CHEMISTRY COMMUNITY

Ethan Low 1L

Yeah the number can only be -1/2 or +1 and at the review session they mentioned that its important to include the positive/ negative sign to signify direction of spin.

Ethan Low 1L

Its considered when it is Larger than 10^-15 m!

Ethan Low 1L

Scott_Anderson_3J wrote:This is a bit late, but you might want to check out Alpha Chi Sigma, the chemistry fraternity here. They offer free tutoring by appointment. Here's a link to their site: http://www.chem.ucla.edu/axe/tutoring.html

Did not know that this was a resource! Thanks so much for this tip!

Ethan Low 1L

What might help is when you are keying each number into the calculator, use all of the decimal places, additionally sometimes when you hit enter and use ans key in all of the decimal places because sometimes it rounds it up.

Ethan Low 1L

To what extent do we need to memorize this?

Ethan Low 1L

We'll probably only need to know how to write out the electronic configuration, some of my friends in biochemistry use computer models/apps to draw out the orbitals and their orientation, I don't think we'll need to do that since it hasn't really been emphasized in class.

Ethan Low 1L

Delocalized electrons are electrons in a molecule, ion or solid metal that are not associated with a single atom or a covalent bond. Looking online it seems that delocalization can have slightly different meanings in different fields." In organic chemistry, this refers to resonance in conjugate...

Ethan Low 1L

Ionization energy is defined as the amount of energy it takes to remove an electron. According to the periodic table, there is a trend where it increases from left to right because the atomic radius gets smaller in that direction, so electrons experience more attraction to the positive nucleus and a...

Ethan Low 1L

The element with the lowest ionization energy is normally used as the central atom

Ethan Low 1L

Electronegativity is the ability of an atom to attract electrons towards itself whereas electron affinity is the amount of energy released when an atom gains an electron.

Ethan Low 1L

Question: How do you become the most cited scientist of all time?

Answer: Change your name to "et al".

'Ba dum tsssssst'

Hope everyone is having a good weekend and lets get through this course together! (:

Ethan Low 1L

The states should not really matter for dilution reactions especially for the level of chemistry that we are doing for this class. So I don't think we need to factor in the states, unless it were something like enthalpy change and switching from sublimation (from solid to gas) and we need to calcula...

Ethan Low 1L

It depends on the type of elements that are bonding together in the reaction. Metal and non-metal then an electron is passed on from the metal to the non-metal so that they would each have a stable octet shell, in covalent bonding it is between 2 non-metals and the electrons are shared between the t...

Ethan Low 1L

A good practice might be to write out a table on the side for both the reactants and the products, I saw my TA do this in discussion. Also try and balance out the elements that appear the least FIRST, then work your way through the other elements!

Hope that helps (:

Ethan Low 1L

According to the law of conservation, atoms cannot be created or destroyed. I guess this is what happens in nature, however I think that with nuclear reactors we can convert atoms into energy. I don't think this will be covered in 14A or in our undergrad chem... cause that seems to be out of the sco...

Ethan Low 1L

We need to find the limiting reagent after balancing the equation according to their stoichiometric ratios. Finding the limiting reagent is important because this will be the deciding factor pertaining to how much the of the reagents actually react, normally amongst the reagents one of them will be ...

Ethan Low 1L

Avogadro's number or constant is basically the same constant number 6.0221 X 10^23. The way you should think about it is the number of atoms, within 1 mole of that particular atoms (its referring to the number of atoms) Note that different elements would have different sizes of each individual parti...

Ethan Low 1L

Molarity is the concentration of a solution expressed as the number of moles of solute per litre of solution.
That is M= Moles of solute/ solution ( in liters)

Ethan Low 1L

Sapling is kind of like the launchpad for the LS7 Series on Macmillian, if you purchase the bundle that includes sapling that would be the online E textbook. I bought all of the bundle from Dr Lavelle's link that he had shared for about $190 and it includes the E-book, sapling, solutions, and loose ...

Ethan Low 1L

I think I remember hearing that if we have the correct answer for tests, even if you did a short cut or mental calculations and skipped a few steps you will still receive credit. However, I think if you do not have the correct final answer but have shown the steps and working that display the proper...

Ethan Low 1L

I think something that helps with the sig fig issue is under appendix 1 in the mastering chemistry textbook, part 1C "Scientific Notation", i think reading that would help illuminate a lot of misconceptions/ preconceived notions behind how to present significant figures.

Ethan Low 1L

What are some reasons why the actual yield for an experimental reaction is not equal to the theoretical yield? Do we need to be prepared to explain why this happened if given a lab scenario? Also this formula is important for calculating percentage yield = ( Actual Yield/ Theoratical Yield X 100%) ...

Ethan Low 1L

What are some reasons why the actual yield for an experimental reaction is not equal to the theoretical yield? Do we need to be prepared to explain why this happened if given a lab scenario? The theoretical yield for an experiment would normally be greater than the actual yield for an experiment, t...

Ethan Low 1L

What topics will the first test be covering? If i'm not wrong the topics covered for the first test will be a review of high school topics, fundamentals of chemistry, balancing equations, knowing how to find limiting reagent, calculation mole, finding number of atoms (Avogadro's constant which is 6...

CHEMISTRY COMMUNITY

Search found 24 matches

Re: Spin Magnetic Quantum #

Re: Waves

Re: Tutoring? [ENDORSED]

Re: Calculator rounding

Re: Rydberg equation [ENDORSED]

Re: Electron Configurations

Re: Delocalization

Re: Ionization Energy

Re: Central Atom

Re: Electronegativity vs. Electron affinity

Re: Post All Chemistry Jokes Here

Re: States of Matter

Re: Bonds

Re: H 1

Re: When are atoms lost or created?

Re: general questions

Re: Unit for Avogadro's Number

Re: What is Molarity?

Re: Accessing the E-textbook [ENDORSED]

Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]

Re: All students read this sig fig post [ENDORSED]

Re: Theoretical vs. Actual Yield

Re: Theoretical vs. Actual Yield

Re: Test 1