Search found 20 matches

by Joanna Mendoza 3J
Sun Oct 27, 2019 1:26 pm
Forum: Student Social/Study Group
Topic: Study Tips
Replies: 58
Views: 1171

Re: Study Tips

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.
by Joanna Mendoza 3J
Sun Oct 27, 2019 1:23 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm Topics Covered
Replies: 7
Views: 78

Re: Midterm Topics Covered

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
by Joanna Mendoza 3J
Sun Oct 27, 2019 1:14 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: hw problem 2A.5
Replies: 1
Views: 37

hw problem 2A.5

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?
by Joanna Mendoza 3J
Sun Oct 27, 2019 12:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: d5 in electron configurations
Replies: 1
Views: 24

d5 in electron configurations

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?
by Joanna Mendoza 3J
Thu Oct 24, 2019 9:12 pm
Forum: DeBroglie Equation
Topic: hw problem 1B.23
Replies: 4
Views: 64

hw problem 1B.23

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?
by Joanna Mendoza 3J
Sun Oct 20, 2019 4:03 pm
Forum: Photoelectric Effect
Topic: hw 1B.15 part c
Replies: 3
Views: 57

Re: hw 1B.15 part c

Thank you for explaining that clearly!
For part d, how would I determine the kind of electromagnetic radiation that was used?
by Joanna Mendoza 3J
Sun Oct 20, 2019 3:50 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Exceptions
Replies: 5
Views: 47

Re: Electron Configuration Exceptions

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.
by Joanna Mendoza 3J
Sun Oct 20, 2019 3:35 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Opposite Spin
Replies: 5
Views: 54

Re: Opposite Spin

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...
by Joanna Mendoza 3J
Sat Oct 19, 2019 2:43 pm
Forum: Photoelectric Effect
Topic: hw 1B.15 part c
Replies: 3
Views: 57

hw 1B.15 part c

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 ...
by Joanna Mendoza 3J
Thu Oct 17, 2019 6:49 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: hw problem 1D.21
Replies: 2
Views: 35

hw problem 1D.21

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...
by Joanna Mendoza 3J
Sun Oct 13, 2019 8:25 pm
Forum: Properties of Electrons
Topic: constructive vs destructive interference
Replies: 3
Views: 25

constructive vs destructive interference

Can someone explain the difference between constructive and destructive interference and the importance of both?
by Joanna Mendoza 3J
Sun Oct 13, 2019 8:14 pm
Forum: Properties of Light
Topic: hw problem 1A.7
Replies: 3
Views: 38

hw problem 1A.7

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
by Joanna Mendoza 3J
Sun Oct 13, 2019 7:53 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: steps for electron transitions
Replies: 1
Views: 22

steps for electron transitions

Can somebody outline some clear steps on how to calculate electron transitions for the H-atom spectrum?
by Joanna Mendoza 3J
Sun Oct 13, 2019 7:51 pm
Forum: Quantum Numbers and The H-Atom
Topic: Blamer and Lyman
Replies: 1
Views: 30

Blamer and Lyman

What is the difference between the Blamer and Lyman series?
by Joanna Mendoza 3J
Sun Oct 13, 2019 7:48 pm
Forum: Properties of Light
Topic: electron ejection
Replies: 1
Views: 23

electron ejection

Can someone explain to me the kind of wavelengths that can and can’t eject electrons and why this is so?
by Joanna Mendoza 3J
Sun Oct 06, 2019 6:35 pm
Forum: Empirical & Molecular Formulas
Topic: Rounding vs. Multiplying
Replies: 4
Views: 59

Re: Rounding vs. Multiplying

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.
by Joanna Mendoza 3J
Sun Oct 06, 2019 6:29 pm
Forum: Limiting Reactant Calculations
Topic: Finding the limiting reaction
Replies: 3
Views: 39

Re: Finding the limiting reaction

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...
by Joanna Mendoza 3J
Sun Oct 06, 2019 6:21 pm
Forum: Balancing Chemical Reactions
Topic: Naming compounds
Replies: 2
Views: 47

Re: Naming compounds

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.
by Joanna Mendoza 3J
Sun Oct 06, 2019 6:17 pm
Forum: Limiting Reactant Calculations
Topic: % yield
Replies: 5
Views: 65

Re: % yield

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.
by Joanna Mendoza 3J
Sun Oct 06, 2019 6:09 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: sig figs
Replies: 20
Views: 206

Re: sig figs

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.

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