Search found 33 matches

by Sydni Stewart
Wed Dec 05, 2018 9:51 pm
Forum: Identifying Acidic & Basic Salts
Topic: 6th edition problem J.15
Replies: 1
Views: 50

Re: 6th edition problem J.15

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 ...
by Sydni Stewart
Wed Dec 05, 2018 9:49 pm
Forum: Bronsted Acids & Bases
Topic: H2So3
Replies: 2
Views: 50

Re: H2So3

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...
by Sydni Stewart
Wed Dec 05, 2018 9:47 pm
Forum: Identifying Acidic & Basic Salts
Topic: 6th edition problem J.15
Replies: 1
Views: 50

6th edition problem J.15

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...
by Sydni Stewart
Wed Dec 05, 2018 8:56 pm
Forum: Bronsted Acids & Bases
Topic: H2So3
Replies: 2
Views: 50

H2So3

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?
by Sydni Stewart
Wed Dec 05, 2018 7:45 pm
Forum: Naming
Topic: Usage of prefix
Replies: 2
Views: 47

Re: Usage of prefix

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

polydentate: bis-, tris-, tetrakis-
by Sydni Stewart
Wed Dec 05, 2018 7:41 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Ka and Kb on Final
Replies: 9
Views: 166

Ka and Kb on Final

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?
by Sydni Stewart
Sun Dec 02, 2018 2:18 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: polarizing power and polarizability
Replies: 5
Views: 90

Re: polarizing power and polarizability

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...
by Sydni Stewart
Sun Dec 02, 2018 2:09 am
Forum: Sigma & Pi Bonds
Topic: Sigma/pi bond: orbitals
Replies: 1
Views: 70

Re: Sigma/pi bond: orbitals

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
by Sydni Stewart
Sun Dec 02, 2018 1:14 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Model
Replies: 5
Views: 56

VSEPR Model

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?
by Sydni Stewart
Sun Nov 25, 2018 2:38 pm
Forum: Student Social/Study Group
Topic: Final
Replies: 12
Views: 279

Final

I know the final is cumulative but does anybody know if it is more focused on topics we have not yet been tested on?
by Sydni Stewart
Sun Nov 25, 2018 9:27 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Pi Bonds
Replies: 1
Views: 51

Pi Bonds

Why exactly do pi bonds break when they're rotated?
by Sydni Stewart
Sun Nov 18, 2018 10:57 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 16
Views: 148

Re: Bond Angles

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...
by Sydni Stewart
Sun Nov 18, 2018 10:51 am
Forum: Administrative Questions and Class Announcements
Topic: Review for Final
Replies: 2
Views: 68

Review for Final

Does anybody know when the Final review sessions begin? Will it be before or after the week 9 test is administered?
by Sydni Stewart
Sun Nov 18, 2018 10:47 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing structures
Replies: 8
Views: 127

Re: Drawing structures

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.
by Sydni Stewart
Thu Nov 15, 2018 5:57 pm
Forum: Hybridization
Topic: Question 4.31 6th Edition
Replies: 1
Views: 33

Question 4.31 6th Edition

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?
by Sydni Stewart
Sun Nov 11, 2018 3:11 am
Forum: Dipole Moments
Topic: Dipoles and Molarity
Replies: 2
Views: 106

Dipoles and Molarity

I don't understand exactly how dipoles and polarity are related, can somebody explain this?
by Sydni Stewart
Sun Nov 11, 2018 3:08 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Angles of Shapes [ENDORSED]
Replies: 4
Views: 150

Angles of Shapes [ENDORSED]

For a shape like a tetrahedral or something more complicated, how do we know the angle, is that something that needs to memorized?
by Sydni Stewart
Sun Nov 11, 2018 2:55 am
Forum: Electronegativity
Topic: Electronegativity
Replies: 8
Views: 190

Electronegativity

Is there certain exceptions to finding electronegativity, like there is when finding ionization energy according to the periodic table?
by Sydni Stewart
Thu Nov 01, 2018 1:29 am
Forum: *Shrodinger Equation
Topic: Schrodinger's Equation
Replies: 6
Views: 271

Re: Schrodinger's Equation

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.
by Sydni Stewart
Thu Nov 01, 2018 1:19 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Difference Between Atomic or Molecular Spectroscopy
Replies: 2
Views: 913

Difference Between Atomic or Molecular Spectroscopy

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...
by Sydni Stewart
Wed Oct 31, 2018 1:15 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 6th Edition Problem 3.9
Replies: 1
Views: 60

6th Edition Problem 3.9

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...
by Sydni Stewart
Sun Oct 28, 2018 9:08 pm
Forum: Student Social/Study Group
Topic: study group at Hedrick Hall
Replies: 4
Views: 99

Re: study group at Hedrick Hall

^^Also very down
by Sydni Stewart
Sat Oct 27, 2018 5:08 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Calculating Velocity
Replies: 4
Views: 109

Calculating Velocity

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?
by Sydni Stewart
Sat Oct 27, 2018 5:01 pm
Forum: DeBroglie Equation
Topic: Kg vs Grams
Replies: 6
Views: 172

Kg vs Grams

Is there a reason we use kg in DeBroglie's equation? And in what other equations do we use kg as opposed to grams?
by Sydni Stewart
Mon Oct 22, 2018 8:47 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Question 1.15 6th Edition
Replies: 1
Views: 33

Question 1.15 6th Edition

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?
by Sydni Stewart
Sun Oct 14, 2018 12:50 pm
Forum: Student Social/Study Group
Topic: Study Groups?
Replies: 1
Views: 67

Study Groups?

I was wondering if anybody has a study group I could join or is interested in starting one? Let me know
by Sydni Stewart
Sun Oct 14, 2018 12:44 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs
Replies: 8
Views: 252

Sig Figs

In a question that does not give sig figs, do we just make our own?
by Sydni Stewart
Sun Oct 14, 2018 12:42 pm
Forum: SI Units, Unit Conversions
Topic: Kiloelectron volt to Joule
Replies: 5
Views: 195

Re: Kiloelectron volt to Joule

1 electron volt is equal to 1.602 x 10^19 joule
by Sydni Stewart
Fri Oct 05, 2018 12:51 am
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 96
Views: 29505

Re: Advice from a Medical Student [ENDORSED]

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?
by Sydni Stewart
Fri Oct 05, 2018 12:45 am
Forum: Administrative Questions and Class Announcements
Topic: Registering/Creating Your Chemistry Community Account
Replies: 17
Views: 15600

Re: Registering/Creating Your Chemistry Community Account

How are points documented ? Do our TA's check at the end of each week?
by Sydni Stewart
Wed Oct 03, 2018 10:51 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Mole Definition
Replies: 5
Views: 102

Mole Definition

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

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