Search found 14 matches

by Jamie Reniva 1J
Wed Apr 25, 2018 11:13 pm
Forum: Einstein Equation
Topic: Difference Between Equations [ENDORSED]
Replies: 4
Views: 224

Difference Between Equations [ENDORSED]

What is the difference between E=hv and E=hc/lambda? Do you only use E=hv when frequency is given and E=hc/lambda when the wavelength is given?
by Jamie Reniva 1J
Mon Apr 23, 2018 10:27 am
Forum: Photoelectric Effect
Topic: Incident Light
Replies: 3
Views: 176

Incident Light

Is incident light the same as threshold energy?
by Jamie Reniva 1J
Mon Apr 23, 2018 9:18 am
Forum: Photoelectric Effect
Topic: What is work function? [ENDORSED]
Replies: 15
Views: 1058

What is work function? [ENDORSED]

What is the work function? Most of the time it's given in a problem, but I don't understand what is the meaning behind it.
by Jamie Reniva 1J
Mon Apr 23, 2018 9:13 am
Forum: Einstein Equation
Topic: Difference Between Equations
Replies: 4
Views: 198

Difference Between Equations

What is the difference betwee E=hv and E=1/2mv^2? Do these equations give out different types of energy? I don't understand why there's two types of equations and they both equal to "E"
by Jamie Reniva 1J
Mon Apr 23, 2018 9:10 am
Forum: DeBroglie Equation
Topic: DeBroglie
Replies: 7
Views: 242

DeBroglie

How do we know when to use the DeBroglie equation? I'm still a little bit confused where to get "p" in the equation.
by Jamie Reniva 1J
Mon Apr 23, 2018 9:03 am
Forum: *Black Body Radiation
Topic: Black Body? [ENDORSED]
Replies: 13
Views: 1082

Re: Black Body? [ENDORSED]

Why is it called black body?
by Jamie Reniva 1J
Mon Apr 23, 2018 8:59 am
Forum: Quantum Numbers and The H-Atom
Topic: quantum numbers [ENDORSED]
Replies: 3
Views: 160

Re: quantum numbers [ENDORSED]

I found this link online that talks about quantum number in depth:
https://chem.libretexts.org/Core/Physic ... um_Numbers
by Jamie Reniva 1J
Mon Apr 23, 2018 8:57 am
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 2
Views: 105

Photoelectric Effect

What is the difference between binding energy and threshold energy?
by Jamie Reniva 1J
Wed Apr 11, 2018 4:27 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula
Replies: 2
Views: 140

Re: Empirical Formula

Since the empirical formula is given, you can find the molar mass of the empirical formula! C=12.01 H=1.008 (since it's H2, you multiply 1.008 times 2) Molar mass of CH2=14gCH2 (2 sig figs from the equation) Always remember that you need to divide actual/theoretical So our actual= 84g.mol^-1 theoret...
by Jamie Reniva 1J
Wed Apr 11, 2018 4:19 pm
Forum: Balancing Chemical Reactions
Topic: Balancing equations with fractions [ENDORSED]
Replies: 13
Views: 461

Re: Balancing equations with fractions [ENDORSED]

Stoichiometric coefficients shouldn't be in fraction form because I think that it would indicate that you have to split an atom in half and that's not possible. It is better if you multiply the whole equation by 2.
by Jamie Reniva 1J
Wed Apr 11, 2018 4:15 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 900468

Re: Post All Chemistry Jokes Here

Q: What is the chem formula for "coffee"?
A: CoFe2
by Jamie Reniva 1J
Wed Apr 11, 2018 4:05 pm
Forum: SI Units, Unit Conversions
Topic: Moles mols mol? [ENDORSED]
Replies: 21
Views: 956

Re: Moles mols mol? [ENDORSED]

Mol/mols is an abbreviation for moles, i don't think it matters. The previous replies are correct, just make sure to not confuse moles with "M" (molarity)!
by Jamie Reniva 1J
Wed Apr 11, 2018 3:58 pm
Forum: Properties of Light
Topic: HW #1.7
Replies: 3
Views: 223

HW #1.7

For homework problem 1.7 letter (A), it gave frequency (v) and the constant is already known (c). We can find the wavelength through this way but it is asking for the final answer in nanometers, what steps do we take to convert the current answer into to nanometers? Question from the textbook: "...
by Jamie Reniva 1J
Wed Apr 11, 2018 3:48 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs
Replies: 9
Views: 364

Sig Figs

I noticed in the empirical formula problems in in the post module assignment, some of the elements are rounded off. For example Hydrogen (instead of 1.008, it is stated as 1.0), Oxygen (instead of 15.999, it is used as 16), do we stick to this concept where we round the numbers and not put the exact...

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