## Search found 15 matches

Sun May 20, 2018 9:52 pm
Forum: Lewis Structures
Topic: Formal Charge
Replies: 4
Views: 339

### Formal Charge

What is the best way to remember how to calculate formal charge since the equation will not be given to us?
Sun May 20, 2018 9:38 pm
Forum: Dipole Moments
Topic: Dipole causes
Replies: 2
Views: 167

### Re: Dipole causes

Unequal attraction between two atoms from the bonds they have formed.
Sun May 20, 2018 9:32 pm
Forum: Electronegativity
Topic: Isoelectronic atoms and their relative electronegativities
Replies: 2
Views: 389

### Re: Isoelectronic atoms and their relative electronegativities

Since elements that are more electronegative are more likely to gain electrons and atoms that are isoelectronic have the same number of electrons, the electronegativity of the atoms should be equivalent. For example an atom with 10 electrons shouldn't have more electronegativity than another atom wi...
Sun May 06, 2018 11:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Friday's Review Session
Replies: 1
Views: 236

### Re: Friday's Review Session

We went over limiting reactants (question M12 from textbook), energy levels (1.12 from textbook), molarity and dilution (question 1 from fridays test 1), and empirical formula (question 7 from Friday's test 1).
Sun May 06, 2018 11:05 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: How many significant figures? [ENDORSED]
Replies: 5
Views: 273

### Re: How many significant figures?[ENDORSED]

Since these numbers reference atomic energy level and cant be any non-integer I don't think they effect sig figs. That being said I would give the exact value.
Sun May 06, 2018 11:01 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: midterm Q.7b [ENDORSED]
Replies: 3
Views: 277

### Re: midterm Q.7b[ENDORSED]

I think the negative sign is to reference the energy lost when changing atomic level.
Sun Apr 22, 2018 10:32 pm
Forum: DeBroglie Equation
Topic: How do you calculate speed using the De Broglie equation? [ENDORSED]
Replies: 6
Views: 966

### Re: How do you calculate speed using the De Broglie equation?[ENDORSED]

Speed would be the same as velocity. Since the De Broglie equation is wavelength=Planck's constant/momentum and we know momentum is mass times velocity you can rearrange the equation to find velocity.
Sun Apr 22, 2018 10:13 pm
Forum: Photoelectric Effect
Topic: Energy levels
Replies: 7
Views: 1622

### Re: Energy levels

Try to think about it like a ladder where the size between steps gets closer the higher you go. If N1 is the ground and N2 is the first ladder step, N1 to N2 is the biggest individual step size. However, jumping off of the figurative ladder from say N4 to N1 would be higher (more energy) than simply...
Sun Apr 22, 2018 10:05 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Atom's diameter
Replies: 2
Views: 282

### Re: Atom's diameter

Correct me if I'm wrong, but because of the incorrect model of the atom the electrons were believed to be inside the nucleus. Therefore, the uncertainty of the electrons velocity would be limited to the diameter of the atom because the electrons could move about.
Sun Apr 15, 2018 11:11 pm
Forum: Properties of Light
Topic: Frequency 1/s or s^-1 [ENDORSED]
Replies: 3
Views: 205

### Re: Frequency 1/s or s^-1[ENDORSED]

I believe it is just preference since they mean the same thing, however if the question has certain units it is safer to just use those.
Sun Apr 15, 2018 11:07 pm
Forum: Properties of Light
Topic: Properties of Light
Replies: 4
Views: 229

### Re: Properties of Light

If by human eye you mean the wavelengths of light visible to the human eye (500 nm) then I would say no, it seems like a factoid they would give you when asking the problem.
Sun Apr 15, 2018 11:03 pm
Forum: Photoelectric Effect
Topic: Quanta vs. Photon [ENDORSED]
Replies: 3
Views: 344

### Quanta vs. Photon[ENDORSED]

So are Quanta measured by amount of photons, or are these completely unrelated and I'm confusing something?
Sun Apr 15, 2018 10:54 pm
Forum: Balancing Chemical Reactions
Topic: Suggestions for Balancing Reactions
Replies: 8
Views: 539

### Re: Suggestions for Balancing Reactions

I like to write out the amount of each element on each side of the equation to avoid simple memory mistakes. This is also helpful when balancing the equation itself because you can constantly refer back to it and make sure you are making correct calculations.
Sun Apr 15, 2018 10:48 pm
Forum: Limiting Reactant Calculations
Topic: Percentage of Yield
Replies: 2
Views: 214

### Percentage of Yield

Will we ever be required to calculate how much of the theoretical yield was lost in the beakers, amount of reactants unreacted, etc.? (i.e. 4.5% yield lost in beakers and 3% of reactant remaining the same.)
Sun Apr 15, 2018 10:39 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molar Mass
Replies: 9
Views: 675

### Re: Molar Mass

It's also important to understand that Atomic mass is "unitless", while molar mass is grams/mol.