CHEMISTRY COMMUNITY

YeseniaGomez_1L

The smaller the atomic ration and the greater electronegativity mean a greater ionic character. Since the trends for these increase as you go right and up on the periodic table you will find the elements with greater ionic character there. The person above is actually wrong because NaBr has greater ...

YeseniaGomez_1L

I suggest you first figure out the Lewis structure then see if the 4 include any lone pairs, if there is a lone pair it is a square planar and so the angles are different, becuse the lone pairs decrease it through repulsion.

YeseniaGomez_1L

From what I know, the point is just to redistribute the electrons even if the amount remains the same. We redistribute them to make them suitable for chemical bonds through factors like energy and shape. Hope that helps

YeseniaGomez_1L

I know this topic is from a while ago, but after the test we just got back, I am confused as to what resonance is now. I thought it was just like a variation to the structure given. I am not sure what are the rules or how to properly give a resonance structure. Anything would help, or going over the...

YeseniaGomez_1L

You can also use the principle quantum numbers of the element to determine how many electrons it can hold. Typically, the highest number of electrons that can fit in any given shell = 2n². To clarify, it depends on the atom. This equation provided can be used to find the number of the electrons but...

YeseniaGomez_1L

to find the valence electron of a transition metal I would try using the electron configuration, it would require you to use the (n-1) concept. For the energy levels you subtract one when you are working with transition metals. Then the amount of electrons in the last energy level would be your vale...

YeseniaGomez_1L

Usually you can follow the rule on F O N Cl (Br I). Electronegativity increases from right to left, meaning that it is less likely to be in the center of the Lewis structure. If the molecule they asked for was ONF, because out of the three elements N is the least electronegative, it would be in the...

YeseniaGomez_1L

To explain the concept simply rather than the process and add to the answer above, I understand that polarization power is the ability of a cation to distort an anion (has to do ore with the cation) while polarizability is how an anion becomes polarized by a cation (has to do more with the anion). S...

YeseniaGomez_1L

I am still confused on how you find which element goes in the center when doing lewis structure. For example in question 3.51 the book asks for 2 lewis structures for HClO, in the solution one of the structures has O in the center and the other has Cl in the center. I don't understand how to get the...

YeseniaGomez_1L

I don't really understand how you all are finding radicals. For example question 3.55 asks us to identify which of the following are radicals: NO2-, CH3, OH, CH2O.
How do you know which are radicals?

YeseniaGomez_1L

I think it is helpful to just give yourself time to process more conceptual questions. If there is such a topic, it helps to just sit and think it out, even explain it to yourself or someone else. Drawing it out also seems really helpful, I think I will try it next time!

YeseniaGomez_1L

Thanks so much: the replies really cleared it up! A follow-up question: if the correct lewis structure is a combination of the possible "correct" ones, why would we still need to calculate formal charge? Is that just to determine the result of resonance? Resonance states that some Lewis s...

YeseniaGomez_1L

I believe starting at the d orbitals, this rule no longer applies because these elements can hold more than 8 electrons (same with p and f). I think the TA's also explained it as the elements on the 3rd row or lower that break this rule, so you can see it like that on a test.

YeseniaGomez_1L

Just to explain what the previous comments stated, in class we only use the constant with hydrogen, this is because the model only works with a one electron system (such as hydrogen, but it would work for others with one electron only).

YeseniaGomez_1L

Endri Dis 1J wrote:So to clarify, we didn't need include ms which is just the basic -1/2and +1/2?

No, I believe we didn't need to include ms (-1/2and +1/2)

YeseniaGomez_1L

There are examples made easy on this site: http://www.kentchemistry.com/links/bond ... isDots.htm
It mainly focuses on ionic bonds so maybe it can help you identify them.

YeseniaGomez_1L

Hund's rule explains when the electrons start pairing on the orbitals, but does anyone understand why the Pauli exclusion principle limits this to 2 electrons?

YeseniaGomez_1L

I agree with everyone about but put easier The hund’s rule basically just says that electrons will enter the empty orbitals first, then start pairing when all are full.

YeseniaGomez_1L

I’m not sure about matching the questions, but if you don’t want to spend a lot on another textbook you could just buy the pdf version, it’s kind of difficult to get to the pages you need quickly though since you have to scroll through a lot.

YeseniaGomez_1L

Also why do cations in the d block lose their s orbital electrons before their d orbital electrons? I think it has to do with the energy of the 3d orbitals being slightly less than that of the 4s. This link explains a lot: https://www.chemguide.co.uk/atoms/properties/3d4sproblem.html Hope that help...

YeseniaGomez_1L

I was trying to do 1.33 on my own, but I got confused and looked at the solutions manual which confused me more. Does anyone understand how it is solved in the solutions manual, I now get how they got the equations but where did they get those numbers? (for part A)

YeseniaGomez_1L

There is another question like this already posted, according to people who already took the test you should know x rays< UV< infrareds < microwaves.
Someone also mentioned to know red light= 700nm and violet= 400nm

YeseniaGomez_1L

According to the graphics on photoelectric effect the light is ultraviolet.

YeseniaGomez_1L

The Lyman and Balmer series were very briefly mentioned in lecture, I did not understand what each meant. All I was able to get was that the Lymer series somehow has to do with UV and the Balmer with inferred light. Does anyone remember what these terms mean?

YeseniaGomez_1L

I am looking at my notes and in one of the examples from class, our professor wrote E subscript 4= 1/16 x hR, can someone explain where the 1/16 came from?

YeseniaGomez_1L

A vacuum is basically an empty space, as in there is no other molecules to affect the experiment. So in these vacuums gaseous pressure is much less than atmospheric pressure.

YeseniaGomez_1L

Adding on, theoretical yield is calculated using the amount of reactants to figure the maximum amount of product. This is because theoretical yield assumes best case scenario, that everything in the experiment will go perfectly planned but there is cases in real life where some of the reactants, for...

YeseniaGomez_1L

The coefficients must be in whole numbers so you would have to multipy the whole equation (both sides, like in a math problem) by 2 to get rid of the fraction.

YeseniaGomez_1L

It is basically just like simplifying in math. Once you have the molecular formula you simplify using the greatest common number that you can divide by. For example lets say we have C6H12, then you can simplify by dividing what you have by 6 since both numbers are divisible by 6 to get CH6. Don't fo...

YeseniaGomez_1L

I think it is easier to learn it as one process, either you can find the molecular formula using the empirical or the other way around. Finding the molecular formula first seems like a shorter process to me. First you multiply the given total mass by the percents of composition given, the mass you g...

YeseniaGomez_1L

When I practice these problems, I usually round to the nearest whole number when I get something that .90 or above, so far this has worked good for me and the person who replied before says rounding .70 and .8 may give you weird answers. I would suggest that if you are unsure the you should multiply...

YeseniaGomez_1L

The way I see it is as a normal math problem. In math when you have a number multiplying by the stuff in parenthesis you are supposed to distribute. Similarly when you have something like Mg(N3)2, you could see it in this way and distribute the 2, in other words you would multiply the number inside ...

CHEMISTRY COMMUNITY

Search found 32 matches

Re: Ionic Character

Re: 4 ligands shape?

Re: Meaning of hybridization

Resonance Review

Re: Electrons in Valence Shell

Re: Lewis Structures with Transition Metals

Re: Finding the central element on the Lewis structure

Re: Polarizing power vs polarizability

Finding the central element on the Lewis structure

Re: Radical HW 3.59

Re: Conceptual Questions

Re: resonance

Re: Octet Rule [ENDORSED]

Re: H-Atom

Re: Midterm Question

Re: Ionic vs Covalent

Pauli Exclusion Principle

Re: Hund's Rule [ENDORSED]

Re: Issues with 7th Edition Textbook

Re: d block electron configuration

1.33 using De Broglie

Re: Wavelengths and their corresponding electromagnetic spectrum

Re: Photoelectric Effect Module Question [ENDORSED]

Lyman and Balmer Series

work example in class from April 16

Re: What is a vacuum?

Re: actual vs. theoretical yield [ENDORSED]

Re: Balancing equations with fractions [ENDORSED]

Re: Molecular to Empirical [ENDORSED]

Re: Formula steps

Re: Rounding molar ratios

Re: Subscripts [ENDORSED]