CHEMISTRY COMMUNITY

Michelle Yu 1L

Rachel Colbath 2G wrote:How would we know that the chlorine is bigger than the methyl group when arranging the second most stable conformation?

Chlorine has an atomic mass of 35.45 while methyl (CH3) is about 15 (add up the all the atomic mass. C=12 H=1). Therefore Chlorine is bigger.

Michelle Yu 1L

How do you know it is 4 mol x 2 mol?

Michelle Yu 1L

How is mass=50.0g when it is given 50.0 ml of water?

Michelle Yu 1L

For 8C, Isn't the geometric isomer suppose to be trans and not cis since both substituents are equatorial position.

Michelle Yu 1L

which requires more heat: breaking one mole of carbon-carbon single bonds or melting one mole ice.

Why does breaking one mole of carbon-carbon single bonds require more heat?
Does breaking bonds require more heat in general compared to other things?

Michelle Yu 1L

It's a minus because it's the oxidation version of the reaction (noticed that they flipped it so that the electrons are on the right side of the equation) When they did the math, they subtracted the reduction potential. That's why they substracted a positive number. I am still confused. When I was ...

Michelle Yu 1L

Why is n=4?

Michelle Yu 1L

How did E=-1.33 change to +1.33?

Michelle Yu 1L

I don't get why you multiply the 3 to the 2nd redox reaction (O2 +2H+ + 2e- = H2O)

Michelle Yu 1L

There was a similar problem where it was drawn like the this neopentyl but instead of neo it was named tert in final 2012 the first one of 6D. so I am confused between the two.

Michelle Yu 1L

for the 1-isopropyl -3- neopentylcyclohexane, how do you know it is neopentyl?

Michelle Yu 1L

whenever theres a double bond, you look to see if its a cis or trans
as you can see on the structure which is a cyclooctene, it is a cis because the CH2 are on the same side or whenever it looks like half a hexane.

Michelle Yu 1L

Between ethane and ethene, ethane has a higher heat capacity. Why?

Michelle Yu 1L

By looking at an free energy of activation vs activation energy graph, how can you tell if the forward reaction is favored or the reverse when you have a higher TS1 than TS2 and vise versa?

Michelle Yu 1L

functional group is not on the quiz

Michelle Yu 1L

Why is the rate determining step important?

Michelle Yu 1L

By look at k units, i believe it is second order reaction. So i used the second order equation, however, i don't have the time to figure out the concentration. Is there any way i can get the time or is there another equation to solve this.

Michelle Yu 1L

how did you arrive to

ml^1/2*g^-1/2*s^-1

Michelle Yu 1L

What would be the units of k for an overall order of 3/2 if the concentrations were expressed in grams per milliliter?
(Questions is in chemistry textbook pg 620)

Michelle Yu 1L

The more mass the more disorder. the molecules are able to switch to many different states. i believe.

Michelle Yu 1L

When it ask for cell potential, is it E or E^o?

Michelle Yu 1L

so the reactants always break bonds and products form bonds?

Michelle Yu 1L

I am still very confused on how do you know what bonds are being broken to what bonds are being formed.

Michelle Yu 1L

What does it mean when entropy is a state function?

Michelle Yu 1L

You can tell if an acid is strong if it has a lot of oxygen or high oxidation number, or weak bond strength between the two molecules. When you have a lot of oxygen, you can withdraw more electrons. An example of strong bond strength is HF. F is so electronegative that when it bonds with a proton, i...

Michelle Yu 1L

I'm confused of why when you add solid sodium acetate to an acetic acid solution, the concentration of H3O+ decreases and why when HCl is added to a benzoic acid solution, the percentage of benzoic acid that is deprotonanted decreases and why when solid NH4Cl is added to an ammonia solution, the con...

Michelle Yu 1L

The question tells us to find the pH with given 0.055 M AlCl3(aq).

In the solution book, the chemical equation is
Al(H2O)6 3+ (aq) + H2O = H3O+(aq) + Al(H2O)5 OH2+

why did Cl get replaced with H2O?

Michelle Yu 1L

This is from Quiz #3. Question #4.
I showed how to find the total pressure using PV=nRT
And then I showed how to find the equilibrium constant by find the partial pressure using mole fractions.

Michelle Yu 1L

If the chemical equation has (aq), you would convert everything to M.
If the chemical equation has liquid or solid, then it equals to 1.

Michelle Yu 1L

I'm not sure if it has resonance or not, but i know that the bigger the bond order, the more stable the molecule because there are more bonding than aniti bonding i think.

Michelle Yu 1L

Why can't NO3- have 2 double bonds of oxygen?

Michelle Yu 1L

I know that when BO=3, it means a triple bond.
However if I get BO=1.5, what kind of bond is that?

Michelle Yu 1L

2A + 1B --> 3C

If one mole of A is mixed with one mole of B which is the limiting reactant?

I'm confused on how the limiting reactant is A. How will you approach this problem? Do i do molar ratio, if so how?

Michelle Yu 1L

Im confused on how to draw the lewis structure since Be is a metal. I know that a Be attaches to CH3 but how do you draw it?

CHEMISTRY COMMUNITY

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