CHEMISTRY COMMUNITY

Angel Gutierrez 2E

How do you determine whether a compound is acidic or basic with the conjugate bases or acids of its acid or base?

Angel Gutierrez 2E

What is the connection between electronegativity and oxyacids? How do you determine the electronegativity between three atoms?

Angel Gutierrez 2E

How do you know which compound is a cation or anion. I'm pretty confused at the feedback. Does someone mind explaining this?

Angel Gutierrez 2E

For sapling q 5, I am unable to calculate the H+ ion while using 10-pH, which should be 10^-2.44.

Should I take the temperature into consideration when calculating the H+ ion?

Angel Gutierrez 2E

How do you identify a coordinate covalent bond? What is the difference between a coordinate covalent bond and a regular covalent bond?

Angel Gutierrez 2E

What makes a molecule or compound a base or acid? And how can you identify between the two?

Angel Gutierrez 2E

I understand that the lewis base is an electron-pair donor and the base is a proton acceptor, and it would be vice versa for the lewis acids and acid. But, is there any other difference or distinction between the two?

Angel Gutierrez 2E

Is a coordination number the amount of ligands? Or do you also take into account the transition metal and total the amount of ligands and the transition metal as the coordination number?

Angel Gutierrez 2E

Give the oxidation state of the metal species in the complex [Co(NH3)5Cl]Cl2 .

I understand that the central atom (transition metal) cannot be a negative oxidation number. however, it would make sense to determine its oxidation like so...

[Co + NH3 + Cl= Cl]
x +5(0) +1(-1)= 2(-1)
x-1=-2
x=-1

Angel Gutierrez 2E

does the order of the molecular formula affect the way you draw the structures? FOor example, in H2CCCH2, are two hydrogens supposed to be on each ends?

Angel Gutierrez 2E

Does the way you position the atoms matter? I think I have structured all the molecules correctly, but it keeps marking it incorrect.

Angel Gutierrez 2E

Hello,

Would it be possible to get a shrink factor to decrease the subscripts of the empirical formula? In other words, does it make sense to have a smaller molecular formula mass than a empirical formula mass and get a number less than 1 that would half the empirical formula?

Angel Gutierrez 2E

Why would a linear shape describe a nonpolar molecule such as CO2?

Angel Gutierrez 2E

What is the reasoning behind the fact that lone pairs decreasing the bond angle? Do lone pairs have a stronger repulsion force?

Angel Gutierrez 2E

Why is the H20 molecule bent? Why are the lone pairs in Oxygen next to each other when there should be a repulsion in lone pairs?

Angel Gutierrez 2E

In Dr. Lavelle's Friday (Nov. 20) lecture, he explains that a polar molecule does not have dipole moments that cancel out. In cis-dichloretene, the dipole moments point away from each other. In a non polar molecule, the dipole moments, still point away from each other but they are still considered t...

Angel Gutierrez 2E

How are you able to visualize the presence of sigma bonds in a molecular structure. I understand the bonding of s-orbitals, and how they merge between a bond. They appear to get closer when they bond, is that the same thing when visualizing two atoms, do they get closer due to the sigma bonds?

Angel Gutierrez 2E

In Dr. Lavelle's lecture, he combines the atomic orbitals from the same shell (n=2) to make hybrid orbitals. Is hybridization the process of making atomic orbitals hybrid?

Angel Gutierrez 2E

oxidation means that the atom, molecule, or ion loses an electron.

Angel Gutierrez 2E

What is the difference between an induced dipole-dipole and a dipole-dipole reaction?

Angel Gutierrez 2E

Would the most stable resonance structure be considered the structure with a formal charge of 0?

Angel Gutierrez 2E

Sapling q. 9 asks to determine the oxidation number of chlorine in the perchlorate ion? How would I go about determining the oxidation number?

Angel Gutierrez 2E

How are you able to identify dispersion forces? The difference in electronegativity, when it is small, it is a covalent bond. Is there a relationship between electronegativity and dispersion forces?

Angel Gutierrez 2E

Why are there only two oxygens in the nitrite ion and three oxygen atoms in the phosphite ions?

Angel Gutierrez 2E

Why would NH3 be considered a lewis base?

Also, are all anions considered lewis bases because they typically have more electrons to share than cations and stable atoms?

Angel Gutierrez 2E

I understand that Helium can only have two valence electrons, since they only carry one, but why are there other exceptions to the octet rule, and why does that occur?

Angel Gutierrez 2E

For q. 2, it asks to draw the lewus structure of the polyatomic ions, does this mean that they are ionic? If so, why are both elements in NH4 are nonmetals?

Angel Gutierrez 2E

I am confused on how to determine if the fourth quantum number. I dont understand the concept between this number as well, all i know is that there are two possible solutions which are 1/2 and -1/2 if i am correct. Thank you!

Angel Gutierrez 2E

Can someone please explain to me the concepts between the blocks Dr. Lavelle mentioned that are on the periodic table. Is this a reason to why the electron config. of an element can skip subshells like 3d.

Angel Gutierrez 2E

I am confused on why you would jump from 3p subshell to a 4s subshell and ignore the 3d subshell in some elements?

Angel Gutierrez 2E

Would you say your major holds heavy weight when applying to med school? Is there a contrast between an applicant who has a degree in psych and another with a physci degree? Thank you so much for your advice!

Angel Gutierrez 2E

you would use de brogile equation in order to find the kinetic energy which is 1/2mv^2. when rearragning the debrogile equation, you can solve for v to plug v back into the kinetic energy equation!

Angel Gutierrez 2E

Does anybody know the rounding range that will get you the correct answer for the midterms?

Angel Gutierrez 2E

Madison Wong 1G wrote:How do we know that n1=2? Is it characteristic of visible light in general or did it require solving?

it is based on the balmer series, which is the visible light and it starts at n=1

Angel Gutierrez 2E

Allan Nguyen 2E wrote:I would just make sure to check for unit conversions. Don't forget that the joule unit in Planck's constant for the De Broglie equation is 1 kg.m^2.s^-2

Does this mean that you do not input the value as 6.626*10^-34 J.s into the equation?

Angel Gutierrez 2E

When you have values with a neg exponent and they are the denominator in the equations, do you change the negative exponents as a positive since they become part of the denominator?

Angel Gutierrez 2E

Also, I'm not sure if this would help but i converted the wavelength from nm into meters.

Angel Gutierrez 2E

yes, the mass should be converted into kg since it is usually measured in those units.

Quick q, did you set up your de brogile equation as velocity=planks constant*mass/wavelength? I also can't get it right and im not sure what im doing wrong

Angel Gutierrez 2E

Wouldn't you have to subtract the final - initial? and the problem says that the electron was lowered down to lower energy levels so n=1-n=5? I don't understand what I'm doing wrong because i subtract it the other way and I use -h*R/n^2 to get the change in energy for one level to subtract by the ot...

Angel Gutierrez 2E

What is the max. number of electrons that could be ejected from this metal by a burst of photons (at some other frequency) with a total energy of 4.25*10^-7 J? I understand that you have to divide the energy of one photon by the total energy to get the maximum number of electrons but how would i get...

Angel Gutierrez 2E

Can the speed of light equation differ from 3.00 *10^8 m.s^-1 since Professor Lavelle mentioned that the equation will be given in the Module for this topic. Will we be given a reference sheet for the exam? Or can the speed of light equation change depending on the problem you're working on?

Angel Gutierrez 2E

I am confused on what the threshold energy means when talking about the photoelectric effect. I understand that the work function is the minimum amount of energy required to remove an electron from the metal. But are the threshold energy and the work function related in any way?

Thank you!

Angel Gutierrez 2E

Ex. Calculate the frequency of light emitted by a hydrogen atom when an electron makes a transition from the fourth to the second principal quantum model. I understand how professor lavelle changed the equation from e=hv to v=e/h to find the frequency. But i do not understand where the fractions suc...

Angel Gutierrez 2E

Why does the frequency and kinetic energy for the answer in #1 differ if they are proportional to each other? Why is it that a pulse of light containing a 100 photons is only lambda, v, and 100e?

Angel Gutierrez 2E

Can someone explain how Professor Lavelle combined the equations, E=h*v and c=lambda*v, to lambda=h*c/E for Lec 2 of Wk 2?

Angel Gutierrez 2E

Can someone explain how Professor Lavelle combined the equations, E=h*v and c=lambda*v, to lambda=h*c/E for Lec 2 of Wk 2?

Angel Gutierrez 2E

In the module example, Dr. Lavelle multiples the ratios times three after finding dividing the ratios from the smallest ratio. And he got 1:1.33:1. Why did he have to multiple this ratio to then get the empirical formula?

Angel Gutierrez 2E

Hello,

for part c, I am multiplying the number of atoms times avogadro's constant. Are you supposed to get the same value for both elements?

Angel Gutierrez 2E

How do you find the formula units for part b after you find the amount of O atoms in part a (which i think should be 1.2*10^24 if im not mistaken)?

Also, how would you find the amount of water molecules in MgSO4?

Thank you!

Angel Gutierrez 2E

Hello,

Would I be using a mole to mole ratio for this problem? I'm confused on how to set up my conversion equation.

Angel Gutierrez 2E

Am I supposed to convert the 1 mol of Ag into pm using its radius using a conversion factor? I'm a bit confused.

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