Search found 37 matches

by annie_finneran_1K
Sat Jun 02, 2018 9:54 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number vs. oxidation number [ENDORSED]
Replies: 4
Views: 309

coordination number vs. oxidation number [ENDORSED]

what is the difference between these 2 and how do we find them for coordination compounds?
by annie_finneran_1K
Sat May 26, 2018 3:49 pm
Forum: Hybridization
Topic: basics of hybridization
Replies: 18
Views: 568

basics of hybridization

I am a bit confused on hybridization. can anyone direct me to a video or give an explanation of what it is and how to solve problems involving it? thank you :)
by annie_finneran_1K
Fri May 25, 2018 7:16 am
Forum: Resonance Structures
Topic: ranking
Replies: 11
Views: 452

Re: ranking

by the formal charge. The most important is the lowest energy and the one with formal charges on each element closest to zero as possible.
by annie_finneran_1K
Wed May 23, 2018 7:15 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR on test 3?
Replies: 3
Views: 115

Re: VSEPR on test 3?

just lewis structures
by annie_finneran_1K
Wed May 16, 2018 7:49 am
Forum: Bond Lengths & Energies
Topic: test 3 [ENDORSED]
Replies: 3
Views: 146

test 3 [ENDORSED]

does test 3 include only outline 3 or does it also include outline 4?
by annie_finneran_1K
Wed May 09, 2018 1:05 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Significant Figures [ENDORSED]
Replies: 4
Views: 242

Re: Midterm Significant Figures [ENDORSED]

you can lose up to 1 point on each page of the test if sig figs are wrong i think
by annie_finneran_1K
Wed May 09, 2018 1:02 pm
Forum: General Science Questions
Topic: Past Midterm Question
Replies: 2
Views: 223

Re: Past Midterm Question

it is because the question is saying if you add more photons of the same energy will electron speed increase. it won't because you are changing intensity but not the actual energy of each question. the wording is confusing. it is not saying the photons each have more energy, it is saying there are m...
by annie_finneran_1K
Wed May 09, 2018 7:49 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: conceptual q (based on q 1.43)
Replies: 1
Views: 118

Re: conceptual q (based on q 1.43)

the uncertainty is change in position so delta x. if you know delta x you can solve for delta v which is uncertainty in velocity.

since we are solving for an electron, we know its mass, and we are given position so we can find v based on the equation
by annie_finneran_1K
Tue May 08, 2018 8:02 pm
Forum: General Science Questions
Topic: Past Midterm Question
Replies: 2
Views: 223

Re: Past Midterm Question

yes, because higher energy photons would cause electrons to be ejected at a higher velocity.

Ephoton= work function + KE of electron

work function is constant

so as Ephoton increases, KE and thus speed of electron increases


so i am not sure why the answer is no
by annie_finneran_1K
Mon May 07, 2018 7:03 am
Forum: Photoelectric Effect
Topic: Photoelectric Problems
Replies: 4
Views: 259

Re: Photoelectric Problems

it is conceptual but also need to do problems involving equation

energy of photon = work function + KE of ekectron

1/2mv^2
E=hv
these are equations used for the calculations
by annie_finneran_1K
Sun May 06, 2018 4:37 pm
Forum: Student Social/Study Group
Topic: Practice Test (Lyndon) Answer Key
Replies: 1
Views: 238

Re: Practice Test (Unicorn) Answer Key

search the code word (a mystical creature with one horn) and select the endorsed post
by annie_finneran_1K
Sun May 06, 2018 7:40 am
Forum: Photoelectric Effect
Topic: 1.69
Replies: 2
Views: 146

Re: 1.69

what part are you confused on for this problem? A good hint is to use the equations Ephoton=work function + KE of electron

and E=hv
by annie_finneran_1K
Sat May 05, 2018 8:28 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configuration for P^3- [ENDORSED]
Replies: 2
Views: 103

Re: Electron configuration for P^3- [ENDORSED]

add 3 electrons to the outermost shell of the neutral ground state configuration
by annie_finneran_1K
Sat May 05, 2018 8:27 am
Forum: Ionic & Covalent Bonds
Topic: cation vs anion
Replies: 14
Views: 425

Re: cation vs anion

cation ion is + charged like Ca2+ anion is - charged like Cl- I remember it by anion starts with a, just like antonym, and the antonym is the opposite so I think of negative. Any type of memory cue that will make sense to you will work. Maybe think how cats are positively cute, so cations are +. wha...
by annie_finneran_1K
Fri May 04, 2018 9:46 pm
Forum: Properties of Light
Topic: Sig Figs [ENDORSED]
Replies: 3
Views: 176

Re: Sig Figs [ENDORSED]

I would say yes. it is good to get into the habit of it anyways.
by annie_finneran_1K
Thu May 03, 2018 3:03 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2.25 [ENDORSED]
Replies: 3
Views: 150

Re: 2.25 [ENDORSED]

helium is also in the 1s orbital and has 2 electrons, so therefore the 1s orbital can have 2 electrons despite hydrogen having only one.
by annie_finneran_1K
Wed May 02, 2018 8:58 pm
Forum: Trends in The Periodic Table
Topic: electron affinity vs ionization energy
Replies: 2
Views: 81

electron affinity vs ionization energy

I am a bit confused on the difference between these 2 concepts and the patterns in the table for each. Question 2.67 talks about which element will have higher electron affinity and it seems to follow the same trend as ionization energy. is this a trend that we can follow throughout the table or are...
by annie_finneran_1K
Wed May 02, 2018 8:53 pm
Forum: Trends in The Periodic Table
Topic: homework 2.59
Replies: 3
Views: 73

Re: homework 2.59

go to the chem website and click solution manual errors. but also they do not have the same ionic radius, because ionic radius decreases across a period and those elements are all in the same period
by annie_finneran_1K
Wed May 02, 2018 5:33 pm
Forum: Trends in The Periodic Table
Topic: Removing the 2nd electron is always harder [ENDORSED]
Replies: 5
Views: 133

Re: Removing the 2nd electron is always harder [ENDORSED]

the first electron removed is the outermost, meaning it is farthest from the nucleus. The nucleus is positive and electrons are negative, meaning they are attracted to each other. The outermost electron is easiest to take away because the strength of attraction to the nucleus is least because the el...
by annie_finneran_1K
Wed May 02, 2018 5:29 pm
Forum: Significant Figures
Topic: Use of Appropriate Sig Figs
Replies: 2
Views: 214

Re: Use of Appropriate Sig Figs

yep! always use the least number of sig figs in the given in your final answer :)
by annie_finneran_1K
Wed May 02, 2018 9:48 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Example 1.7
Replies: 2
Views: 151

Re: Example 1.7

because its +or- 1 it is really 2 because it is either plus 1 or minus 1 so the overall range is actually 2. does that make sense? like if a dog's weight fluctuated around 50 lbs with +-1, then its weight is either 49,50,or 51 lbs, but the overall range in the uncertainty of its weight at a time is ...
by annie_finneran_1K
Fri Apr 27, 2018 7:36 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelengths and their corresponding electromagnetic spectrum
Replies: 2
Views: 86

Re: Wavelengths and their corresponding electromagnetic spectrum

I would say know that 400nm-700nm is visible light and then radio and infared are longer and uv, xray and gamma are shorter. knowing the order is more important than exact numbers i think.
by annie_finneran_1K
Fri Apr 27, 2018 7:34 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Wave peak differences
Replies: 2
Views: 69

Re: Wave peak differences

if the peaks are not in sync and thus the waves not in sync then it will always be destructive interference.
by annie_finneran_1K
Fri Apr 27, 2018 7:33 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Cutoff for wavelike properties [ENDORSED]
Replies: 2
Views: 77

Re: Cutoff for wavelike properties [ENDORSED]

I think he said 10^-15 is the cutoff. anything below that is too small.
by annie_finneran_1K
Tue Apr 24, 2018 7:59 am
Forum: Photoelectric Effect
Topic: increasing frequency/ light intensity
Replies: 5
Views: 250

Re: increasing frequency/ light intensity

increasing the frequency will allow electrons to be emitted and be emitted with a higher speed. if the frequency is good enough to eject an electron, then increasing brightness will increase the number of electrons ejected, because there will be more photons and photons act in 1:1 ratio with electro...
by annie_finneran_1K
Mon Apr 23, 2018 10:16 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: test 2
Replies: 2
Views: 150

Re: test 2

I do not think this is in test 2. Test 2 includes only up to 1.5 and the uncertainty equation is 1.6
by annie_finneran_1K
Mon Apr 23, 2018 10:13 pm
Forum: Photoelectric Effect
Topic: increasing frequency/ light intensity
Replies: 5
Views: 250

Re: increasing frequency/ light intensity

increasing the frequency changes the wavelength and thus changes the type of light and energy of the light.

increasing the intensity is just increasing the number of photons and essentially the brightness.
by annie_finneran_1K
Mon Apr 23, 2018 10:11 pm
Forum: Photoelectric Effect
Topic: equation for the photoelectric effect
Replies: 1
Views: 71

Re: equation for the photoelectric effect

work plus KE is what you use to figure out the energy of the photon if you are given work function and velocity of the electron that was ejected.


photon energy minus KE is what you use to figure out work function/minimum light needed to eject an electron. hope that helps!
by annie_finneran_1K
Thu Apr 12, 2018 3:41 pm
Forum: Properties of Electrons
Topic: Homework 2?
Replies: 1
Views: 107

Re: Homework 2?

He said homework can be anything recently covered, so you can do work from the fundamentals and just problems from chapter 1 that you recognize from class. He said any 7 questions that you have not done are okay I believe.
by annie_finneran_1K
Thu Apr 12, 2018 3:35 pm
Forum: Properties of Light
Topic: Intensity in terms of Quantum Mechanics and Classical Mechanics
Replies: 2
Views: 97

Re: Intensity in terms of Quantum Mechanics and Classical Mechanics

I believe in classical mechanics, the intensity of a wave is based on amplitude, or height of the wave. In quantum mechanics, and with light, the intensity of the wave is not correlated to amplitude, but rather by the frequency/wavelength of each photon. In the photoelectric effect, it is not the nu...
by annie_finneran_1K
Thu Apr 12, 2018 2:25 pm
Forum: SI Units, Unit Conversions
Topic: Correct Units?? [ENDORSED]
Replies: 8
Views: 289

Correct Units?? [ENDORSED]

How do we know whether a formula needs g or kg? some formulas assume g while others assume kg. What is a good rule of thumb? Is it normally that mechanics equations such as 1/2mv used kg whereas other equations in quantum mechanics use grams?
by annie_finneran_1K
Thu Apr 12, 2018 8:42 am
Forum: Properties of Light
Topic: HW 1.7 (speed of light) clarification
Replies: 4
Views: 127

Re: HW 1.7 (speed of light) clarification

I think he said to use whatever value the question gives, so on tests he will probably tell us which value to use.
by annie_finneran_1K
Thu Apr 12, 2018 8:38 am
Forum: SI Units, Unit Conversions
Topic: Moles mols mol? [ENDORSED]
Replies: 21
Views: 923

Re: Moles mols mol? [ENDORSED]

Hello! I had a quick question for L1 in the fundamentals section outline. Without using a calculator, estimate what amount of Br2 (in moles) can be obtained from 0.30 mol ClO2 in the reaction 6 ClO21g2  2 BrF31l2 S 6 ClO2F1s2  Br21l2. for this they simply want you to see that Br2 is in a 1:6 rati...
by annie_finneran_1K
Thu Apr 12, 2018 8:32 am
Forum: Molarity, Solutions, Dilutions
Topic: Mass percentage
Replies: 8
Views: 348

Re: Mass percentage

I would say most likely that wouldn't happen as that does not make sense. If they do not add up to 100 maybe double check your math, or maybe another element is simply not being mentioned.
by annie_finneran_1K
Sat Apr 07, 2018 5:09 pm
Forum: SI Units, Unit Conversions
Topic: writing out conversions in one long line vs. steps
Replies: 16
Views: 559

writing out conversions in one long line vs. steps

do people find it more helpful to write multiple conversions in one step or to break the problem up into multiple steps? I get confused with it and wanted to see what other people do/prefer/think is easiest and allows one to better understand the concept behind it. any help would be appreciated :)))
by annie_finneran_1K
Sat Apr 07, 2018 5:02 pm
Forum: Empirical & Molecular Formulas
Topic: Determining Molecular Formula Based on Name of Molecule [ENDORSED]
Replies: 5
Views: 187

Re: Determining Molecular Formula Based on Name of Molecule [ENDORSED]

does it matter the order of the atoms in the formula? Like CHO vs OHC? (i know this is a bad example). and if order matters then how do we know which to put first? basically whichever is listed first?
by annie_finneran_1K
Sat Apr 07, 2018 5:00 pm
Forum: Significant Figures
Topic: 300 vs 300. [ENDORSED]
Replies: 8
Views: 518

Re: 300 vs 300. [ENDORSED]

so the decimal is what sig figs revolves around correct? aka when in doubt just look and see the importance of a decimal?

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