CHEMISTRY COMMUNITY

nikitasridhar_1b

HI has a larger atomic radius and therefore a longer and weaker bond, making it weaker, and a stronger acid bc it can dissociate easily

nikitasridhar_1b

Hi,
Could someone please explain the answer to this question from the review worksheet to me

nikitasridhar_1b

How do you do this question? how do you use table 17.4 to answer it?

nikitasridhar_1b

how do you find the oxidation number of the metal?

nikitasridhar_1b

what is the relation btwn charge and number of binding sites? i thought the no. of binding sites had to do wiht the number of lone pairs

nikitasridhar_1b

do we need to memorize the formula for edta?

nikitasridhar_1b

in the ligand co32-, why is it that only 2 pairs of electrons are considered binding sites when there are actually 8 lone pairS?

nikitasridhar_1b

can't co32- technically have 8 binding sites since two of the oxygen atoms have 3 pairs of electrons and one has 2 pairs of electrons?

nikitasridhar_1b

I think that's correct but I believe it forms a pi bond (not positive though)

nikitasridhar_1b

look at the number of regions of electron density around the central atom you are concerned with, ignoring the rest of the compound. (for ex: if there are lone pairs of electrons on parts of the compound that aren't the central atom, it doesn't matter)

nikitasridhar_1b

by the symmetry of the overall molecule (after drawing the lewis structure w/ vsepr in mind)

nikitasridhar_1b

ionization energy increases from left to right and decreases down a group. if the question changes the cation, the molecule with the cation with a higher ionization energy has a greater ionization energy difference. if the question changes the anion, the molecule with the anion with a lower ionizati...

nikitasridhar_1b

if there was no lone pair the bond angle would be 180 degrees. due to the repulsion of the lone pair, the bond angle is reduced from this number

nikitasridhar_1b

in 1b, how come the molecule can have lone pairs? i thought it couldn't

nikitasridhar_1b

but since chlorine needs to gain an electron shouldn't its oxidation state be -1

nikitasridhar_1b

what's the correct format for drawing a coordinate bond? In highschool I remember drawing a line with an arrow; is there any specific notation?

nikitasridhar_1b

I wasn't able to attend lecture last class and am unsure about how to calculate formal charge. Is it just the number of electrons to add (resulting in a negative charge) or number of electrons to remove (resulting in a positive charge)

nikitasridhar_1b

sorry forgot to specify! chapter 1

nikitasridhar_1b

in the answer key, it says the uncertainty eq is ∆p*∆x=1/2*h
i thought it was ∆p*∆x>=h/4pi

i'm getting different answers to those in the answer key and am confused as to the method of solving such questions (like 1.43 for example)

nikitasridhar_1b

sometimes the uncertainty is not given and only the position is given (like in 1.43). how can we incorporate this into the equation when this is the actual momentum value, not the momentum value multiplied by the uncertainty.

nikitasridhar_1b

what do you mean by double the uncertainty? wouldn't you just multiply the uncertainty for momentum for example with the actual value of momentum? also im confused because sometimes the uncertainty is not given and only the position is given (like in 1.43). how can we incorporate this into the equat...

nikitasridhar_1b

does electron affinity measure the energy required to gain an electron or the attraction to an electron? for example an element far right on the periodic table would hav a high nuclear charge, and it would be easy to add an electron. does this mean the electron affinity is high (because the attracti...

nikitasridhar_1b

how do you do question 16 when both the initial and final n values are unknown?

nikitasridhar_1b

for the topics covered in test 2, what units are the equations in terms of? some of them are in kg and such but im not sure which ones

nikitasridhar_1b

what kind of questions related to the equation can we expect to see on the midterm?

nikitasridhar_1b

electron affinity measures the energy change when an electron is added to an atom, whereas electronegativity refers to the attraction an atom has to an electron. one measures an energy difference and the other is a scale of attraction. they are both related, however, as electron affinity decreases (...

nikitasridhar_1b

the first shell (n=0) only has one subshell, so it only has s orbitals. after that the second shell (n=1) has two subshells, and therefore has s and p orbitals. the third shell (n=2) has 3 subshells and therefore has s,p, AND d.

nikitasridhar_1b

what effect does each have on the electrons emitted?

nikitasridhar_1b

is this equation coming in test 2?

nikitasridhar_1b

In questions will we receive H as a function? Is it always sin/cos?

nikitasridhar_1b

what does increasing the frequency/ light intensity do? are they the same thing? if not what's the difference?

nikitasridhar_1b

For test 2, will the questions be only numericals or will we have to answer qualitative questions too?

nikitasridhar_1b

what does planck's constant signify?

nikitasridhar_1b

Is the limiting reactant the reactant with the number of moles only if the mass is the same? if the mass is different how do you determine the limiting reactant

nikitasridhar_1b

Hi,

I know what the formula is for the Bohr frequency condition, but I'm not sure about what it signifies. What is the condition and what does it apply to?

nikitasridhar_1b

I got the concentration of the diluted solution as 0.05M, and so shouldn't the number of mols of the compound when the volume is 0.1L be 0.2? not sure why the answer is 0.01

nikitasridhar_1b

I think we will be penalized for incorrect sig figs in the tests after this one though

nikitasridhar_1b

Since 6.022*10^23 is the number of particles (atoms, molecules, etc) in one mole, and since oxygen is repeated 11 times in the formula, we multiply the number of moles of oxygen by 6.02*10^23 to find the number of atoms in one mole. We multiplt 11 to this number since oxygen is repeated 11 times. I ...

nikitasridhar_1b

I think so

nikitasridhar_1b

Mole is the noun, referring to the concept, and mol is the unit for moles, as far as I remember.

nikitasridhar_1b

there are 3 units because it is easier to use some when dealing with certain temperature scales. On a day to day basis, it is easier to use celsius or farenheit because we are not dealing with large numbers or very positive/negative temperatures for which kelvin might be more suitable.

nikitasridhar_1b

what kind of dog do chemists have? laboratory retrievers

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