## Search found 10 matches

Sun Dec 06, 2015 1:35 am
Forum: Empirical & Molecular Formulas
Topic: Fall 2014 Final Exam Q1A
Replies: 1
Views: 396

### Fall 2014 Final Exam Q1A

Usually when we are finding empirical and molecular formulas and we are given the mass of the sample and compositions, don't we have to find the mass % of each element then assume a sample mass of 100 g? Why didn't the worked our example do this part?
Sun Nov 29, 2015 5:29 pm
Forum: Ideal Gases
Topic: Equilibruim
Replies: 1
Views: 512

### Re: Equilibruim

For this problem, since K is less than 1, there are more reactants at equilibrium so the reaction is shifted towards the products. Therefore, we can re-write the new initial amounts as 4 (HCl), 0 (H2), 2 (Cl). 2HCl--> H2 + Cl2 I 2 1 3 I (New) 4 0 2 C -2x +x +x E 4-2x x 2+x
Sat Nov 21, 2015 3:39 pm
Forum: Bronsted Acids & Bases
Topic: pH of Water at Body Temperature
Replies: 1
Views: 1366

### Re: pH of Water at Body Temperature

Hi Christine! When I did the calculation, I took the square root of 2.1 x 10^-14 to find the molarity of H30+ and I got 1.45 x 10^-7. When I took the negative log of that I got 6.838 so I'm guessing the solution manual has the answer rounded to the nearest tenth which would be 6.8. However, I know t...
Sun Nov 15, 2015 1:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K Calculation Clarification
Replies: 1
Views: 301

### Re: K Calculation Clarification

Yes, this is correct. If there are solids and liquids present in the reaction, then it is a heterogenous reaction and the concentrations of solids and liquids are not considered when finding the equilibrium constant, K. Therefore, activities of solids and liquids will be equal to 1 in the equation
Sat Nov 07, 2015 8:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homo/Heterogenous Equilibria
Replies: 2
Views: 704

### Homo/Heterogenous Equilibria

How do we differentiate between Homogenous Equilibrium and Heterogenous Equilibrium and how are they related to finding the Equilibrium Constant?
Sun Nov 01, 2015 2:30 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Molecular Orbitals w/Nuclear charges <8
Replies: 1
Views: 205

### Molecular Orbitals w/Nuclear charges <8

Say for a molecule such as CO, which orbital order would we use? Would the σpz orbital be above the πpx and πpy orbitals since C is less than 8 OR because O has a nuclear charge greater than 8 the σpz would be below the two π orbitals?
Thu Oct 22, 2015 7:45 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Choosing the Best Lewis Structure
Replies: 2
Views: 11238

### Choosing the Best Lewis Structure

How do you know the best Lewis Structure to use? Will it always be the Lewis structure with charges closest to 0 and would SO2 be the exception to this rule?
Sun Oct 11, 2015 9:32 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Problem 1.34
Replies: 1
Views: 386

### Problem 1.34

What is the highest energy photon that can be absorbed by a ground-state hydrogen atom without causing ionization?
Help would be greatly appreciated!
Thu Oct 08, 2015 8:34 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Online Module Question
Replies: 1
Views: 344

### Re: Atomic Spectra Online Module Question

According to the problem, 1m= 1,650,763.73 wavelengths so
1 wavelength = 1/1,650,763.73m = 6.058 x 10^-7m = 605.8 nm
Thu Oct 01, 2015 8:19 pm
Forum: Einstein Equation
Topic: The value of Planck's Constant
Replies: 3
Views: 1338

### Re: The value of Planck's Constant

Planck hypothesized that just like how water's smallest unit is a water molecule, energy also works the same way and can be expressed in discrete or "quantized" units. Therefore Planck's constant is used as a proportionality constant that links the particle's frequency of its electromagnet...