Search found 19 matches
- Tue Aug 01, 2017 8:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 11.45 Part C
- Replies: 3
- Views: 614
Re: 11.45 Part C
Thank you, but how based on the calculations of concentration are we able to tell? The solutions manual says because of the larger equilibrium concentration, but how does the equilibrium concentration relate back to thermodynamic stability?
- Tue Aug 01, 2017 9:21 am
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: Henderson-Hasselbalch Equation
- Replies: 3
- Views: 1467
Re: Henderson-Hasselbalch Equation
Along with this, is there any difference between Ka and pKa? Does the HH equation mean that we will be using pKa?
- Mon Jul 24, 2017 10:32 pm
- Forum: Hybridization
- Topic: Bond Order
- Replies: 4
- Views: 1616
Re: Bond Order
Does counting the bonds and classifying them based upon the total number of shared electrons stand across all cases? I have come across examples where a linear structure was given and the correct hybridization turned out to be sp^3. Can someone help clarify why that would be?
- Mon Jul 24, 2017 10:24 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Self-Test 2 Problem 4
- Replies: 2
- Views: 573
Re: Self-Test 2 Problem 4
To get the oxidation state of the central atom, you first would need to find the formal charge of all of the ligands attached to the complex. Oxidation state of CN^- is -1 and there is one (1 x -1 = -1), and oxidation state of NH3 is 0 and there are 3 (3 x 0 =0). Once you have those charges you can ...
- Mon Jul 24, 2017 10:12 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentates
- Replies: 3
- Views: 642
Re: Polydentates
When ligands are bonded to a metal or transition metal, they are bound by sharing electrons. Since it only takes 2 electrons to form a bond that can be shared between the complex and the ligand, double and triple bonds are not required as far as I know. Not completely sure though, hope this helped!
- Mon Jul 24, 2017 10:05 pm
- Forum: Naming
- Topic: Naming Ligands
- Replies: 4
- Views: 749
Re: Naming Ligands
Separating the ligands into groups also helps, I separated them by their charge. This way you can more easily digest all of the information while also memorizing the charge of each ligand while you are trying to remember the name!
- Thu Jul 20, 2017 2:11 pm
- Forum: Lewis Structures
- Topic: Writing formulas for compounds [ENDORSED]
- Replies: 2
- Views: 1203
Re: Writing formulas for compounds [ENDORSED]
I am working on the same problem and while the explanation helps I still am confused on whether or not we are expected to know the chemical formulas for these salts? I understand how we deduce the subscripts, but are we supposed to know that for example, ammonium ion is NHsub4? Or where do we get th...
- Sun Jul 16, 2017 9:03 pm
- Forum: Electronegativity
- Topic: Electron Affinity
- Replies: 12
- Views: 2045
Re: Electron Affinity
I don't believe so. Apparently, the test next Tuesday will cover all new material since Exam 1 but not including topics from Exam 1 like the periodic trends.
- Sun Jul 16, 2017 9:01 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3005362
Re: Post All Chemistry Jokes Here
Q: If H2O is the formula for water, what is the formula for ice?
A: H2O cubed.
A: H2O cubed.
- Sun Jul 16, 2017 8:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Difference between VSEPR and MOT
- Replies: 3
- Views: 8452
Re: Difference between VSEPR and MOT
A question on notation, is there any way to tell whether an electron has a lone pair from the molecular formula? (the E in the A,X,E)
- Sun Jul 16, 2017 7:37 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: How to display polar dipole moments in VSEPR model
- Replies: 2
- Views: 751
Re: How to display polar dipole moments in VSEPR model
What exactly do dipole moments measure? What about dipole moments allow them to cancel each other? Sorry, this topic is not the clearest to me if someone could please explain.
- Sun Jul 09, 2017 4:51 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Exercise 2.29
- Replies: 10
- Views: 3554
Re: Exercise 2.29
For Problem 2.49 "Predict the number of valence electrons present in each of the following atoms (include the outermost d-electrons: (a) N; (b) Ag; (c) Nb; (d) W." What trend are we expected to see in order to identify the number of valence electrons? The atomic number? Is there also somet...
- Sun Jul 09, 2017 4:30 pm
- Forum: Octet Exceptions
- Topic: Pre/Post Assessment & Video Module
- Replies: 2
- Views: 524
Pre/Post Assessment & Video Module
Will there be pre/post assessment modules uploaded to the website as well as video modules to use as resources for the material covered in Chapters 2 and 3?
- Sun Jul 09, 2017 3:50 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Formal Charge
- Replies: 3
- Views: 682
Formal Charge
When calculating formal charge, how do we tell apart which electrons are valence from those that are lone or shared? Aren't lone and shared electrons also valence electrons? If not, how can we distinguish them to utilize the formula FC=V-(L+S/2)? Thank you
- Thu Jul 06, 2017 5:20 am
- Forum: Photoelectric Effect
- Topic: How to calculate the kinetic energy, energy and frequency? [ENDORSED]
- Replies: 25
- Views: 7343
Re: How to calculate the kinetic energy, energy and frequency? [ENDORSED]
Won't the mass of the electron need to be given in order to solve A) of this problem?
- Sat Jul 01, 2017 9:35 pm
- Forum: Significant Figures
- Topic: sig figs in electronic transition problem
- Replies: 5
- Views: 870
Re: sig figs in electronic transition problem
Same question, I get confused on which to pay attention to when putting significant figures in the final answer. From my understanding though, the significant figures you begin with is what should be present in your final answer. Again, I could be misunderstood. Does someone mind clarifying this?
- Sat Jul 01, 2017 9:25 pm
- Forum: DeBroglie Equation
- Topic: De Broglie Wavelength
- Replies: 23
- Views: 3326
Re: De Broglie Wavelength
Will frequency always be given in problems that ask to calculate wavelength?
- Sat Jul 01, 2017 9:10 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect
- Replies: 5
- Views: 1055
Re: Photoelectric Effect
Under which circumstances do we utilize the formula E=hc/lambda that incorporates the lambda?
- Fri Jun 30, 2017 9:16 pm
- Forum: Significant Figures
- Topic: Sig Figs in a problem with addition & multiplication [ENDORSED]
- Replies: 5
- Views: 3105
Re: Sig Figs in a problem with addition & multiplication [ENDORSED]
For intermediate calculations what are the general rules for sig figs in a problem with add/sub and mult/divis?
Is it best to not worry about sig figs intermediately in a mixed type of problem or should we adjust for sig figs throughout?
Is it best to not worry about sig figs intermediately in a mixed type of problem or should we adjust for sig figs throughout?