Search found 31 matches

by leediane0916
Sun Dec 02, 2018 4:40 pm
Forum: Hybridization
Topic: lone pairs
Replies: 20
Views: 154

Re: lone pairs

the lone pair counts as one electron density so you have to consider it!
by leediane0916
Sun Dec 02, 2018 4:38 pm
Forum: Administrative Questions and Class Announcements
Topic: Final [ENDORSED]
Replies: 5
Views: 123

Re: Final [ENDORSED]

I’m pretty sure Dr. Lavelle and the UAs have study and review sessions planned because my TA posted about one during dicussion on the board last week
by leediane0916
Sun Dec 02, 2018 4:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Model
Replies: 5
Views: 48

Re: VSEPR Model

i think he means using the AXE formula and determining the shape!
by leediane0916
Sun Nov 25, 2018 9:03 pm
Forum: Hybridization
Topic: Octet Expansion
Replies: 6
Views: 68

Re: Octet Expansion

up to period 2 elements, the electrons can only fill s and p orbitals which is why they can only pair up to 8 electrons. but starting from period 3, there is a d orbital that goes beyond just the s and p orbital which is why if the first two subshells are full, electrons can fill the d subshell, cre...
by leediane0916
Sun Nov 25, 2018 9:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: e- Density
Replies: 4
Views: 46

Re: e- Density

although the single, double, triple bonds have different orders and strengths, they still represent one type of interaction between two atoms so it counts as one!
by leediane0916
Sun Nov 25, 2018 9:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam
Replies: 22
Views: 302

Re: Final Exam

from what i've heard the final covers mostly from week 6 to the end but is still cumulative!
by leediane0916
Sat Nov 17, 2018 3:10 pm
Forum: Sigma & Pi Bonds
Topic: usage of sigma/pi
Replies: 6
Views: 137

usage of sigma/pi

if we know what bond contains sigma/pi bonds, what are some usage of these bonds? like what can we calculate about the bond/molecule using the number of sigma and pi bonds?
by leediane0916
Sat Nov 17, 2018 3:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: hybridization for VSEPR
Replies: 1
Views: 25

hybridization for VSEPR

when we try to determine the shape of a given molecule, do we also have to know the hybridization of it or can we just look at the bonded electrons and lone pairs and figure it out?
by leediane0916
Sat Nov 17, 2018 3:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 3
Replies: 19
Views: 231

Re: Test 3

in our discussion our TA went over a total of 10? shapes and I think that's all we need to know
by leediane0916
Thu Nov 08, 2018 5:15 pm
Forum: Sigma & Pi Bonds
Topic: sigma/pi bonds and bond order
Replies: 2
Views: 104

sigma/pi bonds and bond order

how do we use sigma/pi bonds to calculate bond order? (or bond length???)
by leediane0916
Thu Nov 08, 2018 5:14 pm
Forum: Octet Exceptions
Topic: Octet
Replies: 6
Views: 84

Re: Octet

the elements starting group 3 can contain more than 8 electrons because the d-orbital is added, meaning that more than 8 electrons can bind to these atoms!
by leediane0916
Thu Nov 08, 2018 5:12 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge & Stable lewis structures
Replies: 6
Views: 83

Re: Formal Charge & Stable lewis structures

the formal charges need to add up to the charge of the entire molecule but the most stable structure is the one where the most atoms contain a FC =0
by leediane0916
Sun Nov 04, 2018 6:31 pm
Forum: Ionic & Covalent Bonds
Topic: bond order
Replies: 2
Views: 59

bond order

what exactly is bond order? would we have to know it for the test?
by leediane0916
Sat Nov 03, 2018 9:48 pm
Forum: Lewis Structures
Topic: lewis acid/base
Replies: 3
Views: 24

lewis acid/base

how do you determine what is a lewis acid and what is a lewis base?
by leediane0916
Sat Nov 03, 2018 9:25 pm
Forum: Ionic & Covalent Bonds
Topic: determining bond strength
Replies: 3
Views: 48

determining bond strength

how exactly do we determine bond strength? for example trying to find if C2+ or C2 has a stronger bond?
by leediane0916
Tue Oct 30, 2018 8:54 pm
Forum: Lewis Structures
Topic: determining double bonds
Replies: 2
Views: 29

determining double bonds

in molecules like ONF, we know that we need a double bond and the central atom is N but how do we determine if that double bond should be made between O-N or O-F?
by leediane0916
Tue Oct 30, 2018 7:43 pm
Forum: Lewis Structures
Topic: bond length
Replies: 2
Views: 36

bond length

when we draw our lewis structures, does dr lavelle want us to indicate that triple double single bonds have different bond lengths or can they all just be the same length?
by leediane0916
Tue Oct 30, 2018 3:04 pm
Forum: Octet Exceptions
Topic: central atoms with more than 4 bonds
Replies: 3
Views: 78

central atoms with more than 4 bonds

yesterday in class dr lavelle drew the SO4 2- atom's lewis structure and said that it is most accurate when the central atom (s) has two double bonds and two single bonds, which represents 12 electrons - how does that work?
by leediane0916
Tue Oct 30, 2018 3:02 pm
Forum: Student Social/Study Group
Topic: midterm
Replies: 1
Views: 67

midterm

where can we find where we take our midterm next monday? is it in cs24?
by leediane0916
Tue Oct 30, 2018 3:01 pm
Forum: Electronegativity
Topic: electronegativity in lewis structures
Replies: 2
Views: 72

electronegativity in lewis structures

so when we draw the lewis structures the central atom is the one with the least electronegativity? if so, is there a specific reason?
by leediane0916
Sat Oct 27, 2018 9:40 pm
Forum: Trends in The Periodic Table
Topic: effective nuclear charge
Replies: 1
Views: 34

effective nuclear charge

can someone define the effective nuclear charge and how it affects electron affinity and/or electronegativity?
by leediane0916
Mon Oct 22, 2018 8:22 pm
Forum: DeBroglie Equation
Topic: wavelike properties
Replies: 4
Views: 111

wavelike properties

When problems ask you if your object (ie. car) has measurable wavelike properties, what it is asking me to identify/decide?
by leediane0916
Wed Oct 17, 2018 12:06 am
Forum: Ionic & Covalent Bonds
Topic: Electron Configuration of Cations
Replies: 8
Views: 147

Re: Electron Configuration of Cations

you decide how many electrons to remove depending on the charge on the cation!
by leediane0916
Wed Oct 17, 2018 12:05 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Negative Signs
Replies: 2
Views: 48

Re: Negative Signs

the E resulting from this equation should be negative because you are going from a higher E level to a lower E level, during which E is given off as light, so the loss of E as photons are expressed through the negative sign
by leediane0916
Wed Oct 17, 2018 12:04 am
Forum: Properties of Light
Topic: Expected to know?
Replies: 6
Views: 91

Re: Expected to know?

I think we just need to know the specific range for visible light, and just the order in which the categories range along the spectrum!
by leediane0916
Wed Oct 10, 2018 8:44 pm
Forum: Limiting Reactant Calculations
Topic: Percent Yield [ENDORSED]
Replies: 13
Views: 340

Re: Percent Yield [ENDORSED]

in these problems the actual yield should be given (because you can't conduct the experiment by yourself and figure that value out) and the theoretical yield is the amount of the product that you deduce from the given equation!
by leediane0916
Wed Oct 10, 2018 8:43 pm
Forum: Molarity, Solutions, Dilutions
Topic: Changing Units
Replies: 10
Views: 219

Re: Changing Units

If the units are specified in the question, you should use that unit but otherwise, I think Professor said you could do either!
by leediane0916
Wed Oct 10, 2018 8:42 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Threshold Energy
Replies: 4
Views: 43

Re: Threshold Energy

Threshold Energy is the minimum required amount of E that a photon should contain for the photon to release an electron from the metal surface. The threshold E + E of the electron is equal to the E of the photon. As explained in the lecture, if the electron's E is 0, that means that the photon's E w...
by leediane0916
Fri Oct 05, 2018 12:24 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: answer accuracy
Replies: 4
Views: 76

answer accuracy

When I solve problems I don’t round until the very end and keep all my sigfigs but sometimes the answer I get is 0.01-0.02 digits different from the one in the solution manual. Will this be a big problem on the homework/test?
by leediane0916
Thu Oct 04, 2018 5:09 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 6
Views: 93

Re: Sig Figs

I think if the question starts off with 3 sigfigs you need to include the . at the end of 400 (400.) to make it 3 sigfigs and follow the rules!
by leediane0916
Thu Oct 04, 2018 5:07 pm
Forum: SI Units, Unit Conversions
Topic: units during dimensional analysis
Replies: 4
Views: 75

units during dimensional analysis

I do know that it is easier and less confusing if we write down and cancel out all of our units when calculating with dimensional analysis but does this also apply to when we're using the Avogadros number or any other dimension in the future that contains complicated units?

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