CHEMISTRY COMMUNITY

Amanda Salgado 3D

Dr. Lavelle, Thank you so much for all that you have done these past two quarters in chemistry. You have been such a wonderful and resourceful professor and I have learned so much being in your class. It has been such a great two quarters knowing that I had a professor that genuinely cared about stu...

Amanda Salgado 3D

I asked the guy sitting next to me if he had any Sodium Hypobromite…
He said NaBrO

Amanda Salgado 3D

Why is CH3Cl considered an electrophile (electron deficient) when chlorine has six electrons around it?

Amanda Salgado 3D

What is the chemical formula for banana?

BaNa2

Amanda Salgado 3D

Are all my jokes too basic for you? Why is there no reaction?

Amanda Salgado 3D

The question asks you to calculate the standard enthalpy of formation for HI(g). I calculated the standard enthalpy without HI and got 15.52, I then subtracted it from 84 KJ/mol, but the correct way was to subtract it from 42 KJ/mol. Why is it subtracted from 42 and not 84 KJ/mol?

Amanda Salgado 3D

I have many good chemistry jokes....

I'm just afraid they won't get a good reaction.

Amanda Salgado 3D

What are the differences in characteristics of a reversible system versus a irreversible system? Which one is more efficient?

Amanda Salgado 3D

I don't trust atoms.....

I heard they make up everything.

Amanda Salgado 3D

Just to clarify, when going from up from a solid, to liquid, to gas...the result is a positive number, and when going down from a gas, to a liquid, to a solid, the result is a negative number?

Amanda Salgado 3D

When a Ka and Kb are given, is it safe to always assume away the x when calculating it in the equation because they are a weak acid/weak base?

Amanda Salgado 3D

Why is it that as the atomic radius increases, the acidity increases?

Amanda Salgado 3D

Are weak acids still considered to be in equilibrium even with the favoring of the products?

Amanda Salgado 3D

The molecular diagram you would use is the Z<8 one because carbon's atomic number is 6, however when filling in the valence electrons you would use 10 because it is two carbons(C2) (4+4) with a negative 2 charge so (+2 valence electrons). The bond order of this would be calculated using the middle p...

Amanda Salgado 3D

Kc is an equilibrium constant and therefore cannot be changed. Even if the concentration is changed, the constant stays the same, however, if the temperature is changed, does the equilibrium constant change in this case?

Amanda Salgado 3D

Also, the central atom can only have an expanded octet if it's phosphorous and anything beyond on the periodic table because they are reaching the d-orbitals. In addition, it is also important to note that carbon always needs a full octet.

Amanda Salgado 3D

Yes, sigma and pi bonds are both a form of covalent bond. A sigma bond is formed when two orbitals overlap(interact) end-to-end, and pi bonds are formed when two orbitals overlap side by side.

Amanda Salgado 3D

Yes that clears things up,thank you!

Amanda Salgado 3D

The question asks you write out the abbreviated electron configuration of Te^-2, the solutions manual states that the answer is [Xe], however is the answer still valid as [Kr] 5s^2 4d^10 5p^6 (with no unpaired electrons)?

Amanda Salgado 3D

In addition, when balancing and there is an odd number of either product or reactant, try doubling (multiplying everything by 2) to make it an even number, and balance the rest of the equation from there, hopefully creating the same amount of reactants to products.

Amanda Salgado 3D

When a problem states that the electron is absorbing light, then delta E will be a positive value, and when it states that it is emitting light, delta E will be a negative value?

Amanda Salgado 3D

Chapter 1 question 9 gives a chart with different values varying from frequency, wavelength, and energy of photons. Parts of the chart are blank and more specifically in the 4th row, 2.5nm is given as the wavelength. I have already figured out the frequency which is 1.2 x 10^-17 Hz and in order to f...

CHEMISTRY COMMUNITY

Search found 22 matches

Re: Saying Thank You to Dr. Lavelle

Re: Post All Chemistry Jokes Here

Nucleophile & Electrophile

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Winter 2015 Midterm question 2and 3c

Re: Post All Chemistry Jokes Here

Reversible vs. Irreversible

Re: Post All Chemistry Jokes Here

phase changes [ENDORSED]

Ka and Kb

Acidity and atomic radius

Strong and Weak Acids

Re: MO Diagram/ Bond Order (C2)^2-

Chemical Equilibrium constant

Re: Octet rule

Re: Sigma and Pi bonds vs Covalent [ENDORSED]

Re: Chapter 3 Question 21 [ENDORSED]

Chapter 3 Question 21 [ENDORSED]

Re: Balancing Chemical equations too slow... any advice? [ENDORSED]

Delta E Question from the delta E= Efinal-Eintial equation [ENDORSED]

Chapter 1 homework question