Search found 45 matches

by KBELTRAMI_4I
Wed Nov 13, 2019 5:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sulfur Hexafluoride VSEPR
Replies: 3
Views: 14

Re: Sulfur Hexafluoride VSEPR

Kate Osborne 1B wrote:Octahedral shape describes a compound with 6 shared pairs of electrons and since there are 6 bonds in SF6 it is octahedral.


the term is just misleading
by KBELTRAMI_4I
Wed Nov 13, 2019 5:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Class grading
Replies: 12
Views: 149

Re: Class grading

it says on the syllabus that 50% in the class is a C-, is this true?
by KBELTRAMI_4I
Wed Nov 13, 2019 5:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Exam 2
Replies: 3
Views: 24

Re: Exam 2

does it include the midterm topics?
by KBELTRAMI_4I
Wed Nov 13, 2019 5:42 pm
Forum: SI Units, Unit Conversions
Topic: Memorizing Conversions
Replies: 15
Views: 103

Re: Memorizing Conversions

id say just memorize everything you can!
by KBELTRAMI_4I
Wed Nov 13, 2019 5:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Week 9 homework
Replies: 6
Views: 35

Re: Week 9 homework

Katherine Chhen 3I wrote:Since week 9 is thanksgiving break and I have discussion on Thursday, would homework still be due for that week?


maybe the monday after? let us know if u find out!
by KBELTRAMI_4I
Wed Nov 13, 2019 5:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Linear VSEPR model
Replies: 11
Views: 36

Re: Linear VSEPR model

So the number of lone pairs can also determine the molecular shape of a molecule? Yes, lone pairs can influence the molecular shape of a molecule but as mentioned by the previous responses we have not gone over it yet. However, to have an idea of some examples I provided an image below that shows y...
by KBELTRAMI_4I
Wed Nov 13, 2019 5:39 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Linear VSEPR model
Replies: 11
Views: 36

Re: Linear VSEPR model

I know that when the central atom has only two bonding pairs as far as possible, forming an 180 degree angle, it is considered to be a linear shape, but what if the central atom has lone pairs in addition to the two bonds? I was also confused about this in the homework, I think it depends on the an...
by KBELTRAMI_4I
Wed Nov 13, 2019 5:39 pm
Forum: Lewis Structures
Topic: Curiosity
Replies: 5
Views: 43

Re: Curiosity

Yeah, hi, just wondering if anyone would give any tips on how to draw the Lewis Structure for the chemical compound mentioned in 3F1c. H2SeO4... The problem never asked for the Lewis structure, but I'm just asking out of curiousity's sake:) (and plus, it'd probably really help to find the solution,...
by KBELTRAMI_4I
Wed Nov 13, 2019 5:38 pm
Forum: Lewis Structures
Topic: Curiosity
Replies: 5
Views: 43

Re: Curiosity

Yeah, hi, just wondering if anyone would give any tips on how to draw the Lewis Structure for the chemical compound mentioned in 3F1c. H2SeO4... The problem never asked for the Lewis structure, but I'm just asking out of curiousity's sake:) (and plus, it'd probably really help to find the solution,...
by KBELTRAMI_4I
Wed Nov 13, 2019 5:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR model angles
Replies: 7
Views: 24

Re: VSEPR model angles

at least be able to figure them out conceptually if asked. 360/3 planes = 120 is how I think of it but make it the avg
by KBELTRAMI_4I
Wed Nov 13, 2019 5:36 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 7
Views: 25

Re: Formal Charge

705198479 wrote:when is will we know to calculate a formal charge, will it be noticeable in the question or are there key words


do it when drawing lewis structures
by KBELTRAMI_4I
Wed Nov 13, 2019 5:35 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 7
Views: 25

Re: Formal Charge

try to calculate the lowest charges overall...

#of electrons in valence shell - [# of electrons in lone pairs + (# bonded electrons/2)]
by KBELTRAMI_4I
Wed Nov 13, 2019 5:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Memorization
Replies: 13
Views: 56

Re: Memorization

but for the names, i think so
by KBELTRAMI_4I
Wed Nov 13, 2019 5:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Memorization
Replies: 13
Views: 56

Re: Memorization

you should be able to figure them out by conceptualizing them
by KBELTRAMI_4I
Wed Nov 13, 2019 5:32 pm
Forum: Empirical & Molecular Formulas
Topic: empirical = molecular?
Replies: 14
Views: 99

Re: empirical = molecular?

If the questions asks to find the molecular and empirical formula, first try to find the empirical formula which is to covert the grams into moles that’s given for each element. Then divide each element by the smallest mole value (for empirical). Remember that the coefficient can only be a whole in...
by KBELTRAMI_4I
Wed Nov 13, 2019 5:31 pm
Forum: Bond Lengths & Energies
Topic: Bond lengths in molecules
Replies: 7
Views: 28

Re: Bond lengths in molecules

Bonds are longer or shorter depending on the distance between the two atoms. If there are multiple bonds, there are more shared electrons, so the atoms are more closely held together and the bonds are shorter. Also, if the atoms are smaller they can be closer together, so smaller atoms also make sh...
by KBELTRAMI_4I
Thu Oct 31, 2019 1:06 pm
Forum: Lewis Structures
Topic: Drawing lewis structures
Replies: 8
Views: 41

Re: Drawing lewis structures

it doesn't matter until we cover shaping
by KBELTRAMI_4I
Thu Oct 31, 2019 1:06 pm
Forum: Dipole Moments
Topic: van der waal
Replies: 4
Views: 44

Re: van der waal

are we supposed to know this already???
by KBELTRAMI_4I
Thu Oct 31, 2019 1:05 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 2
Views: 26

Re: Midterm

its everything until section 2D??? of bonds
by KBELTRAMI_4I
Thu Oct 31, 2019 12:44 pm
Forum: Lewis Structures
Topic: Creating Lewis Structures
Replies: 7
Views: 47

Re: Creating Lewis Structures

the middle one is the one that creates the most bonds, and also its normally always carbon if carbon is one of the elements. oxygen and sulfur are also typical centered.
by KBELTRAMI_4I
Thu Oct 31, 2019 12:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Study Tips!
Replies: 7
Views: 31

Re: Study Tips!

make your own graphic organizer!! Use formulas as main headlines and write a checklist of things you know and things you don't know.
by KBELTRAMI_4I
Wed Oct 23, 2019 11:27 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Spin Quantum Number
Replies: 6
Views: 22

Re: Spin Quantum Number

Parker Smith wrote:the +1/2 and the -1/2 are used to signify the spin of the electron. So if you are only drawing the arrows, you probably don't need to use the ms numbers because the arrows signify spin direction already. It depends on what the problem asks of you.


how do you know which direction it goes though?
by KBELTRAMI_4I
Wed Oct 23, 2019 11:26 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sonia Week 4 Worksheet
Replies: 2
Views: 41

Re: Sonia Week 4 Worksheet

Thank you for sharing!
by KBELTRAMI_4I
Wed Oct 23, 2019 11:26 am
Forum: Quantum Numbers and The H-Atom
Topic: 1D. 23)
Replies: 5
Views: 42

Re: 1D. 23)

On problem 1D.23 I am having trouble. How do I begin to know how many orbitals can have the following quantum numbers in an atom? The concept, in general, confuses me, not just this specific question. I believe we went over it in class. I would check google images for a diagram to be sure of the nu...
by KBELTRAMI_4I
Wed Oct 23, 2019 11:24 am
Forum: DeBroglie Equation
Topic: Velocity
Replies: 12
Views: 61

Re: Velocity

If we calculate a velocity for an electron, proton or neutron that is higher than the speed of light, should we assume we did something wrong, or is there possibility for this to be an answer and we have to say that this is "unreasonable?" I think we did an example problem like this, I do...
by KBELTRAMI_4I
Wed Oct 23, 2019 11:22 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Atomic Radius
Replies: 18
Views: 84

Re: Atomic Radius

Tai Metzger 3K wrote:In general, the periodic table has the following trends for atomic radius:
As you move down a column, atomic radius increases.
As you move from left to right along a row, the atomic radius decreases.


Do we need to know the exact number though?
by KBELTRAMI_4I
Fri Oct 18, 2019 4:21 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Hund's Rule
Replies: 4
Views: 28

Re: Hund's Rule

Suraj Doshi 1L wrote:Can an two electrons within the same subshell have different energies associated with them?


I thought he said something like this in class, but I don't know.
by KBELTRAMI_4I
Fri Oct 18, 2019 4:20 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: wave functions/orbitals/quantum numbers
Replies: 2
Views: 25

Re: wave functions/orbitals/quantum numbers

Ashley Tran 4B wrote:How are wave functions/orbitals connected to quantum numbers? I'm confused... isn't the wave function about the whole atom and the quantum number refers to individual electrons?


Not electrons but photons.
by KBELTRAMI_4I
Fri Oct 18, 2019 4:19 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: wave functions/orbitals/quantum numbers
Replies: 2
Views: 25

Re: wave functions/orbitals/quantum numbers

I'm not sure about quantum numbers specifically, but it all just represents the behavior of photons in different scenarios.
by KBELTRAMI_4I
Fri Oct 18, 2019 4:17 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron configuration with s and d subshells
Replies: 4
Views: 21

Re: Electron configuration with s and d subshells

Isn't there an exception? I'm also confused.
by KBELTRAMI_4I
Fri Oct 18, 2019 4:16 pm
Forum: *Black Body Radiation
Topic: Will this concept be tested
Replies: 8
Views: 404

Re: Will this concept be tested

Which concept are you talking about?
by KBELTRAMI_4I
Fri Oct 18, 2019 4:15 pm
Forum: Einstein Equation
Topic: HW 1B. 7
Replies: 6
Views: 70

Re: HW 1B. 7

First use the E=hc/wavelength formula to find the energy. Then, multiply that my the mols of Na and avagadros number to get the energy for 5g of Na. After that, multiple avagadros number to the number you calculated in part a to find the energy for 1mol of Na. So avogadro's number is how you get it...
by KBELTRAMI_4I
Fri Oct 18, 2019 4:14 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Spin State
Replies: 17
Views: 59

Re: Spin State

Let's talk about spin. What is even going on and how do we know if it's positive or negative?
by KBELTRAMI_4I
Fri Oct 11, 2019 3:32 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 61
Views: 18467

Re: Final Jitters

I have this issue and it happened today for a quiz. Honestly just think of it of an assessment of how much you know and try not to anticipate questions having the purpose of confusing you. If you know things, you have the opportunity to demonstrate it. I wish I would have thought of it this way.
by KBELTRAMI_4I
Fri Oct 11, 2019 3:30 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Reactions
Replies: 20
Views: 135

Re: Balancing Chemical Reactions

I'm still having some difficulty balancing equations that require more than just inspection. Is there another, possibly longer but more accurate method to balancing "harder" chemical reactions. For example: Cu + HNO3 → Cu(NO3)2 + NO + H2O All I know is you should start with the least freq...
by KBELTRAMI_4I
Fri Oct 11, 2019 3:28 pm
Forum: DeBroglie Equation
Topic: When to use DeBroglie Equation
Replies: 16
Views: 101

Re: When to use DeBroglie Equation

Doesn't it have to do with when there is a quantifiable mass given and there are wave-like and particle-like properties both?
by KBELTRAMI_4I
Fri Oct 11, 2019 3:27 pm
Forum: Student Social/Study Group
Topic: Study Tips
Replies: 44
Views: 314

Re: Study Tips

Drake Choi_1I wrote:Is it a good idea to review online modules before lectures so that I can be familiar with what is going to be lectured on? Or should I review after I have had the lecture? Thank you :)


YES this is what helps me the most!
by KBELTRAMI_4I
Fri Oct 11, 2019 3:26 pm
Forum: Student Social/Study Group
Topic: Study Tips
Replies: 44
Views: 314

Re: Study Tips

I'm really in need of tips for how to stay disciplined while studying rather than getting distracted after five minutes and giving up!!!
by KBELTRAMI_4I
Fri Oct 11, 2019 10:14 am
Forum: Administrative Questions and Class Announcements
Topic: Posting
Replies: 3
Views: 24

Re: Posting

I don't know either! And what is the password for Prof Lavelle's website!!
by KBELTRAMI_4I
Tue Oct 01, 2019 3:51 pm
Forum: Limiting Reactant Calculations
Topic: HW problem L1
Replies: 3
Views: 28

HW problem L1

To find the amt of Br2 that can be obtained from .3mol ClO2 via the following equation... 6ClO2 (g) + 2BrF3 (l) ----> 6ClO2F (s) + Br2 (l) (balanced) 6{.3mol ClO2 (g)] + 2BrF3 (l) -----> 6ClO2F (s) + Br2 (l) there is a 6 : 2 ratio of the reactants... can someone help me to solve this step by step? o...
by KBELTRAMI_4I
Sun Sep 29, 2019 3:58 pm
Forum: Empirical & Molecular Formulas
Topic: Homework Problem E.9
Replies: 4
Views: 64

Re: Homework Problem E.9

To find the number of oxygen atoms, you must first find the number of moles in 5.15g of epsom salt. This can be found by dividing the given mass (5.15g) by the molar mass (246.3g/mol), which leaves you with 0.0209 moles of epsom salt. From here, you must use the mole ratio of oxygen to epsom salt i...
by KBELTRAMI_4I
Sun Sep 29, 2019 3:56 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formulas Rounding and Multiplying
Replies: 11
Views: 122

Re: Empirical Formulas Rounding and Multiplying

105335337 wrote:I personally feel like the general rule of thumb for round should include only integers ending in 0.5 or 0.33. Anything else, can either be rounded up or down.
For example: If your result is a number that is 2.55, obviously round that to just 2.5.


For the sake of multiplication right?
by KBELTRAMI_4I
Sun Sep 29, 2019 3:55 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formulas Rounding and Multiplying
Replies: 11
Views: 122

Re: Empirical Formulas Rounding and Multiplying

I agree with the other user that the amounts should be leaning towards a value usch as 0.5 or 0.33. In addition, I would like to add that each step of the way to use the correct sig figs because this personally has helped me to find values that I can see where to round to more so. In many situation...
by KBELTRAMI_4I
Sun Sep 29, 2019 3:52 pm
Forum: Administrative Questions and Class Announcements
Topic: Formatting homework
Replies: 12
Views: 138

Re: Formatting homework

How are you all organizing you work? I'm a first year and unsure of how to maximize my organizational potential for each class.
by KBELTRAMI_4I
Sun Sep 29, 2019 3:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 61
Views: 53650

Re: Tutoring? [ENDORSED]

Does anyone know of any good tutors for the first quarter of 2019 for Chem 14A?

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