Search found 15 matches

by Linda Arroyo 3J
Thu Nov 15, 2018 2:33 am
Forum: Determining Molecular Shape (VSEPR)
Topic: The difference between placing lone pairs in certain positions?
Replies: 3
Views: 94

The difference between placing lone pairs in certain positions?

So I was curious to know if there is a preference or difference in placing lone pairs in a molecular structure at the top and bottom or on the side next to each other ? Below there should be the attachments, is there a difference in where we place these lone pairs if they both repel each other and o...
by Linda Arroyo 3J
Thu Nov 15, 2018 2:24 am
Forum: Lewis Structures
Topic: Lewis Structure of H2C(NH2)COOH
Replies: 1
Views: 84

Lewis Structure of H2C(NH2)COOH

Hey Everyone,

So I am having trouble figuring out how to understand this lewis structure of H2C(NH2)COOH, how would we structure the elements in the parantheses?
Thanks.
by Linda Arroyo 3J
Fri Nov 02, 2018 10:35 pm
Forum: Quantum Numbers and The H-Atom
Topic: 2.51 (6th edition)
Replies: 1
Views: 85

2.51 (6th edition)

Hey everyone, so I'm having trouble with problem 2.51 : How many unpaired electrons are predicted for the ground-state configuration of each of the following atoms: (a) Bi; (b) Si; (c) Ta; (d) Ni?

- I would have assumed that for b) it would be like 4, but the key says 2. can someone help ? thank you
by Linda Arroyo 3J
Fri Nov 02, 2018 10:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Elements we have to memorize for the Midterm
Replies: 4
Views: 272

Re: Elements we have to memorize for the Midterm

I dont think so, they will provide the periodic table. But maybe for sure dont forget about the f-block, I tend to forget it.
by Linda Arroyo 3J
Fri Nov 02, 2018 9:01 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ground state and excited state ?
Replies: 2
Views: 158

Ground state and excited state ?

whats the difference between ground state and excited state atoms? how can you tell either?
by Linda Arroyo 3J
Thu Oct 25, 2018 10:01 pm
Forum: Photoelectric Effect
Topic: UA practice problem frequency of light
Replies: 3
Views: 458

UA practice problem frequency of light

6. The work function for lithium is 4.6 x 10−19 J.
a. What is the lowest frequency of light that will cause photoelectric emission?
The ANswer is 6.9 x 1014 Hz

I am just confused on what equation they used to solve this.
by Linda Arroyo 3J
Wed Oct 24, 2018 10:08 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Q. 1.57
Replies: 2
Views: 108

Q. 1.57

Q. Lines in the Balmer series of the hydrogen spectrum are observed at 656.3, 486.1, 434.0, and 410.2 nm. What is the wavelength of the next line in the series? I;m having difficulty with this problem, I understand what the next n would be, it would be 7. But with knowing that what would I do next? ...
by Linda Arroyo 3J
Tue Oct 23, 2018 11:09 pm
Forum: Properties of Light
Topic: conceptual questions on the test 2?
Replies: 3
Views: 124

conceptual questions on the test 2?

will there be any conceptual questions like having to order things by frequency or electromagnetic radition or any other conceptual questions ? just wondering
by Linda Arroyo 3J
Thu Oct 18, 2018 12:17 pm
Forum: Properties of Light
Topic: problem 1.25
Replies: 2
Views: 104

problem 1.25

Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 589 nm. How much energy is emitted by (a) an excited sodium atom when it generates a photon Now as I was working on the problem, I assumed we would use the equation E=hc/ \lambda . but on the solution manual they use E=hcf...
by Linda Arroyo 3J
Wed Oct 17, 2018 9:35 pm
Forum: Properties of Light
Topic: Problem 1.7 conversion of meters to nanometers
Replies: 2
Views: 71

Problem 1.7 conversion of meters to nanometers

So on problem 1.7, I'm confused on how they converted the final answer of 4.2x10^-7 to 420 nm. because nm is 10-9 . can someone please help. thank you
by Linda Arroyo 3J
Tue Oct 16, 2018 4:00 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: converting moles to grams
Replies: 3
Views: 322

converting moles to grams

Hey everyone, I just wanted to make sure that I am converting correctly. If I am converting from moles to grams, would I just multiply the given moles with the molar mass of the given compound? for example: L. 3 B) Calculate the mass of Li3N that will produce 0.650 mol LiH. would i multiply the LiH ...
by Linda Arroyo 3J
Fri Oct 12, 2018 12:59 am
Forum: Balancing Chemical Reactions
Topic: question on "combustion" and "cooking"
Replies: 3
Views: 289

question on "combustion" and "cooking"

So I just had a question on using terms to write out chemical equations to balance them out. if we are not given the entire chemical reaction, from the terms used like "combustion" and "cooking" we should already know that for example 02, co2, and h20 will be in the equation corr...
by Linda Arroyo 3J
Fri Oct 12, 2018 12:50 am
Forum: Properties of Light
Topic: problem 1. 9 sixth edition
Replies: 4
Views: 93

Re: problem 1. 9 sixth edition

heres the question: A college student recently had a busy day. Each of the student’s activities on that day (reading, getting a dental x-ray, making popcorn in a microwave oven, and acquiring a suntan) involved radiation from a different part of the electromagnetic spectrum. Complete the following t...
by Linda Arroyo 3J
Fri Oct 12, 2018 12:44 am
Forum: Properties of Light
Topic: problem 1. 9 sixth edition
Replies: 4
Views: 93

problem 1. 9 sixth edition

Hello, I'm having trouble finding the energy of the photon on the chart, the known info on the 3rd row. so I found the wavelength, but im having trouble converting 300MHz. How would I convert it to scientific notation because I tried it and the answer didnt reflect the one on the solution manual. pl...
by Linda Arroyo 3J
Fri Apr 06, 2018 7:01 pm
Forum: Molarity, Solutions, Dilutions
Topic: G.5 Part A) Molarity [ENDORSED]
Replies: 9
Views: 361

G.5 Part A) Molarity [ENDORSED]

So for part A, I tried to find the molarity but I kept getting 0.004979 and I do not know what I am doing wrong, On the solutions its something else, can someone please help me :)

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