CHEMISTRY COMMUNITY

Cowasjee_Sanaea_3E

I know the professor has probably answered this multiple times, but just to reiterate: We do NOT have to know how to name of a compound that contains both a functional group AND a separate double bond such as number 40 in chapter 2 which asks for the name of an alcohol that also contains a double bo...

Cowasjee_Sanaea_3E

I still don't quite understand the different between steric, angle, and torsional strain?

Cowasjee_Sanaea_3E

I'm still confused as to what A is in the Arrhenius equation?
We never used it in our homework or quiz. Is there a time we will use it?

Is it constant for all equations?

Cowasjee_Sanaea_3E

For the first question, how do you know it is 4- isopropyldecane? I thought that it was just 4-propyldecane

Cowasjee_Sanaea_3E

for the pre-equilibrium approach are you always trying to rewrite the rate law of the fast reaction in terms of the slow reaction to find the overall reaction?

Cowasjee_Sanaea_3E

Why did the white bear dissolve in water?
Because it was polar!

Cowasjee_Sanaea_3E

Q: Why do chemists like nitrates so much?
A: They're cheaper than day rates.

Cowasjee_Sanaea_3E

consider a nano-crystal formed from 8 identical molecules that can have three possible equal energy orientations. calculate the residual (minimum) entropy for this system. I keep getting 1.21 x 10^-22 However the answer is 1.15x10^-22 I can't seem to get the same answer even though I'm fairly certai...

Cowasjee_Sanaea_3E

The question asks to calculate K for a redox reaction at 298 K. And it says you can solve it two ways: However when I try and solve it using Delta G = -RTlnK I keep getting 1.35x10^-72 (whereas the answer is 9.2x10^-72) Known: When solving delta G= 4.1x10^5 J/mol. Could someone please help me out? I...

Cowasjee_Sanaea_3E

Hi! 14.35: determine the equilibrium constants for the following reaction: Mn (s) + Ti^2+ (aq) --> Mn^2+ (aq) + Ti (s) I don't understand why when you solve for the cell potential it is negative?? I thought you always make it so that the cell potential is positive, even if that means reversing the c...

Cowasjee_Sanaea_3E

Hi! I understand that when half reactions don't have a solid that it needs an electrode (such as Pt). However I was confused as to why question 14.13 needs an electrode for I: Ce 4+ (aq) + I- (aq) --> I2(s) + Ce3+(aq) I understand that Ce needs an electronde because both are aqueous. But I thought s...

Cowasjee_Sanaea_3E

I had always thought that the units for entropy was: joules/moles x kelvin
But is it possible for it to be just:
joules/kelvin?

Cowasjee_Sanaea_3E

In problem number 9.63 in the textbook it asks: Determine which of the following compounds are stable with respect to decomposition into their elements under standard conditions at 25 degrees C. The answer was that those with negative free energies were stable. However my understanding was that bein...

Cowasjee_Sanaea_3E

How come when using Hess's law you usually don't include elements in their natural state (such as H2), but when it is combustion you do include it in calculating the enthalpy?
Thanks in advance!

Cowasjee_Sanaea_3E

When is the earliest that we can view a bruincast? Is it posted the day of, the following day? Because a couple times it didn't seem to be on the bruincast website.

Cowasjee_Sanaea_3E

Is there a way to use Henderson-hasselbalch with pOH or pKb? or do you first have to convert everything to pH and pKa and then use the equation?

Cowasjee_Sanaea_3E

When using an ice chart, and solving for X, when is it appropriate to disregard X in the difference between the initial molar concentration and the change in molar concentration? Did Dr. lavelle give a specific number for K? Some number we can use in reference (as in when K is smaller than some numb...

Cowasjee_Sanaea_3E

How come K=1 is rare?

Cowasjee_Sanaea_3E

When naming, when does the transition metal ending change to -ide? and is the transition metal always named at the end when written out, but in the written in the beginning when written with chemical symbols?

Cowasjee_Sanaea_3E

AX3E2 (3 bonds with 2 lone pairs) is considered T-shaped. However I would have thought it would be trigonal planar because the lone pairs would want to get as far away from one another as possible (such as at a 180 degree angle with the 3 bonds in the middle in a triangle shape with 120 degree angle...

Cowasjee_Sanaea_3E

Is Angular the same shape as bent?
And what is T-shaped?

Cowasjee_Sanaea_3E

Hi there! I'm confused on what we should consider to be the electrons in the outer shell? For example I know that for 1s^2 2s^2 2p^6, the number of electrons in the outer shell would be 8 because you would look at the number of electrons in the highest energy level (or valence electrons). But in tha...

Cowasjee_Sanaea_3E

Hi there! I am confused on the answer to question 3.67 in the textbook which asks: "in each of these compounds, an atom violates the octet rule. Identify the atom and explain the deviation from the octet rule? B) ClO2" I would have thought that the answer would have been chlorine in the mi...

Cowasjee_Sanaea_3E

When you are given only constants to work with in a problem, how many sig figs should you use? such as for Rydberg's equation, if all you are given are n=1, and n=3, how many sig figs are you supposed to have in your answer? should you round the constants (such as plank's constant) to a more reasona...

Cowasjee_Sanaea_3E

If a problem tells you (just making up an example) that something with the mass of 10 kg is going at the speed of 3.50 m/s plus or minus .4 m/s, which number would you use to solve the for the momentum? Would delta x be .4 + .4= .8 m/s? And if so, does that mean that in your answer you would only ha...

Cowasjee_Sanaea_3E

When a high energy electron drop to a lower energy level how come it doesn't always drop to the lowest energy level (n=1)? What stops it from releasing all of its energy?

Cowasjee_Sanaea_3E

When the photoelectric effect was conducted, or is conducted, how are the electrons (the ones being emitted) being detected or measured? Are they being detected individually? All together? By the amount of kinetic energy they have? And is their any way that the electrons can be detected visibly (as ...

CHEMISTRY COMMUNITY

Search found 27 matches

Double bonds and functional groups

Difference in Strains

A in the Arrhenius equation

Re: Quiz 3 Winter 2017

Pre-equilibrium

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Midterm 2014 Winter Q5A

Midterm 2013 Q7

14.35

Cell diagram electrode

Units of entropy [ENDORSED]

Gibbs Free Energy: Spontaneous versus Unstable?

Hess's Law

Bruincast posting time

Henderson-Hasselbalch pOH

When can you disregard X? [ENDORSED]

K=1 [ENDORSED]

When does the transition metal change to -ide?

T-Shaped?

What is Angular? And what is T-shaped?

What are considered thhe e- in the outer shell?

Question 3.67 part B?

Sig fig with constants

Heisenberg Uncertainty-Which numbers to use? Sig Figs? [ENDORSED]

Atomic spectra

Photoelectric effect- how is it detected?