CHEMISTRY COMMUNITY

Katherine Brenner 3H

When you calculate a formal charge and get 1- will that be a formal charge of +1 or -1 because it is an electcron?

Katherine Brenner 3H

Thanks- I was also confused on this topic.

Katherine Brenner 3H

What lecture did we go over this for fall 2019 quarter?

Katherine Brenner 3H

When you add a H+ to a base then it becomes a conjugate acid and vice versa.

Katherine Brenner 3H

Does Dipole Moments indicate polarity also?

Katherine Brenner 3H

How do we know which compound goes first and last when naming?

Katherine Brenner 3H

Molar mass and boiling point are positivley correlated.

Katherine Brenner 3H

Hello

Can someone explain the difference between intra and intermolecular forces and what forces would go under each one?
Thanks

Katherine Brenner 3H

Can an individual molecule be dipole- dipole. Or would we just say that this is a dipole moment within 1 molecule?

Katherine Brenner 3H

I dont remember ever hearing about this so I dont think we need to know it for the final.

Katherine Brenner 3H

What will we need to know for the final for this outline. I dont think we covered it that much in class?

Katherine Brenner 3H

Rebekah Alfred 1L wrote:
Katherine Brenner 3H wrote:Can someone explain how we get that formula?

For example, NH3 will have a VSEPR formula of AX3E because it has three bonded atoms and one lone pair. CH3Cl will have a VSEPR formula of AX4 because it has four bonded atoms and no lone pairs.

Thanks!

Katherine Brenner 3H

Will we ever be asked to calculate the dissociated bond length(it is inside textbook but I dont remember it from class)?

Katherine Brenner 3H

Anyone have a tip for how to memorize all of these compounds!

Katherine Brenner 3H

Will we ever have to calculate the full shrodinger equation for a test?

Katherine Brenner 3H

Do we need to know anything about this equation(particle in a box) for the final? I dont remeber covering this topic in class nor was it on the midterm.

Katherine Brenner 3H

How do we know when something has a 2 in front of it? IE 2dsp^2

Katherine Brenner 3H

Could someone explain the relationship between polarity and melting and boiling points?

Thanks

Katherine Brenner 3H

The shape will not vary because we use the most stable molecule.

Katherine Brenner 3H

Can someone explain how we get that formula?

Katherine Brenner 3H

Could some please write out the different kinds of shapes in the VSEPR and how many bonds and lone pairs that accompany it.

Katherine Brenner 3H

Hydrogen bonds are when a hydrogen bonds with a Nitrogen, Oxygen, or Fluorine.

Katherine Brenner 3H

There is a couple exceptions including some with an expanded octet like Phosphorus and Sulfur. Also other elements have a smaller octect like Hydrogen.

Katherine Brenner 3H

Yes lone pairs do repel more :)

Katherine Brenner 3H

It is important to know that you will only be calculating the formal charge of one element at a time. I made this mistake for a while and it confused me :)

Katherine Brenner 3H

I think of the trend going in a diagonal arrow up to the upper right side. Toward Flourine.

Katherine Brenner 3H

When you have a double bond, you have 2 pi bonds and 1 sigma bond. When you find the hybridization level, you only count the the number of sigma bonds or hybrid bonds.

Katherine Brenner 3H

I think that we will be asked about certain concepts regarding the midterm because the ones he showed in class from last years midterm had a lot of conceptual questions as well as calculations.

Katherine Brenner 3H

I believe that everything larger than 10^-12 is a detectable way.

Katherine Brenner 3H

I would just watch the video module on our class website for this. It is about 1 hr long but super helpful in understanding how to do the calculations and understanding of the concept as well.

Katherine Brenner 3H

I believe that resonance structures normally have the same formal charges.

Katherine Brenner 3H

I believe that polarizability refers to the ability to be able to easily loose or gain electrons. Is this correct?

Katherine Brenner 3H

Can someone breifly explain what we will be expected to know about dipoles on our midterm?

Katherine Brenner 3H

Hello

Is there any easy way to remember the octet exceptions?

Katherine Brenner 3H

Is the speed of electromagnetic radiation always constant?- even when frequency decreases or wavelength decreases?

Katherine Brenner 3H

Can someone describe the difference for the number of valence electrons in different metals/nonmetals and in the akalines?

Katherine Brenner 3H

Does anyone know when the midterm review sessions are for next week? ( week of midterm).

Katherine Brenner 3H

Is anyone in a study group that I could join for the midterm exam? It could be helpful to have peer input when trying to study for the midterm.

Katherine Brenner 3H

Does anyone have any easy to remember studying techniques for remembering trends in the periodic table?

Katherine Brenner 3H

Will you have lone pairs during an ionic bond?

Katherine Brenner 3H

What elements are an exception to the octet rule?

Katherine Brenner 3H

Does anyone know where we could find an example of this in the textbook (please post a page number if possible)?

Thanks

Katherine Brenner 3H

I believe that this is more for formatting reasons. I think that this helps separate the element from the electrons count. Also, keep in mind that noble gases are also bracketed.

Katherine Brenner 3H

Would someone mind breaking down the steps to calculating subshells because i am seeming to have difficultly with it?

Thanks

Katherine Brenner 3H

The answer to both of your questions are yes- nonmetals are closer to acheiving and octet. This is because of this position on the periodic table.

Katherine Brenner 3H

Brackets indicates something is a noble gas. I was originally confused on this as well so dont worry!

Katherine Brenner 3H

Same Haley!

Thank you so much to everyone who responded because now it makes sense.

Katherine Brenner 3H

How do we tell what level an electron typically ends up in? (IE n=1, n=3)

Katherine Brenner 3H

Could someone explain when an electron will move up to an excited energy state?

Katherine Brenner 3H

Does that mean that the larger an electrons wavelength is, the more wave-like properties it possesses?

Katherine Brenner 3H

So a molecule uses activation energy to start making collisions but runs out of energy and thus uses threshold energy?

Katherine Brenner 3H

I believe the Quantum world is a long unit- that what Proff said in lecture on the first day. I think this chapter will last until next week.

Katherine Brenner 3H

If there is not enough energy to bounce the electron off the metal surface, then the photoelectric effect will not happen.

Katherine Brenner 3H

Hello

He just went over this last Monday. We just need to understand the equation and have a general idea of the characteristics and ideas that led to him creating the equation.

Katherine Brenner 3H

As long as it is from the right topic then its fine. IE right now we are in "Quantum World" topic. My TA said it would be good to have a mix of different problems from different sections assigned but I think that is just prefer that way the TAs know you are doing all of the homework. Howev...

Katherine Brenner 3H

The number of significant figs in the question is the amount we are supposed to be using in our answer. For example if the question has 1.34 grams co2 then our answer should be 3 sig figs such as 8.23 x 10^28

Katherine Brenner 3H

It should be noted that water can weaken an ionic bond so in that case a covalent bond may be stronger.

Katherine Brenner 3H

It should be noted that water can weaken an ionic bond so in that case a covalent bond may be stronger.

Katherine Brenner 3H

Hi Nate

Dimensional analysis is the way we solve problems and use the multiplication techniques such as 21 grams 1mole/107 grams and the units cancel out.

Katherine Brenner 3H

Hello

Can someone please explain to me what Pancks law means in terms of quanta and photons. Im confused.

Katherine Brenner 3H

Hello

This was the same problem Dr. Lavelle worked out in class. wavelength= hc/E is the equation he used in class by rearranging E=hv

Katherine Brenner 3H

I am also confused on the correlation between light intensity and frequency. Would someone mind explaining the difference between the wave vs light model.

Katherine Brenner 3H

Im pretty sure that the grades will be posted on ccle the following week.

Katherine Brenner 3H

Ionic bonds are stronger than covalent bonds because covalent bonds share an electron.

Katherine Brenner 3H

I do not think that we need a bluebook for the exam.

Katherine Brenner 3H

I think because it was assigned as HW, we should definitely know how to do it. It says on the syllabus that 1 out of 8 homework problems will be on the exam so it is important to know Molarity.

Katherine Brenner 3H

I think that we will need to know the nomenclature compounds. I would not worry about this too much as we will probably use this alot in this course so we will probably know the most common ones without memorizing!

Katherine Brenner 3H

This is a great question. I think for the sake of this class we should probably be careful to always assume that water will be the excess reactant, although in the real scientific world that would make a lot of sense.

Katherine Brenner 3H

Just a scientific calc should be good! I dont think we will be needing anything that has to do with graphing for the exam.

Katherine Brenner 3H

Im pretty sure that you could just assume 100 grams like we do when we calculate the empirical and molecular formulas.

Katherine Brenner 3H

Hello

I am having the same problem- Im never really sure how many sig figs to use in each question. I normally just use the amount that they give inside the question (if they give a specific number).

Katherine Brenner 3H

I always balance the element that comes up the least first. I have noticed that writing the amount of each element below it while I am balencing can be very helpful.

Katherine Brenner 3H

Section D is really helpful for that in the textbook. I do think that we will need to know what some of the compounds are like for nitrite. I think that as the course goes on you will become more familiar with certain compounds so there will not need to be much memorizing because we will be using th...

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