CHEMISTRY COMMUNITY

annie_finneran_1K

what is the difference between these 2 and how do we find them for coordination compounds?

annie_finneran_1K

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 :)

annie_finneran_1K

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.

annie_finneran_1K

just lewis structures

annie_finneran_1K

does test 3 include only outline 3 or does it also include outline 4?

annie_finneran_1K

you can lose up to 1 point on each page of the test if sig figs are wrong i think

annie_finneran_1K

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...

annie_finneran_1K

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

annie_finneran_1K

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

annie_finneran_1K

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

annie_finneran_1K

search the code word (a mystical creature with one horn) and select the endorsed post

annie_finneran_1K

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

annie_finneran_1K

add 3 electrons to the outermost shell of the neutral ground state configuration

annie_finneran_1K

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...

annie_finneran_1K

I would say yes. it is good to get into the habit of it anyways.

annie_finneran_1K

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.

annie_finneran_1K

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...

annie_finneran_1K

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

annie_finneran_1K

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...

annie_finneran_1K

yep! always use the least number of sig figs in the given in your final answer :)

annie_finneran_1K

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 ...

annie_finneran_1K

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.

annie_finneran_1K

if the peaks are not in sync and thus the waves not in sync then it will always be destructive interference.

annie_finneran_1K

I think he said 10^-15 is the cutoff. anything below that is too small.

annie_finneran_1K

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...

annie_finneran_1K

I do not think this is in test 2. Test 2 includes only up to 1.5 and the uncertainty equation is 1.6

annie_finneran_1K

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.

annie_finneran_1K

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!

annie_finneran_1K

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.

annie_finneran_1K

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...

annie_finneran_1K

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?

annie_finneran_1K

I think he said to use whatever value the question gives, so on tests he will probably tell us which value to use.

annie_finneran_1K

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...

annie_finneran_1K

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.

annie_finneran_1K

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 :)))

annie_finneran_1K

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?

annie_finneran_1K

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

CHEMISTRY COMMUNITY

Search found 37 matches

coordination number vs. oxidation number [ENDORSED]

basics of hybridization

Re: ranking

Re: VSEPR on test 3?

test 3 [ENDORSED]

Re: Midterm Significant Figures [ENDORSED]

Re: Past Midterm Question

Re: conceptual q (based on q 1.43)

Re: Past Midterm Question

Re: Photoelectric Problems

Re: Practice Test (Unicorn) Answer Key

Re: 1.69

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

Re: cation vs anion

Re: Sig Figs [ENDORSED]

Re: 2.25 [ENDORSED]

electron affinity vs ionization energy

Re: homework 2.59

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

Re: Use of Appropriate Sig Figs

Re: Example 1.7

Re: Wavelengths and their corresponding electromagnetic spectrum

Re: Wave peak differences

Re: Cutoff for wavelike properties [ENDORSED]

Re: increasing frequency/ light intensity

Re: test 2

Re: increasing frequency/ light intensity

Re: equation for the photoelectric effect

Re: Homework 2?

Re: Intensity in terms of Quantum Mechanics and Classical Mechanics

Correct Units?? [ENDORSED]

Re: HW 1.7 (speed of light) clarification

Re: Moles mols mol? [ENDORSED]

Re: Mass percentage

writing out conversions in one long line vs. steps

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

Re: 300 vs 300. [ENDORSED]