## Search found 20 matches

Sun Jul 30, 2017 11:41 pm
Forum: *Biological Importance of Buffer Solutions
Topic: Limitations to the Henderson-Hasselbach Eq
Replies: 1
Views: 2224

### Limitations to the Henderson-Hasselbach Eq

What were the limitations for the Henderson-Hasselbach equation? In other words, when can it NOT be calculated? (i.e. when acids/bases are strong/weak) Also, to get rid of the logs, you can simply raise everything to the power of 10 correct? I've used it for other equations but I'm not sure if you c...
Sun Jul 30, 2017 11:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Replies: 3
Views: 455

In some of the equilibrium HW problems, they have you "refer to Table 11.2." Does anyone know if we need to memorize those values/we will get them on the Exam?
Sun Jul 30, 2017 11:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Decomposition
Replies: 2
Views: 310

### Re: Decomposition

Thanks! Do you know the formula off hand by chance? I'm currently searching for it haha
Sun Jul 30, 2017 11:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Decomposition
Replies: 2
Views: 310

### Decomposition

What is the significance of the % decomposition?
Sun Jul 30, 2017 9:40 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Temperature
Replies: 4
Views: 560

### Re: Temperature

thanks so much!
Sun Jul 30, 2017 7:47 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Temperature
Replies: 4
Views: 560

### Temperature

I'm having a difficult time understanding how equilibrium shift from temperature. Are there any easy concept to remember for solving these problems? Let me know if I need to clarify
Sun Jul 30, 2017 2:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Replies: 2
Views: 316

I understand that when you apply the quadratic formula, you get two values (one of which is typically negative). What is the concept behind the reason why you would NOT use the negative number to plug back into the equilibrium equation?
Fri Jul 21, 2017 6:41 am
Forum: Lewis Structures
Topic: double bonds
Replies: 2
Views: 323

### double bonds

So after practicing Lewis Structure, I've realized some atoms such as S, C and O create double bonds more often than others. What is the reasoning behind that?
Tue Jul 18, 2017 11:40 pm
Forum: Octet Exceptions
Topic: Octets
Replies: 8
Views: 675

### Re: Octets

Does that apply for all row 3 atoms? That they can all accept more than 8 electrons? If so, can they all accept a total of 10, just like Sulfur?

Thanks
Tue Jul 18, 2017 11:19 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Mixing Orbitals
Replies: 1
Views: 233

### Mixing Orbitals

When mixing orbitals with one another, do you always need similar energies as well as similar symmetry between bonds? If not, what would happen? would they simply not bond?

Thanks!
Tue Jul 18, 2017 11:16 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Second row Molecules
Replies: 1
Views: 250

### Second row Molecules

Why does the order of Molecular Orbital energies change as they cross the second row diatomic?
Sat Jul 15, 2017 12:44 am
Forum: Hybridization
Topic: Bond Order
Replies: 4
Views: 963

### Bond Order

NEED CLARIFICATION: How do you calculate bond order? And what does it mean in terms of chemistry? Can bond order be calculated for just one atom, or does it have to be two atoms joined together?

Thank you!
Fri Jul 14, 2017 5:43 pm
Forum: Trends in The Periodic Table
Topic: 1st and 2nd ionization energy? [ENDORSED]
Replies: 7
Views: 2239

### Re: 1st and 2nd ionization energy?[ENDORSED]

In terms of equations, the equation for the first ionization of energy is: Na --> Na+ + e-. Whereas the equation for the second ionization of energy is: Na+ --> Na2+ + e-. Also, it takes MORE energy for the second ionization of energy!

Hope this helps!
Fri Jul 14, 2017 5:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Fajan's Rule
Replies: 1
Views: 374

### Fajan's Rule

Can somebody please explain Fajan's Rules of Polarization? What are the trends in charges, anions and cations?

Thank you!
Fri Jul 14, 2017 5:26 pm
Forum: Lewis Structures
Topic: Exceeded Octet
Replies: 2
Views: 307

### Exceeded Octet

How do you determine whether the octect rule is exceeded? And where do you assign those extra pairs?
Sun Jul 09, 2017 7:34 pm
Forum: DeBroglie Equation
Topic: Neutrons
Replies: 4
Views: 721

### Re: Neutrons

Because Neutrons behave like a wave can we use the equation E = mc^2 to find the energy of the neutron if we know the mass of the neutron?
Sun Jul 09, 2017 7:26 pm
Forum: Properties of Light
Topic: Amplitude of the wave [ENDORSED]
Replies: 7
Views: 661

### Re: Amplitude of the wave[ENDORSED]

The amplitude of a wave is directly related to how high energy the wave is.

Think as if you were creating waves on a string fixed at the other end. The harder you jerk it(the more energy you put in) the higher the amplitude of the wave you created will be.
Sun Jul 09, 2017 7:18 pm
Forum: Einstein Equation
Topic: What is the eV unit? [ENDORSED]
Replies: 6
Views: 3209

### Re: What is the eV unit?[ENDORSED]

Also the term electron volt is self defining in that 1 eV is literally the charge of one electron times 1 Volt.
(1.6 x 10 ^-19 C) * (1 kg m^2 s^-2 C^-1) = 1.6 * 10^-19 J

In reality it is just about having ease of units more than anything else

Hope this helps!
Sun Jul 09, 2017 7:09 pm
Forum: Properties of Light
Topic: Quantum Spin Number
Replies: 1
Views: 221

### Quantum Spin Number

So I know that the sign of the Quantum Spin Number defines the direction of the spin, but why is the Quantum Spin Number only equal to +/- 1/2 instead of being +/- 1?
Fri Jun 30, 2017 9:51 pm
Forum: Properties of Electrons
Topic: electrons
Replies: 2
Views: 379

### electrons

Curious. If a photon does not have enough energy to emit an electron from a metal surface, where does that energy go? Does it get stored as potential energy? Or does it simply just escape and become irrelevant?