## Search found 20 matches

Wed Jul 27, 2016 8:53 am
Forum: Hybridization
Topic: Organic [ENDORSED]
Replies: 1
Views: 256

### Organic[ENDORSED]

How do we determine the hybridization of organic molecules? By the shape? In the fall 2011 Final, Question 6C, the Nitrigen atom seems to be triton all planar but the hybridization is sp3 not sp2
Tue Jul 26, 2016 11:47 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: He2
Replies: 2
Views: 1461

### He2

There is a note in the course reader that says He2 is unstable, why is this?
When I completed the molecular orbital diagram all the orbitals are filled and it is diamagnetic.
Tue Jul 26, 2016 10:16 pm
Forum: Significant Figures
Topic: Temperature [ENDORSED]
Replies: 1
Views: 337

### Temperature[ENDORSED]

If we are given that the temperature is 100 degrees celsius should our answer only have 1 significant figure or do the significant figures of temperature not matter when trying to figure out how many significant figures our answer should have?
Fri Jul 08, 2016 10:12 pm
Forum: Dipole Moments
Topic: Dipole and Polarity [ENDORSED]
Replies: 3
Views: 630

### Dipole and Polarity[ENDORSED]

If a molecular structure has dipole charges that do not cancel each other out does that mean that it is polar?
Sun Jun 26, 2016 9:29 pm
Forum: Significant Figures
Topic: Significant figures [ENDORSED]
Replies: 9
Views: 1535

### Re: Significant figures[ENDORSED]

Significant figures are the number of digits in an answer relative to the numbers in the problem. 11.2 has 3 significant figures 11.20 has 4 significant figures 0.011 has 2 significant figures with decimals, the significant figures are counted after the first integer so for 0.011, 1 and anything aft...
Fri Dec 04, 2015 1:05 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Finding Chemical Equilibrium Concentrations
Replies: 4
Views: 6642

### Re: Finding Chemical Equilibrium Concentrations

Since molarity is the moles of solute per liter of solution it does not matter if she used moles in the ICE chart as long as long as the unit of moles is consistently used and at the end the number of moles is divided by the volume to get the molarity/concentration of the solutions at equilibrium
Fri Dec 04, 2015 12:56 am
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: Electron Configuration
Replies: 1
Views: 703

### Electron Configuration

Can somebody explain how to get the electron configuration of molecular orbitals and how this relates to typical electron configuration?
Fri Dec 04, 2015 12:33 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Moles or molarity in an ICE chart
Replies: 1
Views: 5235

### Moles or molarity in an ICE chart

When filling out an ICE chart can moles be used instead of molarity for the concentration, if we calculate the molarity at the end? I saw a video in which moles was used instead of molarity and am not sure if this was actually just an error.
Fri Dec 04, 2015 12:29 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: HOW TO: ICE CHARTS
Replies: 1
Views: 1217

### HOW TO: ICE CHARTS

This is an overview on filling out and ICE chart. I - Initial Concentration C - Change in Concentration E - Equilibrium Concentration For I - All the known concentrations should be filled in, for the products it will typically be 0 because no products have been formed. Many equilibrium problems give...
Fri Dec 04, 2015 12:14 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE charts
Replies: 4
Views: 1598

### Re: ICE charts

So this is kind of an overview when filling out an ICE chart with X ... Note that the equation will shift in only one direction. Then indicate an amount, x, that it shifts and write the stoichiometric coefficient in front of x and put a minus sign in front of any species for which the concentration ...
Fri Dec 04, 2015 12:08 am
Forum: DeBroglie Equation
Topic: Video: DeBroglie Equation
Replies: 3
Views: 556

### Re: Video: DeBroglie Equation

This was very helpful, thank you for breaking down the different parts of the equation and the steps in the problem.
Thu Dec 03, 2015 11:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: steric number
Replies: 2
Views: 1940

### Re: steric number

To determine the steric number of an atom, first count the number of bonds to that element; secondly count the number of lone pairs of electrons. Add the two numbers, and the result is the steric number. For ex: the O in water H2O has a steric number of 4: 2-H atoms and 2-lone pairs.NH3 also has a s...
Thu Dec 03, 2015 10:49 pm
Forum: Properties of Light
Topic: Kinetic Energy 1.23 c
Replies: 5
Views: 777

### Re: Kinetic Energy 1.23 c

Just to clarify photons are wave particles and according to special relativity, light is constantly traveling with speed c. Therefore photons are never at rest and do not have a rest mass but because they have energy they do have a mass. Particles such as electrons and protons do have a rest mass .
Thu Dec 03, 2015 10:39 pm
Forum: Hybridization
Topic: Clarification of lone pairs
Replies: 3
Views: 738

### Re: Clarification of lone pairs

Yes you're right! Lone pairs e- are very repulsive (even more than bonded e-) they also have a very large effect on the actual shape of the molecule. For ex. If there are lone pairs of e- around the central atom, the bonds around the central atom will be repulsed and will move away...so the bond ang...
Thu Dec 03, 2015 10:33 pm
Forum: Naming
Topic: latin names
Replies: 2
Views: 690

### Re: latin names

I think this is most of them, hope this helps. Also do not forget -ous is -ic when there are more protons.
Cuprous ion Cu+

Ferrous ion Fe2+

Mercuric ion Hg2+

Plumbous ion Pb2+

Stannous ion Sn2+

Chromous ion Cr2+

Manganous ion Mn2+

Cobaltous ion Co2+
Thu Dec 03, 2015 10:26 pm
Forum: SI Units, Unit Conversions
Topic: Percentages Sig Figs? [ENDORSED]
Replies: 5
Views: 19032

### Re: Percentages Sig Figs?[ENDORSED]

Do as you typically would so, for example, if you are given the following numbers 544.60 6.005 0.00343 Multiplying or dividing using these numbers results in three sig. figs because 544.60 --> 5 sig.figs 6.005 --> 4 sig.figs 0.00343 --> 3 sig.figs Your answer would have to be XX.X % with only 3 sig....
Thu Dec 03, 2015 10:21 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactants Explained
Replies: 1
Views: 636

### Limiting Reactants Explained

Personally limiting reagents is a concept I have struggle to understand but I think I have finally understood it and I hope this helps anybody still struggling with this. The limiting reagent is a reactant that determines the amount of product produced, it is also necessary in determining the final ...
Thu Dec 03, 2015 9:47 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pKa v. pKa1 and pKa2
Replies: 4
Views: 37263

### Re: pKa v. pKa1 and pKa2

Just like the pH, the pKa tells you of the acid or basic properties of a substance. pKa <2 means strong acid pKa >2 but <7 means weak acid pKa >7 but <10 means weak base pKa >10 means strong base pKa1 is when an acid can undergo more than 1 ionization the pka1 is the disassociation constant for the ...
Thu Dec 03, 2015 9:37 pm
Forum: Significant Figures
Topic: Sig Figs in Quantum Questions
Replies: 2
Views: 582

### Re: Sig Figs in Quantum Questions

I would use either the number of sig. figs. in the constant used or round to the thousandth decimal because it is better to be precise.
Thu Dec 03, 2015 9:33 pm
Forum: *Titrations & Titration Calculations
Topic: Titrations
Replies: 2
Views: 477

### Re: Titrations

A question can also be asked regarding how to reach the end point of titration and you could answer this by reasoning that the final point is greater than the volume of the titrant at stoich. and that the point would have to be at the flat are of the curve to because stoich. has been reached. You mi...