CHEMISTRY COMMUNITY

SubparChemist

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...

SubparChemist

Alphabetical for the prefix only, I believe.

SubparChemist

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?

SubparChemist

Was wondering this too, is it possible to have a "partial rate order"?

SubparChemist

Chapter 11, Section 11: Temperature and Equilibrium.

Page 451 show's how it was derived in the greenbox, bottom right hand hand corner.

SubparChemist

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...

SubparChemist

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.

SubparChemist

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.

SubparChemist

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...

SubparChemist

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.

SubparChemist

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 ...

SubparChemist

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...

SubparChemist

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.

SubparChemist

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?

SubparChemist

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?

SubparChemist

"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...

SubparChemist

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?

SubparChemist

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.

SubparChemist

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...

SubparChemist

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...

SubparChemist

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...

SubparChemist

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.

SubparChemist

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 ...

SubparChemist

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.

SubparChemist

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?

SubparChemist

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...

SubparChemist

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...

CHEMISTRY COMMUNITY

Search found 27 matches

Re: Torsional strain V steric strain

Re: Priority of Subsituents

Re: Nucleophiles

Re: Units For K

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

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

Re: Calculation Standard Cell Potentials

Re: O3--> O2

Re: Charging a Pikachu

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

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

8.23 Question About Calorimeters

Re: Question 8.19 units and equation

Thinking Point: Potential energy and isothermal expansion.

Why is BF3 considered a Lewis Acid?

Chapter 12 #9c and 9d

Re: Ignoring x in Chemical Equilibrium

Re: 11.29

Chapter 11 #67 Numbers Not Adding Up?

Re: Equilibrium Partial Pressure: Question 11.7

Do octet exceptions based on formal charge exist?

Re: Midterm 2011 question 6B

Quick Clarification on Notation

Re: Exceptions to the Octet Rule

Re: Shorter vs Longer Wavelength

Sig Figs and Indeterminacy 1.45

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