Search found 30 matches
- Sun Jun 03, 2018 11:21 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: coordination number vs. oxidation number [ENDORSED]
- Replies: 4
- Views: 1132
Re: coordination number vs. oxidation number [ENDORSED]
Oxidation number is how many electrons an atom will lose during bonding and the coordination number refers to the number of regions of electron density surrounding the central atom in a compound.
- Sun Jun 03, 2018 11:17 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond angles [ENDORSED]
- Replies: 3
- Views: 487
Re: Bond angles [ENDORSED]
The presence of lone pairs will cause all the bond angles in the atom to be slightly smaller than their original size, however we are not responsible for knowing how much the repulsion will affect this. We only need to know that the lone pairs make the bonds smaller.
- Sun Jun 03, 2018 11:15 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Question 4.29 [ENDORSED]
- Replies: 4
- Views: 446
Re: Question 4.29 [ENDORSED]
If two dipole moments point in exact opposite directions they will cancel each other out and cause the molecule to be non polar, but if the dipole moments do not exactly cancel each other out then there will be a resulting polarity of the molecule.
- Sun Jun 03, 2018 11:13 am
- Forum: Hybridization
- Topic: Question 4.45
- Replies: 3
- Views: 373
Re: Question 4.45
Pi bonds involve the overlapping of atomic orbitals in covalent bonds. Pi bonds are only used when there is more than one bond (double or triple bond)
- Sun Jun 03, 2018 11:11 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Final
- Replies: 5
- Views: 562
Re: Final
As I understand we only have to understand how coordination complexes work, not name them, correct?
- Sun May 20, 2018 4:50 pm
- Forum: Ionic & Covalent Bonds
- Topic: Octet rule
- Replies: 17
- Views: 2357
Re: Octet rule
I know elements can break the octet rule, but up to how many extra electrons can they have?
- Sun May 20, 2018 4:48 pm
- Forum: Ionic & Covalent Bonds
- Topic: double and triple bonds?
- Replies: 2
- Views: 286
Re: double and triple bonds?
The elements in the 7th column never form double bonds, as a general rule
- Sun May 20, 2018 4:38 pm
- Forum: Lewis Structures
- Topic: 3.55
- Replies: 6
- Views: 535
Re: 3.55
Anytime a compound or molecule has an odd number of electrons its going to be a radical
- Sun May 20, 2018 4:34 pm
- Forum: Lewis Structures
- Topic: 3.33 c). Ionization energy question.
- Replies: 4
- Views: 474
Re: 3.33 c). Ionization energy question.
I thought you put the molecule with the lowest electronegativity in the center, are ionization energy and electronegativity the same thing?
- Sun May 20, 2018 4:33 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic compound
- Replies: 2
- Views: 288
Re: Ionic compound
This is correct!
- Sun May 20, 2018 4:31 pm
- Forum: Ionic & Covalent Bonds
- Topic: Polar covalent bonds
- Replies: 2
- Views: 345
Re: Polar covalent bonds
A polar covalent bond is when electrons are shared between the atoms (as opposed to transferred which would be ionic) but the sharing is not completely equal. That means that the shared electrons will be pulled closer to one atom than the other, but they are still shared
- Sun May 20, 2018 10:10 am
- Forum: Lewis Structures
- Topic: Lewis Structure of XeO2F2
- Replies: 2
- Views: 498
Lewis Structure of XeO2F2
Can someone explain why Xe can have so many bonds/ lone pair electrons in this lewis structure?
- Wed May 09, 2018 12:42 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Significant Figures [ENDORSED]
- Replies: 4
- Views: 613
Midterm Significant Figures [ENDORSED]
Hello Does anyone know how heavily sig figs are weighted on the midterm? As in, if we dont properly use sig figs would an entire answer be wrong or would just a couple points be taken off for lack of sig figs? Also, if a problem uses an answer you had to obtain earlier in the problem do you use the ...
- Wed May 09, 2018 12:38 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: E=R(1/n-1/n)?
- Replies: 7
- Views: 1056
Re: E=R(1/n-1/n)?
When given two energy levels (n1,n2) or a beginning and ending energy state you can use the E=R(1/n-1/n). The other formula, E=-R(h/n^2) is used to find the energy of an electron in the nth state of a hydrogen atom specifically
- Wed May 09, 2018 12:34 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: equation
- Replies: 2
- Views: 385
Re: equation
Also, at one of the review sessions they said that most of the time you will just need to use (=) not (>=) for the equations we are currently doing
- Wed May 09, 2018 12:32 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Order of Orbitals
- Replies: 3
- Views: 458
Re: Order of Orbitals
Chromium also has the same except rule as copper!
- Wed May 09, 2018 12:31 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization exceptions [ENDORSED]
- Replies: 8
- Views: 1637
Re: Ionization exceptions [ENDORSED]
The ionization energies and electron affinities of carbon, nitrogen, oxygen, and fluorine do not match with the trends perfectly. Also, chromium and copper have unique electron configuration rules.
- Wed May 09, 2018 12:29 pm
- Forum: Ionic & Covalent Bonds
- Topic: Periodic Trends
- Replies: 3
- Views: 433
Re: Periodic Trends
I am pretty sure covalent radius is not a trend on the periodic table.
- Wed May 09, 2018 12:28 pm
- Forum: Properties of Light
- Topic: Energy vs Intensity
- Replies: 4
- Views: 589
Re: Energy vs Intensity
However, I think you have to be careful because "intensity" of light (or bright vs faint light) does not affect anything during electron emission, whereas wavelength and frequency will affect this.
- Wed May 09, 2018 12:26 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Test 2 Q.4
- Replies: 3
- Views: 586
Re: Test 2 Q.4
You can use two equations to reach a final answer. The first equation is deltaE=hv(frequency). You can then use the equation v(frequency)=c/wavelength as a substitute for v(frequency). This will give you the combined equation of deltaE=hc/wavelength. H and C are both constants and the wavelength is ...
- Tue May 01, 2018 4:49 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Review Sessions [ENDORSED]
- Replies: 3
- Views: 396
Review Sessions [ENDORSED]
Hello! I am planning on going to many of the review/workshop sessions coming up, but I was wondering if it would be possible to have the review sessions either BruinCast or have the review material posted on the website somewhere. I know I am probably not the only one who would like to attend all th...
- Wed Apr 18, 2018 4:28 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test Number 1
- Replies: 10
- Views: 1209
Re: Test Number 1
I dont know the average score, but a lot of kids in my discussion were not able to finish all the problems, if that makes you feel better.
- Wed Apr 18, 2018 4:25 pm
- Forum: Properties of Electrons
- Topic: Diffraction meaning
- Replies: 6
- Views: 611
Re: Diffraction meaning
Constructive diffraction is when the peaks and troughs of the waves line up, the other diffraction is when the peaks and troughs of the waves do not line up and then essentially cancel each other out (in really basic terms)
- Wed Apr 18, 2018 4:20 pm
- Forum: DeBroglie Equation
- Topic: Measurable Wavelike properties
- Replies: 3
- Views: 400
Re: Measurable Wavelike properties
He said the approximate cutoff is 10^-18 for whether or not you would be able to observe the wavelike properties.
- Mon Apr 09, 2018 2:02 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Homework for Week 2
- Replies: 2
- Views: 244
Re: Homework for Week 2
I believe the homework for week 2 is from outline 2, but after doing some research I am not positive because the schedule is not explicitly mentioned.
- Mon Apr 09, 2018 1:59 pm
- Forum: Significant Figures
- Topic: Sig fig simple question [ENDORSED]
- Replies: 5
- Views: 616
Re: Sig fig simple question [ENDORSED]
In this case, if the decimal was .985243649 but you only wanted one significant figure would you round up to 1? Or would you stay at .9
- Mon Apr 09, 2018 1:57 pm
- Forum: Properties of Light
- Topic: Speed of light wavelength equation [ENDORSED]
- Replies: 4
- Views: 724
Re: Speed of light wavelength equation [ENDORSED]
Most commonly I think we have been using the equation in the form wavelength= c (3.0 x 10^8)/ frequency to solve for the wavelength. I feel like that is the most common form of the equation that we have seen.
- Fri Apr 06, 2018 2:30 pm
- Forum: Balancing Chemical Reactions
- Topic: H.5: Balancing Equations
- Replies: 6
- Views: 969
Re: H.5: Balancing Equations
I always find it helpful to fully erase and rewrite the coefficients to keep the problem organized. Also remember that you can use fractions in certain spots to make the math a bit easier then you can multiply everything by the denominator of the fraction.
- Fri Apr 06, 2018 2:25 pm
- Forum: SI Units, Unit Conversions
- Topic: Calculator On Test [ENDORSED]
- Replies: 1
- Views: 130
Calculator On Test [ENDORSED]
Will we be able to use a calculator on Test 1 and all future tests?
- Fri Apr 06, 2018 2:21 pm
- Forum: Significant Figures
- Topic: Sig Figs [ENDORSED]
- Replies: 9
- Views: 930
Re: Sig Figs [ENDORSED]
Hey Brynne!
You will not need sig figs for test 1 but probably will need them in the future, Lavelle just said this in lecture today.
Madison
You will not need sig figs for test 1 but probably will need them in the future, Lavelle just said this in lecture today.
Madison