Search found 29 matches
- Thu Jun 14, 2018 1:49 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Charge on ligands? [ENDORSED]
- Replies: 2
- Views: 1028
Re: Charge on ligands? [ENDORSED]
Don't you find the oxidation of the metal then match it equally and with an opposite charge for the ligand?
- Thu Jun 14, 2018 1:48 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: what is lechatliers principle [ENDORSED]
- Replies: 4
- Views: 853
Re: what is lechatliers principle [ENDORSED]
Doesn't it have to do with equilibrium?
- Wed Jun 13, 2018 7:31 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam [ENDORSED]
- Replies: 5
- Views: 704
Re: Final Exam [ENDORSED]
The general review sessions have had a bit of everything... But incorporate multiple chapters in one question
- Sat Jun 02, 2018 6:30 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: formal charge and VSEPR
- Replies: 8
- Views: 1021
Re: formal charge and VSEPR
It's better to do it this way... but does anybody know if it's a necessity to be correct?
- Sat Jun 02, 2018 6:24 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Define Ligands?
- Replies: 10
- Views: 1120
Re: Define Ligands?
What kind of thing do you think we could be asked regarding ligands
- Mon May 28, 2018 1:53 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge Meaning
- Replies: 5
- Views: 968
Re: Formal Charge Meaning
Does that mean that formal charge and the dipole movement are related/similar concepts?
- Thu May 24, 2018 8:18 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis acid vs. base
- Replies: 5
- Views: 1058
Re: Lewis acid vs. base
Also if you do a Lewis structure, and there are unbonded valence electrons on the central atom, it's a Lewis base
- Thu May 24, 2018 5:38 pm
- Forum: Ionic & Covalent Bonds
- Topic: Formal charge?
- Replies: 12
- Views: 1381
Re: Formal charge?
Would the equation:
valence electrons - non-bonding valence electrons - (bonding electrons/2)
also work?
valence electrons - non-bonding valence electrons - (bonding electrons/2)
also work?
- Sat May 12, 2018 5:59 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Oxidation Number & Bonds
- Replies: 6
- Views: 2564
Re: Oxidation Number & Bonds
I would believe so? Sort of like whichever value is easiest to achieve with the elements at hand to achieve the desired results
- Thu May 10, 2018 9:06 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)?
E=R(1/n2^2-1/n1^2) is the equation to specifically find the change in energy. The E= -hR/n^2 is for one specific energy level
- Thu May 10, 2018 8:58 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: De Broglie Equation in Heisenberg Uncertainty Equation
- Replies: 2
- Views: 490
Re: De Broglie Equation in Heisenberg Uncertainty Equation
I would assume it's possible because both involve the wave-like nature of light. I would think you could possibly include Schrodinger's in there as well with them.
- Sun May 06, 2018 9:58 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Q. G5
- Replies: 1
- Views: 307
Re: Q. G5
a) First, you convert the mmol to mol - keeping in mind since there's 2 Na in Na2CO3 the molarity will be doubled. Then you can divide the values in the formula: 0.002015/0.16 --> 0.013 L
- Sun May 06, 2018 9:52 pm
- Forum: Trends in The Periodic Table
- Topic: Trends to Know
- Replies: 12
- Views: 1286
Re: Trends to Know
All the ones listed so far are the only ones we went over in Step Up
- Sun May 06, 2018 9:45 pm
- Forum: Student Social/Study Group
- Topic: Midterm Study Group
- Replies: 1
- Views: 363
Midterm Study Group
Hi everybody!
There's a come-and-go study group this Tuesday from 3p until 7p in Sproul Hall's 6th Floor lounge. Anybody's welcome to come and leave whenever they would like to leave.
There's a come-and-go study group this Tuesday from 3p until 7p in Sproul Hall's 6th Floor lounge. Anybody's welcome to come and leave whenever they would like to leave.
- Sun Apr 29, 2018 8:57 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 2.25
- Replies: 3
- Views: 384
Re: 2.25
I just did it using the little equations!
Spherical nodes : n - l - 1
Number of angular nodes: l
Total nodes: n-1
Spherical nodes : n - l - 1
Number of angular nodes: l
Total nodes: n-1
- Sat Apr 28, 2018 8:58 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: What do l and m represent? [ENDORSED]
- Replies: 6
- Views: 1033
Re: What do l and m represent? [ENDORSED]
https://youtu.be/Aoi4j8es4gQ I found this video pretty helpful clarifying it all
- Sat Apr 28, 2018 8:55 pm
- Forum: *Shrodinger Equation
- Topic: Shrodinger Equation
- Replies: 7
- Views: 851
Re: Shrodinger Equation
According to the text book, it’s used to calculate the wave function for any particle and the corresponding energy E
- Sun Apr 22, 2018 9:30 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Balmer Series vs Lyman Series
- Replies: 4
- Views: 1112
Re: Balmer Series vs Lyman Series
The Paschem series and Brackett series were also mentioned in a hw question. Can anybody explain these better?
- Sun Apr 22, 2018 9:25 pm
- Forum: Student Social/Study Group
- Topic: Study Group
- Replies: 10
- Views: 1591
Re: Study Group
Follow the GroupMe link!
- Sun Apr 22, 2018 9:24 pm
- Forum: Photoelectric Effect
- Topic: Wave vs. Particle
- Replies: 8
- Views: 663
Re: Wave vs. Particle
Particles have mass while photons do not... both still have momentum though!
- Sun Apr 22, 2018 4:54 pm
- Forum: Properties of Light
- Topic: Question About Photons [ENDORSED]
- Replies: 3
- Views: 459
Re: Question About Photons [ENDORSED]
When this occurs would momentum still have the same function and measure as when mass exists?
- Sat Apr 14, 2018 10:04 pm
- Forum: Student Social/Study Group
- Topic: Study Group
- Replies: 10
- Views: 1591
Re: Study Group
You're invited to my new group '14A - Lavelle' on GroupMe. Click here to join: https://groupme.com/join_group/39693612/gWBYOk
For scheduling only- leave content questions on chem community please
For scheduling only- leave content questions on chem community please
- Wed Apr 11, 2018 9:11 pm
- Forum: Empirical & Molecular Formulas
- Topic: Empirical Formula
- Replies: 3
- Views: 611
Re: Empirical Formula
More specifically, how would I find the mass percentages given a full balanced equation
- Wed Apr 11, 2018 5:31 pm
- Forum: Empirical & Molecular Formulas
- Topic: Empirical Formula
- Replies: 3
- Views: 611
Empirical Formula
Polyethylene is a hydrocarbon polymer used to produce food-storage bags and many other flexible plastic items. A combustion analysis of a 0.00126-g sample of polyethylene yields 0.00394-g of CO2 and 0.00161-g of H20. What is the empirical formula of polyethylene? I've balanced the equation but now I...
- Mon Apr 09, 2018 4:52 pm
- Forum: Student Social/Study Group
- Topic: Study Group
- Replies: 10
- Views: 1591
Re: Study Group
Nancy, I emailed you!
- Thu Apr 05, 2018 3:13 pm
- Forum: Balancing Chemical Reactions
- Topic: H.5: Balancing Equations
- Replies: 6
- Views: 970
Re: H.5: Balancing Equations
So the best thing that I found, was to make a chart of the elements as I go Fe2P(s)+S(s)-->P4S10(s)+FeS(s) 2 - Fe - 1 1 - P - 4 1 - S - 11 The left has the number of elements in the reactant side and the right is the product side. As I balance one, I change it all the ones affected. For example, sta...
- Thu Apr 05, 2018 10:32 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: E.27
- Replies: 2
- Views: 209
Re: E.27
1: convert 1kg to 1000 g 2: you'll need to convert first to moles (value given of H20 in grams * 1 Mol H20) / (atomic mass of H20g) atomic mass found by using periodic table 3: Now we have the number of H20 moles so we can use Avogadro's Number (molecules/moles) to convert moles to molecules by mult...
- Thu Apr 05, 2018 10:21 am
- Forum: Limiting Reactant Calculations
- Topic: Module 3: Limiting Reactant Calculations, Question 19
- Replies: 4
- Views: 877
Re: Module 3: Limiting Reactant Calculations, Question 19
Jocelyn is right, you can't do anything with this problem without balancing the equation first to make sure to account for the Law of Conservation of Mass. The next step would be calculating the number of moles that are actually given from the mass in grams. Use this information to determine which i...
- Tue Apr 03, 2018 1:06 pm
- Forum: Student Social/Study Group
- Topic: Study Group
- Replies: 10
- Views: 1591
Study Group
Hi everybody! My name is Hannah. A few of us are starting a weekly chemistry study group Thursdays at 4:30-6:30 at Sproul Hall. Depending on availability, we'll meet in a lounge or one of the study rooms - either way, we'll meet in the lobby. I'll post again if there are any changes to the informati...