Search found 19 matches

by derek1d
Tue Aug 01, 2017 8:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.45 Part C
Replies: 3
Views: 284

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?
by derek1d
Tue Aug 01, 2017 9:21 am
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Henderson-Hasselbalch Equation
Replies: 3
Views: 697

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?
by derek1d
Mon Jul 24, 2017 10:32 pm
Forum: Hybridization
Topic: Bond Order
Replies: 4
Views: 718

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?
by derek1d
Mon Jul 24, 2017 10:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Self-Test 2 Problem 4
Replies: 2
Views: 335

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 ...
by derek1d
Mon Jul 24, 2017 10:12 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentates
Replies: 3
Views: 308

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!
by derek1d
Mon Jul 24, 2017 10:05 pm
Forum: Naming
Topic: Naming Ligands
Replies: 4
Views: 343

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!
by derek1d
Thu Jul 20, 2017 2:11 pm
Forum: Lewis Structures
Topic: Writing formulas for compounds [ENDORSED]
Replies: 2
Views: 482

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...
by derek1d
Sun Jul 16, 2017 9:03 pm
Forum: Electronegativity
Topic: Electron Affinity
Replies: 12
Views: 1155

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.
by derek1d
Sun Jul 16, 2017 9:01 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7567
Views: 1011291

Re: Post All Chemistry Jokes Here

Q: If H2O is the formula for water, what is the formula for ice?
A: H2O cubed.
by derek1d
Sun Jul 16, 2017 8:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Difference between VSEPR and MOT
Replies: 3
Views: 2577

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)
by derek1d
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: 362

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.
by derek1d
Sun Jul 09, 2017 4:51 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Exercise 2.29
Replies: 10
Views: 1172

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...
by derek1d
Sun Jul 09, 2017 4:30 pm
Forum: Octet Exceptions
Topic: Pre/Post Assessment & Video Module
Replies: 2
Views: 286

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?
by derek1d
Sun Jul 09, 2017 3:50 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Formal Charge
Replies: 3
Views: 374

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
by derek1d
Thu Jul 06, 2017 5:20 am
Forum: Photoelectric Effect
Topic: How to calculate the kinetic energy, energy and frequency? [ENDORSED]
Replies: 14
Views: 3081

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?
by derek1d
Sat Jul 01, 2017 9:35 pm
Forum: Significant Figures
Topic: sig figs in electronic transition problem
Replies: 5
Views: 450

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?
by derek1d
Sat Jul 01, 2017 9:25 pm
Forum: DeBroglie Equation
Topic: De Broglie Wavelength
Replies: 17
Views: 1022

Re: De Broglie Wavelength

Will frequency always be given in problems that ask to calculate wavelength?
by derek1d
Sat Jul 01, 2017 9:10 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 5
Views: 633

Re: Photoelectric Effect

Under which circumstances do we utilize the formula E=hc/lambda that incorporates the lambda?
by derek1d
Fri Jun 30, 2017 9:16 pm
Forum: Significant Figures
Topic: Sig Figs in a problem with addition & multiplication [ENDORSED]
Replies: 5
Views: 808

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?

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