Search found 34 matches

by Daniela Alvarado 3B
Sat Dec 08, 2018 6:33 pm
Forum: Administrative Questions and Class Announcements
Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Replies: 118
Views: 4409

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

for #24, why can't we find the oxidation state of Fe by finding the nitrogen' formal charges while attached?

Thanks in advance!
by Daniela Alvarado 3B
Wed Dec 05, 2018 11:43 pm
Forum: Lewis Acids & Bases
Topic: BaO a Lewis acid ?
Replies: 3
Views: 69

BaO a Lewis acid ?

Question 12.17 on the hw states BaO is a Lewis acid. How do we come to that conclusion? Is it because in the lewis structure O has 2 lone pairs of e- ? If so, then is it safe to say that even when we have a neutral molecule, if it has lone pairs we consider it a base that donates e-?
by Daniela Alvarado 3B
Wed Dec 05, 2018 10:39 pm
Forum: Amphoteric Compounds
Topic: homework question 12.11
Replies: 1
Views: 33

homework question 12.11

The solutions manual doesn't specify, so I was wondering if when they list the acids and bases, they're listing the conjugate acid-base pairs as
"ACID conjugate base, BASE conjugate acid?"
by Daniela Alvarado 3B
Wed Dec 05, 2018 3:24 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calc pH
Replies: 1
Views: 39

Calc pH

I’m a bit confused as to if we need to know how to calculate the pH of a weak acid solution. I thought Professor Lavelle said we didn’t, but on the practice probs, box 12.1 is listed and that gives steps on how to find the pH of weak acid solution. Also, exactly what calculations from chapter 12 mus...
by Daniela Alvarado 3B
Sun Dec 02, 2018 8:06 pm
Forum: Lewis Acids & Bases
Topic: 6th editions Fundamentals J #1
Replies: 3
Views: 46

6th editions Fundamentals J #1

can anyone explain why in part d. H2SO3 is an acid? and why in part e. Ca(OH)2 is a base? Thanks in advance.
by Daniela Alvarado 3B
Sun Dec 02, 2018 4:50 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Number
Replies: 10
Views: 92

Re: Coordination Number

Earlier today someone some one told me that the coordination number was the number of DIFFERENT bonds which threw me off. But what I'm seeing here is that when we have 3 of the SAME atoms bound to a central atom, the coordination # is still 3, right?
by Daniela Alvarado 3B
Sun Dec 02, 2018 4:46 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: Transition Metals
Replies: 5
Views: 134

Re: Transition Metals

this is what if found online lol "Transition metals can have multiple oxidation states because of their electrons. The transition metals have several electrons with similar energies, so one or all of them can be removed, depending the circumstances. This results in different oxidation states.&q...
by Daniela Alvarado 3B
Sun Dec 02, 2018 4:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular shape in relation to polarity and boiling point
Replies: 5
Views: 75

Re: Molecular shape in relation to polarity and boiling point

I believe that if the molecule is polar then it has a higher boiling point than something that is non-polar. But when comparing 2 polar molecules' boiling points it is important to recognize what forces are present (hydrogen bonding, LFD, Dipole-dipole) and the one with more forces present has a hig...
by Daniela Alvarado 3B
Sun Nov 25, 2018 6:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 6th edition 4.13
Replies: 3
Views: 63

Re: 6th edition 4.13

I have a question on part d for this problem. I drew the Lewis structure and placed two lone pairs on the O so that all atoms would have a formal charge of 0. As a result I thought the molecular shape would be bent do the repelling of the lone pairs; however, the solution manual says it’s linear. Wh...
by Daniela Alvarado 3B
Sat Nov 24, 2018 7:29 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge on atom w/ expanded valence shell
Replies: 1
Views: 80

Formal charge on atom w/ expanded valence shell

If we have for example XeF4 (ch. 3.65 6th ed), the formal charge on Xe is zero; however, when we’re looking at the bond pairs and lone pairs there’s 12 electrons around the Xe. Will the charge for atoms w expanded valence shells always be 0?
by Daniela Alvarado 3B
Tue Nov 20, 2018 12:31 pm
Forum: Student Social/Study Group
Topic: Lavelle office hours (week of thanksgiving break)
Replies: 1
Views: 90

Lavelle office hours (week of thanksgiving break)

Will Lavelle still have O.H. this Wednesday even though we don’t have class? Or are O.H. Cancelled too?
by Daniela Alvarado 3B
Sun Nov 18, 2018 11:00 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: AXE formula
Replies: 18
Views: 627

Re: AXE formula

Enzo_1I wrote:From what i understand it is necessary to know the shape that corresponds to the formula. This means memorizing which formulas are associated to which shape.


do you happen to know if theres anyway to know the corresponding shape aside form the AXE formula? or must we memorize those too?
by Daniela Alvarado 3B
Sun Nov 18, 2018 10:57 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Shape and Boiling Point
Replies: 10
Views: 237

Re: Shape and Boiling Point

What is the relationship between shape and boiling point? Like I know if it's rod-shaped there's a stronger interaction because of the larger distance, but what does that have to do with its higher boiling point? the way I think of it is that when 2 rod shape molecules interact the shape allows the...
by Daniela Alvarado 3B
Sun Nov 18, 2018 10:47 pm
Forum: Resonance Structures
Topic: Bond Lengths
Replies: 6
Views: 156

Re: Bond Lengths

when we draw all possible resonance structures are we required to draw the hybrid with the dashed lines? or is it okay to draw the double headed arrow between the different resonance structures?
by Daniela Alvarado 3B
Sat Nov 10, 2018 6:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming the shape
Replies: 6
Views: 184

Re: Naming the shape

in class when Lavelle showed us the tetrahedral, why couldn't we put a bond at the bottom? how does putting the last bond pointing toward us affect the atom?
by Daniela Alvarado 3B
Sat Nov 10, 2018 5:59 pm
Forum: Lewis Structures
Topic: polyatomic ions
Replies: 2
Views: 54

polyatomic ions

how exactly do we draw these? do we add/ subtract valence electrons (based on the charge given in the chemical formula), and just add a bracket and charge? or is there something else we must do?
by Daniela Alvarado 3B
Sat Nov 10, 2018 5:55 pm
Forum: Resonance Structures
Topic: Bond Lengths
Replies: 6
Views: 156

Re: Bond Lengths

Does the bond length change depending on where the double bond is in the resonance structures?
by Daniela Alvarado 3B
Sun Nov 04, 2018 12:35 pm
Forum: Lewis Structures
Topic: 3.39
Replies: 1
Views: 34

3.39

Should we know what the chemical formula of a compound is just by looking at the name? For example knowing that potassium phosphate is K3PO4 (chapter 3 #29 6th edition?)
by Daniela Alvarado 3B
Sat Nov 03, 2018 5:40 pm
Forum: *Particle in a Box
Topic: Midterm
Replies: 14
Views: 516

Re: Midterm

WHERE IS LAST YEARS MIDTERM?...
by Daniela Alvarado 3B
Sat Nov 03, 2018 5:38 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 5
Views: 68

Re: Electron Affinity

Can someone explain why C has a higher electron affinity than N in more detail plz? It’s confusing having said that N is closer to the right of the periodic table...
by Daniela Alvarado 3B
Sat Nov 03, 2018 1:42 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ground state
Replies: 2
Views: 34

Re: Ground state

Yeah I have a follow up question...looking at 2.39 6th edition, how can we tell if an electron configuration is in ground state or excited state?
by Daniela Alvarado 3B
Sat Nov 03, 2018 1:33 pm
Forum: Quantum Numbers and The H-Atom
Topic: degeneracy of the a 4p orbital
Replies: 9
Views: 220

Re: degeneracy of the a 4p orbital

Since it’s 4p, we know p has 1 subshell (l=1), that subshell has 3 orbitals and all those orbitals will have the same energy level
by Daniela Alvarado 3B
Sat Oct 27, 2018 9:08 pm
Forum: Lewis Structures
Topic: Electron Configuration
Replies: 4
Views: 78

Re: Electron Configuration

also, if I isn't specified its found by all the numbers until n-1

ex// If n=3 then I=0,1,2 (2 is the las one because n-1) and M subscript I= -I,i=I-1,I
by Daniela Alvarado 3B
Sat Oct 27, 2018 9:04 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: nodal planes for d-orbitals
Replies: 3
Views: 73

Re: nodal planes for d-orbitals

what exactly do the nodal planes help us figure out?
by Daniela Alvarado 3B
Sat Oct 27, 2018 9:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 11
Views: 165

Re: Midterm

fundamentals till week 5 Friday, I believe.
by Daniela Alvarado 3B
Sat Oct 20, 2018 6:26 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Series and Wavelengths
Replies: 4
Views: 61

Re: Series and Wavelengths

How exactly does the model demonstrate that though? For example, is going from The first line on the left to one on the right an increase in N or something?
by Daniela Alvarado 3B
Sat Oct 20, 2018 1:49 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: energy difference vs. E subscript n
Replies: 2
Views: 61

energy difference vs. E subscript n

are energy difference (delta E) & E subscript n used interchangeably? what exactly is E subscript n?
by Daniela Alvarado 3B
Tue Oct 16, 2018 12:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Got my homework back no grade
Replies: 1
Views: 42

Got my homework back no grade

Hello,
I turned in hw #2 last week in discussion and got it back today, however there’s no score on it...so how do I determine my score?
by Daniela Alvarado 3B
Fri Oct 12, 2018 7:22 pm
Forum: Properties of Light
Topic: problem 1. 9 sixth edition
Replies: 4
Views: 47

Re: problem 1. 9 sixth edition

can anybody explain the procedure for the 4th row ? plz I kept getting a couple digits off...
by Daniela Alvarado 3B
Fri Oct 12, 2018 7:18 pm
Forum: DeBroglie Equation
Topic: Measurable wave length properties
Replies: 3
Views: 47

Measurable wave length properties

In the worked example presented in lecture today when asked if the car has any measurable wave like properties, what exactly helps determine if the answer is yes or no after finding the wavelength?
by Daniela Alvarado 3B
Mon Oct 08, 2018 3:10 pm
Forum: Empirical & Molecular Formulas
Topic: Going from empirical to Molecular formula
Replies: 14
Views: 375

Going from empirical to Molecular formula

When trying to find the molecular formula & we put the molar mass of molecular formula over the mass of the empirical formula we found, is the number supposed to be a whole # or can it be like 1.23? If it can be 1.23, do we round when we multiply it by the subscript of the elements in empirical ...
by Daniela Alvarado 3B
Thu Oct 04, 2018 11:04 pm
Forum: SI Units, Unit Conversions
Topic: Scientific Notation
Replies: 11
Views: 163

Re: Scientific Notation

Most of the final answers I’ve seen are in scientific notation so I was thinking we actually might have to
by Daniela Alvarado 3B
Thu Oct 04, 2018 10:37 pm
Forum: Molarity, Solutions, Dilutions
Topic: HW L1
Replies: 3
Views: 54

Re: HW L1

Hey i didn’t do that problem but I think u could check ur answer in the back of the book since it’s an odd #
by Daniela Alvarado 3B
Wed Oct 03, 2018 1:47 pm
Forum: Empirical & Molecular Formulas
Topic: When to double moles
Replies: 13
Views: 153

Re: When to double moles

Yeah I believe if it’s off and multiplying it will make only make it off by less than .05 then that’s when you multiply it, but all 3 numbers have to be super close to a whole #

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