CHEMISTRY COMMUNITY

Timothy Kao 1B

You've probably heard this before but honestly I find doing as many practice problems as possible relating to material I'm not familiar with to be extremely helpful. The more problems you do, the more you'll be exposed to it and the more you'll get used to it. Also, this lets you get experience with...

Timothy Kao 1B

They should be given. If not then the problem will contain enough information to solve for them.

Timothy Kao 1B

I found reading the review of the properties of gases in the course reader (starts on page 122) to be helpful. The way I think of equilibrium in terms of change in temperature is with relation to the molecules. If the temperature increases in a system, then the molecules will move faster. As a resul...

Timothy Kao 1B

Specifically I3 or one of the I3 ions?

Timothy Kao 1B

Thank you!

Timothy Kao 1B

Thank you!

Timothy Kao 1B

I seem to recall that in class we had the arrows point in the direction that the electrons were traveling, but in the textbook the arrows go from the negative charge to the positive charge. Which convention should we be using?

Timothy Kao 1B

Will exam 2 also be held in CS 76 from 10-11:50? Just wanted to make sure.

Timothy Kao 1B

One thing I always make sure to remember is that usually the atom with the lowest electronegativity is the atom that becomes the central atom. I also tried memorizing which atoms had exceptions to the octet rule, such as Sulfur which can exceed an octet and Boron which can have an incomplete Octet,...

Timothy Kao 1B

I found this video that I thought was helpful. Hope it helps!

https://www.youtube.com/watch?v=mQpNjm7xB30

Timothy Kao 1B

I asked my TA a similar sort of question yesterday and he said that either way is fine.

Timothy Kao 1B

For part b, the question asks for the lewis structure of COCl2. The answer gives a double bond linking carbon and oxygen, and I was just wondering if it would also be acceptable to draw the double bond between carbon and one of the chlorines. If not, why not?

Timothy Kao 1B

3.27 is also a similar type of problem.

On the basis of the expected charges of the monatomic ions, give the chemical formula of each of the following compounds: (a) thallium(III) chloride; (b) aluminum sulfide; (c) manganese(IV) oxide.

Timothy Kao 1B

Do you mind providing a picture of the problem or replicating it below? On the basis of the expected charges on the monatomic ions, give the chemical formula of each of the following compounds: (a) magnesium arsenide; (b) indium(III) sulfide; (c) aluminum hydride; (d) hydrogen telluride; (e) bismut...

Timothy Kao 1B

I think the most we'll have to do with naming compounds and such is if a problem gives you the name of a compound rather than the chemical formula since that's what some of the homework problems did, like with some of the problems in chapter 3 concerning Lewis structures. I'm not 100% sure we'll eve...

Timothy Kao 1B

One thing I always make sure to remember is that usually the atom with the lowest electronegativity is the atom that becomes the central atom. I also tried memorizing which atoms had exceptions to the octet rule, such as Sulfur which can exceed an octet and Boron which can have an incomplete Octet, ...

Timothy Kao 1B

In the test schedule it says that Test 2 would be on Thursday the 27th, but in the email Professor Lavelle just sent out, it says that Test 2 will be Tuesday the 25th. What's the actually date of the test?

Timothy Kao 1B

Usually you find out how many unpaired electrons there should be after you determine how many electrons the the entire molecule should have and how many bonds there are between the different atoms. The unpaired electrons are the ones that let you reach the amount of electrons you should have in total.

Timothy Kao 1B

Section D in fundamentals goes over how to derive the chemical formula from a compound's name.

Timothy Kao 1B

Could someone actually go over the whole question? I'm not too clear on how to do this question.

Timothy Kao 1B

Thank you!

Timothy Kao 1B

Thanks! This really helped!

Timothy Kao 1B

What's the formula used to solve parts b and c?

Timothy Kao 1B

I was just wondering if I could get some clarification on what energy level was considered the initial and what was considered the final. Based on the wording, I thought that the initial n = 4 and final n = 2 as the exact wording is "transition from n = 4 to n = 2," but based on the work d...

Timothy Kao 1B

In this question, the formula for sodium carbonate was not given, does anyone know if we have to write the formulas by ourselves in the test? Thanks! One of the fundamental chapters goes over how to determine a chemical formula based on the name and vice versa. It's part of the review of high schoo...

Timothy Kao 1B

From my experience, when you're first starting to do these types of problems, it's a lot of guessing and checking, but after you've done enough practice problems, you get to the point where when you see the decimals you'll intuitively know what you should multiply by.

Timothy Kao 1B

You should leave off rounding as much as possible until the end of the problem in order to ensure as much accuracy as possible and factor in the dog figs at the very end.

Timothy Kao 1B

I also have the same question. Would we just have 2 dog figs in the decimals?

CHEMISTRY COMMUNITY

Search found 28 matches

Re: Tips on studying

Re: Ka and Kb values

Re: Temperature

Re: Why I3 is linear?

Re: Exam 2

Re: Which direction does the dipole arrow face?

Which direction does the dipole arrow face?

Exam 2

Re: Tips for completing Lewis Structures

Re: Homework problem 3.25

Re: Problem 3.45

Homework 3.33

Re: Homework problem 3.25

Re: Homework problem 3.25

Re: Naming compounds

Re: Tips for completing Lewis Structures

Test 2 Date

Re: Unpaired electrons

Re: Chemical formula?

Re: question on hw 2.29

Re: Homework 1.13 Rydberg equation

Re: Homework 1.25

Homework 1.25

Homework 1.13 Rydberg equation

Re: homework G5

Re: Whole Number Coefficients

Re: Sig Figs in a problem with addition & multiplication [ENDORSED]

Re: sig figs in electronic transition problem