CHEMISTRY COMMUNITY

Hee Sang Kim 3L

Why does change in rate constant have no effect on activation energy? In the course reader, it says that catalyst speeds up the reaction (K) by lowering the Ea.

Hee Sang Kim 3L

We learned how to draw vinyl as a parent chain but how is it supposed to look like as a substituent?

Hee Sang Kim 3L

In the course reader, why is it 4-ethyl-2,2-dimethyl-hexane instead of 3-ethyl-5,5-dimethyl-hexane? why does it not follow the "1st named group gets lower number" rule? I know the course reader says "#chain to give lowest # to substituents". Does that mean since theres 2 methyl b...

Hee Sang Kim 3L

Are all elements (excluding noble gas) are electrophiles if they are not negatively charged? For example C is electrophile but Carbon ion is nucleophile?

Hee Sang Kim 3L

What is energetically favorable and is it the same thing with being exothermic?
Does a energetically favorable reaction not be spontaneous?

Hee Sang Kim 3L

I have 2 questions from workbook quiz2 preparation winter 2014. #10 from it asks what is the activation energy for the reaction based on the K value that we have. Are we supposed to know how to do that for quiz2? If we do, please teach me #12, it tells you to graph the data, find the slope and get t...

Hee Sang Kim 3L

Why does HW question 15.37 C) not require the volume in the calculation? Do we not have to calculate the molarity?

Hee Sang Kim 3L

Are we supposed to know how to derive all these integrated rate law equations and half life equations?

Hee Sang Kim 3L

does " ΔU=3/2RT" only apply to monotomic ideal gas?

Hee Sang Kim 3L

How exactly does the salt bridge prevent one side getting to postitive and another getting too negative? What is the detailed process?

Hee Sang Kim 3L

Why is delta G= W max at constant T and P?

Hee Sang Kim 3L

Container A is fi lled with 1.0 mol of the atoms of an ideal monatomic gas. Container B has 1.0 mol of atoms bound together as diatomic molecules that are not vibrationally active. Container C has 1.0 mol of atoms bound together as diatomic molecules that are vibrationally active. The containers all...

Hee Sang Kim 3L

There was a textbook question asking "Calculate the change in molar entropy of an ideal gas when it is compressed isothermally to one-third its initial volume. " Is ideal gas implaying that is 1 mol of gas? How do we know the mole of gas

Hee Sang Kim 3L

Water expands when it freezes. How much work does 100. g of water do when it freezes at 0.0 C and pushes back the metal wall of a pipe that exerts an opposing pressure of 1070 atm? The densities of water and ice at 0.0 C are 1.00 gcm3 and 0.92 gcm3, respectively. The textbook answer is -0.86KJ.

Hee Sang Kim 3L

Is there something wrong with textbook question 8.1A Selftest on page264? Because I feel like the answer multiplied the mass by the density not dividing by the density

Hee Sang Kim 3L

What is the exact difference of reversible process and irreversible process and why does reversible process always has more work done?

Hee Sang Kim 3L

Why is the heat equation always negative? Or is it only when it is releasing energy

Hee Sang Kim 3L

In one of the course reader practice final exam, it says Br2 2+ is diamagnetic. But it is supposed to be paramagnetic right?

Hee Sang Kim 3L

Do we have to know the calculation involved Ka1 and ka2?

Hee Sang Kim 3L

Is it in the textbook?

Hee Sang Kim 3L

For question 69 b), where do you get the Ka of Al3+

Hee Sang Kim 3L

Why is SO2 a lewis acid. Apparently it can accept an electron pair, but why and how?

Hee Sang Kim 3L

Why were HSO4- and H2PO4- exceptions from anions making solution basic again?

Hee Sang Kim 3L

It is said that longer the A-H bond, more acidic it is. That means HI is more acidic than HCl due to the bigger size of Iodine that causese longer bond. However, second property was depedent on electronegativity, and examples were given so that CL-O-H is more acidic than I-O-H. Doesnt this contradic...

Hee Sang Kim 3L

Hi i was confused between how to apply sigfig rules Basically if we look at the textbook question 11.57, the solution manual uses the intermediate sigfig which means it rounds up for the addition part. However, thats not how i learned in highschool and i was really confused. Do we round up the sigfi...

Hee Sang Kim 3L

I realized that some of the question use the name "iron" when naming coordinate compounds and some of others use "ferrate". How do we know when to use what

Hee Sang Kim 3L

Sulfate ion has two ways of drawing its lewis structure. One is to follow the octet rule and having single bond for each oxygen each perfectly satisfies the octet rule. However, since sulfate can hold more than 8 electrons, it is better to draw the lewis structure with 2 double bond oxygens and 2 si...

Hee Sang Kim 3L

Hi, in lecture, Dr. Lavelle said that 2p and 2s orbitals of Carbon is higher than those of oxygen. Why? I did not catch what he said.

Hee Sang Kim 3L

It is said that highly distorted electron in atoms and ions are highly polarizable and that result in more covalent caracter. Why? isnt it supposed to be have more ionic ?

Hee Sang Kim 3L

Hi Nick. Beryllium chloride has a linear shape and beryllium is an octet exception because beryllium ion loses an electron when it forms bond, and that means it has the same electron configuration as Helium, which is a duplet instead of an octet.

Hee Sang Kim 3L

OMG sorry i was really dumb, this time i figured out. So basically u gotta write down the electron configuration and see. For example, if it is asking for unpaired electron of silicon, silicon's electron configuration is [Ne]3s2 3p2. According to Hund's rule, due to electron repulsion, electron in s...

Hee Sang Kim 3L

Hi, you look at the periodic table and see which group it belongs to. For example, if you look at Berylium, its on the group 2, so it has 2 out of 8 electron, which means 8-2=6. so 6 unpaired elctrons. If you look at Oxygen, it is technically in group 16, but you need to ignore the d block which is ...

Hee Sang Kim 3L

Apparently, electron configuration for Thorium is [Rn] 6d2 7s2. However, I thought it would be [Rn] 5f1 6d1 7s2 since its on the F block right after the first 6d element (Actinium). Help!

CHEMISTRY COMMUNITY

Search found 33 matches

Rate constant and Ea

Vinyl substituent

4-ethyl-2,2-dimethyl-hexane

Neutral element

Energetically favorable

workbook quiz2 preparation winter 2014 question.

HW question 15.37

Half life equations

internal heat change of monotomic ideal gas

Salt bridge

Delta G

Textbook question 9.35

Textbook question clarification

Re: Textbook question

Textbook question

Reversible and irreversible

Heat

Br2 2+

Hw question 77

Re: AlCl3

AlCl3

SO2

Exceptions of anions

Strength of acidity

Significant figure

name of iron

SO4 2-

CO mo diagram

polarizability in ionic model

Re: Octet Exception (Course Reader)

Re: Unpaired Electron

Re: Unpaired Electron

Electron configuration for Thorium