CHEMISTRY COMMUNITY

Tiffany_Hoang_3C

How do I identify which bond is the axial bond and which is the equatorial bond? And how do I know in which direction to draw them?

Tiffany_Hoang_3C

When the numbers are the same (1 and 4), the substituent that is named first (ethyl) should get the lower number (1).

Tiffany_Hoang_3C

Thermodynamic analysis tells us if the forward or reverse process if favored (but does not tell us how fast the reaction is). Kinetic analysis tells us the speed or rate of a reaction.

Tiffany_Hoang_3C

Yes, k is the rate constant so they are both the same. k[A] = k[A]_oe^-kt is not meant to be seen as an equation, but rather as two different ways to express the rate of a 1st order reaction.

Tiffany_Hoang_3C

What would the graphs of a first-order reaction and a second-order reaction look like if we plotted time vs. [A] (instead of time vs. ln[A] and time vs. 1/[A], respectively)?

Tiffany_Hoang_3C

What does the order (first, second, zero) indicate about a reaction?

Tiffany_Hoang_3C

The solutions are posted under the topic "Administrative Questions and Class Announcements".

Tiffany_Hoang_3C

Finals are already available for pick-up in Young Hall 3034.

Tiffany_Hoang_3C

An isolated system is one in which both matter and energy cannot exchange with the surroundings. Not sure if these were shared in your discussion, but some examples of isolated systems include a (very high quality) thermos bottle, a bomb calorimeter, and the universe.

Tiffany_Hoang_3C

Can someone please clarify what the standard state for a pure liquid or solid is? Also, the standard state of an element?

Tiffany_Hoang_3C

Q: Why do chemists enjoy working with ammonia?
A: Because it's pretty basic stuff.

Tiffany_Hoang_3C

Yes, you are correct! pK_A and pK_B are measured on a scale of 0 to 14 since pK_A=-logK_A and pK_B=-logK_B.

A smaller pK_B does indicate a stronger base and a smaller pK_A does indicate a stronger acid.

Tiffany_Hoang_3C

We use prefixes like bis-, tris-, etc when the ligand is a polydentate and we need to indicate the number of ligands. For example, (en) 2 would be bisethylenediamine because en is a bidentate (it binds at two sites and donates two electron pairs) and there are two of that ligand (which is why it is ...

Tiffany_Hoang_3C

For Z < 8, because the nuclear charge is less, the energy difference between filled s-orbitals and p-orbitals is less. The e- density from filled sigma and sigma* orbitals is concentrated along the bond axis, resulting in electron-electron repulsion and thus, a higher energy sigma orbital.

Tiffany_Hoang_3C

In the course reader on page 66, it says we only need to know the s-block, the p-block, and the first row of d-block. So I think chromium and copper are the only exceptions we need to know.

Tiffany_Hoang_3C

The least electronegative atom means not a lot of energy is needed to remove an electron from the atom. This means that it is more likely to share electrons and create bonds, making it a good central atom.

Tiffany_Hoang_3C

For the second question, the formal charge of an atom indicates either a gain or loss of electrons when forming a covalent bond. The equation for formal charge is FC = V - (L + S/2) where V is the number of valence electrons, L is the number of lone pair electrons, and S is the number of shared elec...

Tiffany_Hoang_3C

ΔE is the change in energy (which can be positive or negative and can be found if given the frequency/wavelength of a light emitted/absorbed when an electron moves to a different energy level) while E is simply the energy of a given wavelength/frequency. In #10, we subtract the E of the energy level...

Tiffany_Hoang_3C

The wavelength will be in meters. Rearranging the equation for wavelength, λ=c/v. Since c is in m/s and the frequency is in Hz (which is s^-1 or 1/s), the s will cancel out, leaving you with m.

Tiffany_Hoang_3C

Can a rxn have two limiting reactants? And is it possible that a rxn has no limiting reactants at all? A reaction cannot have two limiting reactants. The limiting reactant is the reactant that limits (the most) the amount of product that can be formed. There will be at most one limiting reactant. H...

CHEMISTRY COMMUNITY

Search found 20 matches

Axial and Equatorial Bonds

Re: numbering the carbons

Re: Kinetics vs. Thermodynamics

Re: Rate 1st Order Rxn

Reaction Order Graphs

Orders

Re: Quiz 1

Re: Fall Quarter Finals

Re: Examples of Isolated systems [ENDORSED]

Standard State [ENDORSED]

Re: Post All Chemistry Jokes Here

Re: pKa and pKb

Re: Quizlet for the names of Common Ligands

Re: MO diagram [ENDORSED]

Re: D-block exceptions for midterm and f-block

Re: Central Atom

Re: Formal Charge [ENDORSED]

Re: What is the difference between deltaE=hv and E=hv?

Re: C=λV units question

Re: Steps for Limiting Reactant Problems