CHEMISTRY COMMUNITY

Lily Emerson 1I

you just need to do 14-(-log(1.1)) since you already know that the concentration of the new mixture is .55 - just multiply that by 2 moles of HO- to get the concentration

Lily Emerson 1I

all amphoteric substances (can act as both acids and bases) are amphiprotic, but amphiprotic substances specifically can donate and accept hydrogen ions. not all acid/base reaction make use of hydrogen ion exchange

Lily Emerson 1I

Kw is a water constant, so if you know the concentration of OH- you can find the concentration of H3o+

Lily Emerson 1I

i think it's typically like 1x10^-18

Lily Emerson 1I

i guess it could help with figuring out the shape of a molecule? unsure if it has any other important values that we've talked about

Lily Emerson 1I

just a compound with two or more ligands on the central atom

Lily Emerson 1I

Why is the shape of ICl3 T-shaped instead of trigonal planar or trigonal pyramidal?

Lily Emerson 1I

molecules don't need to have an odd number of lone pairs to be polar (h2o only has 2 lone pairs on the oxygen), but basically the lone pairs push the electrons on the other atoms away from their atom, which makes a molecule polar

Lily Emerson 1I

nitrogen has a lower electronegativity since it's closer to the left (or further away from fluorine), so it goes in the center

Lily Emerson 1I

when calculating formal charges of ions, do we add/subtract the indicated charges on the atoms that they influence? or do we just use the typical number of valence electrons?

Lily Emerson 1I

i think you might not be able to use them since PV=nRT is for gas and m1v1=m2v2 is for liquid solutions - not 100% sure though

Lily Emerson 1I

I'm not sure if there's any formula for bond length (at least not one that we've covered) but generally triple bonds are shorter than double bonds which are shorter than single bonds. it has to do with the fact that when you share more electrons, they're more strongly drawn to the nuclei of the atom...

Lily Emerson 1I

the negative sign just means that bound electrons have lower energy than free electrons. the E(infinity) indicates that, since a free electron could be thought of as just being in a very far-off shell (high n value)

Lily Emerson 1I

my TA told us that there wasn't enough information to answer this question, so they only checked for he amount of C and H that we found

Lily Emerson 1I

probably go to office hours

Lily Emerson 1I

the cartesian axis is just the 3D axis used to describe the shape of the orbital, like in math classes how you can draw vectors on 3D graphs. the lobe orientation is based on where the lobe lies on this axis

Lily Emerson 1I

s, p, d, and f are short for sharp, principle, diffuse, and fundamental based on the type of spectral lines the orbitals make

Lily Emerson 1I

just kinda forgot this in my notes, but while im on the topic is there any kind of cutoff for when we really consider an object having a wavelength?

Lily Emerson 1I

Organic compounds pretty much alway combust into water and co2, so the balances equation is 2C13H10 + 31O2 -> 26CO2 + 10H20

Lily Emerson 1I

I find it easier to think of them more like values with margins of error, so delta P and delta X are ranges of values where the true value is somewhere in the interval.

Lily Emerson 1I

all the formulas and constants for this course were on the front cover of the last test, I don't think you have to worry about memorizing them

Lily Emerson 1I

we divide the velocity of the electron by planck's constant to isolate the frequency (v) and then plug this frequency equation in to c=v $\lambda$
to find the wavelength of the radiation.

Lily Emerson 1I

pretty much! the kinetic energy is just the energy that the electrons have from the photons after they've been knocked off the metal.

Lily Emerson 1I

h=6.626 x 10^-34, which is planck's constant. v is the frequency of blue light, which is the 6.4 x 10^14 that you'd found before

Lily Emerson 1I

I guess sig figs are used to just so that we have a system to base our calculations off of such that we'll all get the same answer as long as we do it correctly. It limits the variation in how frequently we round and to which decimal place, which i guess helps to keep answers consistent across the b...

Lily Emerson 1I

Generally carbon comes first, then hydrogen, then the remaining elements in alphabetical order.

Lily Emerson 1I

I used to write out the number of each element below the equations so that I could visualize it better and then look for common factors to balance chemical equations. You could also set up a system of equations with variable coefficients before each molecule in the reaction and balance it that way, ...

CHEMISTRY COMMUNITY

Search found 27 matches

Re: French Toast Number 27 Part B

Re: Amphoteric and amphiprotic

Re: 12.15

Re: Wave-like Properties of Electron

Re: Significance of Coordination Number?

Re: Chelate? [ENDORSED]

Problem 4.9

Re: lone pairs and polarity

Re: 3.45 quick question

Formal charge with ions

Re: PV=nRT

Re: Bond Length

Re: midterm Q.7b [ENDORSED]

Re: Test 1. Q7.

Re: Solutions for tests

Re: 2.13

Re: Why does 4s fill up before 3d?

does everything have a wavelength

Re: Q4

Re: ∆P and ∆X

Re: Memorizing formulas test 2

Re: Example 1.5 in the textbook [ENDORSED]

Re: Kinetic Energy [ENDORSED]

Re: Calculating the energy of a photon [ENDORSED]

Re: Why are sig figs important?

Re: Molecular/Empirical Formulas

Re: Balancing the Equation