CHEMISTRY COMMUNITY

Vicky Wang 2C

Sorry, this might not be the right place to post this question but I didn't see a common name section... 2.48) Give the systematic name for menthol. The answer key says the answer is 2-isopropyl-5-methylcyclohexanol. Isn't that the common name and not the systematic/ IUPAC one? Wouldn't the answer b...

Vicky Wang 2C

I know that you list substituents in terms of alphabetical order, but when you number substituents on cycloalkanes, is it by alphabetic order or by which one has the largest atomic number? Does atomic number play a part in determining anything besides priority with in naming with alkenes (E,Z)? This...

Vicky Wang 2C

The answer key says that the correct answer is (E)-4-bromo-3-methyl-3-heptene. But why is it E instead of Z (or trans instead of cis)? Aren't the bromo and the methyl on the same side? Thanks!

Vicky Wang 2C

"Determine the rate constant for each of the following first-order reactions, in each case expressed for the rate of loss of A: (c) 2A --> B + C" I'm a little confused-- wouldn't 2A --> B + C be considered a second order reaction? Why do we treat it as first order? Because the question say...

Vicky Wang 2C

What happens if pressure isn't given in bar and is, say, torr instead?

Vicky Wang 2C

When you're using the Nernst equation and the question gives you two different units to input for Q (for example, like molarity and bar for question 43), do you have to convert them at all or can you just leave them as is? Why is it okay to have both partial pressure and molar concentration in the s...

Vicky Wang 2C

"Use the data in Appendix 2B and the fact that, for the half-reaction F₂(g) + 2H⁺(aq) + 2e- --> 2HF(aq), E° = 3.03V, to calculate the value of K_a for HF."

The solutions manual says that the reduction half reaction should be F₂(g) + 2 e- --> 2F-. How do you figure this out?

Vicky Wang 2C

More complex molecules means more atoms-- more atoms means more bonds vibrations that can absorb energy/ more ways energy can be distributed, which means higher entropy. More complex molecules also mean larger mass and therefore a larger amount of fundamental particles.

Vicky Wang 2C

"Which is the thermodynamically more stable iron oxide in air, Fe 3 O 4 (s) or Fe 2 O 3 (s)? Justify your selection." The solutions manual says to set up the "reaction that interconverts the two compounds", calculate \Delta G r , and determine whether that reaction is spontaneous...

Vicky Wang 2C

"The reaction of 1.40g of carbon monoxide with excess water vapor to produce carbon dioxide and hydroen gases in a bomb calorimeter causes the termperature of the calorimeter assembly to rise from 22.113 degrees C to 22.799 degrees C. The calorimeter assembly is known to have a total heat capac...

Vicky Wang 2C

"How much heat is required to convert a 42.30 g block of ice at -5.042 degrees C into water vapor at 150.35 degrees C?" I'm still a little confused as to why we have to break this up into the different stages (raising temp of ice, melting ice, raising temp of water, etc.). Also, the answer...

Vicky Wang 2C

Yes you're right-- sorry, I got really confused.

Vicky Wang 2C

"A buffer solution of volume 300 mL is .200 M CH3COOH(aq) and .300 M NaCH3CO2(aq). The pKa for acetic acid is 4.75. What mass of NaOH would have to be dissolved in this solution to bring the pH to 6.0?" According to the solution, it says you'd use the Henderson-Hasselbalch Equation with th...

Vicky Wang 2C

Sorry I'm terribly confused. For part b) of question J.5: "Complete the overall equation, and write the complete ionic equation and the net ionic equation for each of the following acid-base reactions. If the sbstance is a weak acid or base, leave it in its molecular form in the equations. b) (...

Vicky Wang 2C

They can be used interchangeably. If you look in your course reader, you'll notice that there's two columns for naming ligands and one of them is titled "New IUPAC Name Convention". There was some sort of convention where a bunch of chemists got together and decided to make those new namin...

Vicky Wang 2C

Sorry, to clarify a few things... Is a ligand the atom or the molecule that binds to a TM?
And do polydentate ligands count more towards the coordination number? So if a coordination compound consisted of 2 bidentate ligands and 3 monodentate ones, would the coordination number be 7?

Vicky Wang 2C

(CO 3 ) 2- has 2 oxygen atoms that can act as donor atoms to bond to a central atom. This is because the two O atoms have a lower formal charge/ can act as a Lewis Base and donate an electron pair. (CO 3 ) 2- does not have more than 2 donor atoms though. Because of this, it can act as a monodentate ...

Vicky Wang 2C

I'm a little confused about determining which form of a molecule has the lowest formal charge and is therefore the most stable. Would you automatically choose the form with the most atoms with a formal charge of 0 even if that means the other atoms in that form of molecule had charges much higher or...

Vicky Wang 2C

"Write the Lewis structure and predict whehter each of the following molecules is polar or nonpolar: a) CH 2 Cl 2 " According to the answer manual, the Lewis structure looks like the below image and the molecule is polar (sorry about the picture angle). IMG_2276.JPG This might be a stupid ...

Vicky Wang 2C

Being at ground state means that the electrons are occupying the lowest possible energy levels. That means that they follow Hund's Rule, the Pauli Exclusion Principle, etc. In the diagram form (the thing will all the arrows), you can tell that the electron configuration is at ground state based on w...

Vicky Wang 2C

I know some questions ask you to balance formulas with reactants like hydrogen gas or cobalt metal, and I remember from previous chem classes that you'd write hydrogen gas as H 2 , but I can't remember why that is. I don't remember how you're supposed to write a metal either-- in the case of cobalt ...

Vicky Wang 2C

1.17 The energy levels of hydrogenlike one-electron ions of atomic number Z differ from those of hydrogen by a factor of Z^{2} . Predict the wavelength of the transition from n = 2 to n = 1 in He+. I understand that you have to use the Rydberg equation to solve for frequency and then plug that into ...

CHEMISTRY COMMUNITY

Search found 22 matches

Homework 2.48- Systematic or Common

Alphabetic Order or Atomic Number?

Question 1.26- Why E instead of Z?

Questions 15.23c

Re: Nernst Equation- Units for Q

Nernst Equation- Units for Q

Question 14.97- Figuring out the other half rxn

Re: Standard Entropy

Question 9.81- Comparing Stability using delta G

Question 8.53- Knowing which eqn to use to find q

Question 8.87- Breaking phase changes up into steps [ENDORSED]

Re: 2014 Final #8- Raising pH

2014 Final #8- Raising pH

Homework J.5- Writing the overall equation

Re: Ending differences

Ligand Definition and Coordination Number

Re: (CO3)^2-

Lowest Formal Charge

Question on 4.25

Re: Ground State configurations

Writing formulas with gases and metals

Question on 1.17