CHEMISTRY COMMUNITY

Sydni Stewart

You are a chemistry saint. Thank you.

Sydni Stewart

In each of the following salts, either the cation or the anion is a weak acid or a weak base. Write the chemical equation for the proton transfer reaction of this cation or anion with water: (a) NaC6H5O; (b) KClO; (c) C5H5NHCl; (d) NH4Br. Why are we supposed to ignore the Cl in C5H5NHCl but not in ...

Sydni Stewart

Bronsted acids are actually characterized as donating protons, not accepting them, so in the case of H2SO4, the molecule would become deprotonated and lose one of its H atoms to become HSO4^(1-). This is a case in which an anion can act as an acid because HSO4^(1-) can donate another H+ to become S...

Sydni Stewart

In each of the following salts, either the cation or the anion is a weak acid or a weak base. Write the chemical equation for the proton transfer reaction of this cation or anion with water: (a) NaC6H5O; (b) KClO; (c) C5H5NHCl; (d) NH4Br. Why are we supposed to ignore the Cl in C5H5NHCl but not in K...

Sydni Stewart

Why is H2SO3 considered a bronstead acid? I know bronstead acids are defined by their tendency to accept protons/Hydrogen ions, but how do we see that in H2SO4? Also same question for Ca(OH)2, how do we tell it's a bronstead base?

Sydni Stewart

monodentate : di-,tri-,tetra-, penta-, hexa-

polydentate: bis-, tris-, tetrakis-

Sydni Stewart

In class, Lavelle mentioned we would not need to know equilibrium constants until 14b, so what exactly do we need to know in regards to what we've learned about Ka and Kb?

Sydni Stewart

Anions with a bigger atomic radius have a higher polarizability because electrons on the outer shell of big anions don't have a very strong pull towards the nucleus and are therefore easily taken Cations with a smaller atomic radius have higher polarizing power because the nucleus pull is very stron...

Sydni Stewart

If i'm not mistaken, sigma bonds can be the overlap (or hybridization) of various bonds. For example s&s or s&p or even s&d. But pi bonds are the the overlapping of p&p exclusively

Sydni Stewart

Just for clarifiction, when we're asked to use "the VSEPR Model" what does that refer to? Drawing the VSEPR structure? Or determining the AXE formula? Or other?

Sydni Stewart

How do we know when a compound has a dipole moment? Do they all have one?

Sydni Stewart

I know the final is cumulative but does anybody know if it is more focused on topics we have not yet been tested on?

Sydni Stewart

Why exactly do pi bonds break when they're rotated?

Sydni Stewart

For this, is there a way to calculate or memorize bond angles when there is a lone pair? It is usually slightly different than the angles of the normal structure. Is there a set degree amount that a lone pair shifts a bond? There's no set amount of change I believe. I just know that the more lone p...

Sydni Stewart

Does anybody know when the Final review sessions begin? Will it be before or after the week 9 test is administered?

Sydni Stewart

I'm pretty sure when we're using the wedges and dashed lines (vsepr structures) , we're only interested in showing electron density and the resulting shape and direction. So single bonds/double bonds/triple bonds are all treated as single bonds.

Sydni Stewart

State the relative orientations of the following hybrid
orbitals: (a) sp3; (b) sp; (c) sp3d2; (d) sp2.

What is the question asking? Do I just state the number of possible orbitals?

Sydni Stewart

I don't understand exactly how dipoles and polarity are related, can somebody explain this?

Sydni Stewart

For a shape like a tetrahedral or something more complicated, how do we know the angle, is that something that needs to memorized?

Sydni Stewart

Is there certain exceptions to finding electronegativity, like there is when finding ionization energy according to the periodic table?

Sydni Stewart

105085381 wrote:I know we have not needed to yet, but will we need to be able to apply Schrodinger's Equation on the midterm exam?

We won't need to use the equation in a calculation, but make sure you understand it's concept and purpose because anything is fair game for the midterm.

Sydni Stewart

The Quantum World outline says, "With respect to electron transitions that give rise to a UV or visible spectrum: understand the difference between electronic transitions in atomic orbitals (atomic spectroscopy) and electronic transitions in molecular orbitals (molecular spectroscopy)." Wh...

Sydni Stewart

The question asks : Which M2+ ions (where M is a metal) are predicted to have the following ground-state electron configurations: (a) [Ar]3d7; (b) [Ar]3d6; (c) [Kr]4d4; (d) [Kr]4d3? I'm not sure how to go about this question, especially with the d-state exceptions. Can someone show how they solved a...

Sydni Stewart

^^Also very down

Sydni Stewart

Is there any type of indicator that you may have not converted right or messed up somewhere in the equation when calculating velocity? For example should you ever get like 3.4 x 10 ^ -12 m/s as your velocity? Is it possible to be that small?

Sydni Stewart

Is there a reason we use kg in DeBroglie's equation? And in what other equations do we use kg as opposed to grams?

Sydni Stewart

Question: In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line.

How do we know that n1 is equal to 1?

Sydni Stewart

I was wondering if anybody has a study group I could join or is interested in starting one? Let me know

Sydni Stewart

In a question that does not give sig figs, do we just make our own?

Sydni Stewart

1 electron volt is equal to 1.602 x 10^19 joule

Sydni Stewart

Thank you this is very reassuring and encouraging! Can you make a post about your process in applying for Med School sometime in the future?

Sydni Stewart

How are points documented ? Do our TA's check at the end of each week?

Sydni Stewart

Is there a reason a Mol is defined by 12 grams of carbon-12? What is the significance or is it coincidental?

CHEMISTRY COMMUNITY

Search found 33 matches

Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]

Re: 6th edition problem J.15

Re: H2So3

6th edition problem J.15

H2So3

Re: Usage of prefix

Ka and Kb on Final

Re: polarizing power and polarizability

Re: Sigma/pi bond: orbitals

VSEPR Model

Dipole Moments

Final

Pi Bonds

Re: Bond Angles

Review for Final

Re: Drawing structures

Question 4.31 6th Edition

Dipoles and Molarity

Angles of Shapes [ENDORSED]

Electronegativity

Re: Schrodinger's Equation

Difference Between Atomic or Molecular Spectroscopy

6th Edition Problem 3.9

Re: study group at Hedrick Hall

Calculating Velocity

Kg vs Grams

Question 1.15 6th Edition

Study Groups?

Sig Figs

Re: Kiloelectron volt to Joule

Re: Advice from a Medical Student [ENDORSED]

Re: Registering/Creating Your Chemistry Community Account

Mole Definition