CHEMISTRY COMMUNITY

Joanna Mendoza 3J

I've been watching youtube videos that pertain to specific topics I'm confused about. Sometimes it's tricky to find really good ones but I find it really helpful to see someone else explain specific topics I need review on since you can rewatch them.

Joanna Mendoza 3J

I'm not completely sure if the new material we've been learning this week is going to be on the midterm but I was planning on either asking my TA or during one the midterm review sessions that are being planned

Joanna Mendoza 3J

the solutions manual states that the electron configuration for Ga^3+ is [Xe] 4f^14 5d^10 6s^2. why is an electron taken from the f orbital instead of the s orbital to make the d orbital more stable?

Joanna Mendoza 3J

For the ion Ru3+ the solutions manual states that the electron configuration is [Kr]4d^5 instead of [Kr]4d^35 s^2. Can someone explain why the orbitals are taken from the s orbital instead of the d orbital?

Joanna Mendoza 3J

problem: What is the velocity of a neutron of wavelength 100. pm?

when we are given the wavelength in pm or any other unit, do we need to change it to nm before we plug it into our equation?

Joanna Mendoza 3J

Thank you for explaining that clearly!
For part d, how would I determine the kind of electromagnetic radiation that was used?

Joanna Mendoza 3J

the 2 exceptions we need to know for electrong configurations are:
Chromium, Cr: [Ar]3d^54s^1 and Copper, Cu: [Ar] 3d^104s^1
but I also need some clarification on why these exceptions exist.

Joanna Mendoza 3J

The Pauli Exclusion Principle states that no two electrons can share the same combination of four quantum numbers. The electrons in an orbital must have opposite spins in order for their quantum numbers to differ. Since their n, l, and ml are the same, their ms (which refers to the spin of the elect...

Joanna Mendoza 3J

Problem: The velocity of an electron that is emitted from a metallic surface by a photon is 3.6 x 10^3 km.s^-1. (a) What is the wavelength of the ejected electron? (b) No electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50 3 1016 Hz. How much energy ...

Joanna Mendoza 3J

problem: Write the subshell notation (3d, for instance) and the number of orbitals having the following quantum numbers: (a) n=5, l=2; (b) n=1, l=0; (c) n=6, l=3; (d) n=2, l=1. I know that to get the number of orbitals you use 2(l)+1 but can someone explain to me how to get/write the subshell notati...

Joanna Mendoza 3J

Can someone explain the difference between constructive and destructive interference and the importance of both?

Joanna Mendoza 3J

Problem: (a) The frequency of violet light is 7.1 x 10^14 Hz. What is the wavelength (in nanometers) of violet light?
The solution manual shows that 2.998 x 10^8 m.s^-1 is divided by the frequency but I don't know where they got the "2.998 x 10^8 m.s^-1" from

Joanna Mendoza 3J

Can somebody outline some clear steps on how to calculate electron transitions for the H-atom spectrum?

Joanna Mendoza 3J

What is the difference between the Blamer and Lyman series?

Joanna Mendoza 3J

Can someone explain to me the kind of wavelengths that can and can’t eject electrons and why this is so?

Joanna Mendoza 3J

I would say to round off when the decimal is between one point of different ex. 1.1 to 1, the others should probably be multiplied.

Joanna Mendoza 3J

Some steps I wrote down: - write the balanced equation - calculate the molar mass of each reactant and product - convert the known masses of the reactant and product to moles - compare calculated moles to required moles to determine if there is a limiting reactant The limiting reactant is going to b...

Joanna Mendoza 3J

My TA recommended us to review it in the textbook in case it does come up on the test since naming elements and compounds is a chemistry fundamental.

Joanna Mendoza 3J

The actual yield is normally listed in the problem and you're asked to find the theoretical yield through solving a stoichiometry problem. Once you have these two, you'll be able to solve for the percent yield.

Joanna Mendoza 3J

Some rules for significant figures: non zero numbers are always significant, any zero between 2 non zero numbers are significant, and trailing zeros after a decimal point are significant.

CHEMISTRY COMMUNITY

Search found 20 matches

Re: Study Tips

Re: Midterm Topics Covered

hw problem 2A.5

d5 in electron configurations

hw problem 1B.23

Re: hw 1B.15 part c

Re: Electron Configuration Exceptions

Re: Opposite Spin

hw 1B.15 part c

hw problem 1D.21

constructive vs destructive interference

hw problem 1A.7

steps for electron transitions

Blamer and Lyman

electron ejection

Re: Rounding vs. Multiplying

Re: Finding the limiting reaction

Re: Naming compounds

Re: % yield

Re: sig figs