remains the same. This analogy might help: If I have 3 apples and I cut two of them in half, I haven't created more apples, I still have the same amount of apples. I still have 3 apples, one of them is just in a dif...
by SubparChemist
Sun Nov 01, 2015 7:09 pm
Forum: Octet Exceptions
Topic: Do octet exceptions based on formal charge exist?
Replies: 1
Views: 328

Do octet exceptions based on formal charge exist?

This is incredibly hypothetical but I was wondering if there's ever a case where an atom that always wants an octet, such as Nitrogen or Carbon, would forfeit that octet in favor of having a lower formal charge. Hypothetically, say our Nitrogen atom could either have only 6 electrons from a triple b...
by SubparChemist
Sat Oct 31, 2015 6:16 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm 2011 question 6B
Replies: 2
Views: 624

Re: Midterm 2011 question 6B

Yes, you'd need to base your decision off of trends in the periodic table such as you pointed out, ionization energies as well as factors such as atomic radius.
by SubparChemist
Sat Oct 24, 2015 8:14 pm
Forum: Hybridization
Topic: Quick Clarification on Notation
Replies: 1
Views: 202

Quick Clarification on Notation

In our solutions manual and throughout the text book, hybridization is written in the order of s, then p, then d. But Dr. Lavelle always seems to write it in order of d first, then s and then p. Show we treat this notation pretty arbitrary with the order of the d? I know this is a silly question, I ...
by SubparChemist
Thu Oct 15, 2015 6:34 pm
Forum: Lewis Structures
Topic: Exceptions to the Octet Rule
Replies: 2
Views: 304

Re: Exceptions to the Octet Rule

Yes, it's an exception to the octet rule because of its comfortability with just two electrons fulfilling its shell.

But like Erin I believe there's a few others not mentioned, I'm not sure what they are though, sorry.
by SubparChemist
Sat Oct 10, 2015 11:25 am
Forum: Properties of Light
Topic: Shorter vs Longer Wavelength
Replies: 6
Views: 1322

Re: Shorter vs Longer Wavelength

Adding onto this, there's something I've been confused about. Is there more energy because a greater amount of photons is able to bombard the electron at a given instance because of the higher frequency or because each individual photon just has more energy?
by SubparChemist
Sun Oct 04, 2015 4:45 pm
Forum: Significant Figures
Topic: Sig Figs and Indeterminacy 1.45
Replies: 1
Views: 286

Sig Figs and Indeterminacy 1.45

1.45 A bowling ball of mass 8.00 kg is rolled down a bowling alley lane at 5.00 plus/minus 5.0 m per sec. What is the minimum uncertainty in its position? Should I ignore the fact that sig figs of the variance/spread is two and just stick with the three sig figs the two other values use? I'm just u...
by SubparChemist
Wed Sep 30, 2015 7:11 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 90
Views: 7836

Re: All students read this sig fig post [ENDORSED]

I'm pretty sure that's what he's interested in, using the lowest number of significant figures for the given numbers. So if a problem gives 2.06 g of Carbon and 1.001 g of Nitrogen, you'd use 3 significant figures in your final answer as your Carbon quantity only has 3 sig figs despite your Nitrogen...

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