CHEMISTRY COMMUNITY

Jesus Rodriguez 1J

Little Johnny had a drink
But now he'll drink no more
For what he thought was H2O was H2SO4

Jesus Rodriguez 1J

-What do you call a tooth in a glass of water? A one molar solution.

Jesus Rodriguez 1J

Can someone please explain where the solution manual got the -.59 from?

Jesus Rodriguez 1J

Question: What's a pirate's favorite element?

Answer: Gold (Bet you thought I was gonna say Arrrgon)

Jesus Rodriguez 1J

I told a joke to a guy named Helium, he didn't react.

Jesus Rodriguez 1J

Can someone explain how the solution manual got 1/A = 16/Ao?

Jesus Rodriguez 1J

Q: What is a cation afraid of?
A: A dogion.

Jesus Rodriguez 1J

What did the thermometer say to the graduated cylinder? "You may have graduated but I've got many degrees."

Jesus Rodriguez 1J

Would the answer to this problem be considered to be a second order because it relies on both of the concentrations or would it be a first order because both concentrations are first order?

Jesus Rodriguez 1J

Q: What element is a girl's future best friend?
A: Carbon.

Jesus Rodriguez 1J

How can we determine how strong of reducing agent metals are?

Jesus Rodriguez 1J

How do we know if the redox reaction is occuring in acidic or basic solution?

Jesus Rodriguez 1J

Old Chemists Never Die, They Just Reach Equilibrium

Jesus Rodriguez 1J

How do we know when to add H20 or H+ to the half reactions?
For example in 14.3 part a
They added 5H20 to the reactants and 10H+ to the products. I'm not sure where they got these numbers from.

Jesus Rodriguez 1J

I was wondering if someone could explain to how they solved for DeltaG2, I understand the setup of the problem but I'm not sure how they got rid of e in one of the very last steps.

Jesus Rodriguez 1J

Hi can someone please link the worksheet that we are suppose to printout for today's review session, I can't find it.

Jesus Rodriguez 1J

Since, Valentine's Day is coming up, here's a nice Chemistry Pick-Up Line

Are you made of copper and tellurium? Because you're CuTe.

Jesus Rodriguez 1J

Why does hamburger yield lower energy than steak? Because it's in the ground state.

Jesus Rodriguez 1J

Can someone explain when we would need to calculate both isothermal and isovolumetric calculations and add the two? like what should the question be stating in order for us to know that we would need to combine these two processes.

Jesus Rodriguez 1J

If you're not part of the solution, you're part of the precipitate!

Jesus Rodriguez 1J

Old chemists never die, they just stop reacting.

Jesus Rodriguez 1J

Could someone explain to me what a spontaneous reaction is and possibly use the picture that the professor drew last friday I believe (the picture was of something going up a hill, if I remember correctly)

Jesus Rodriguez 1J

Can someone explain to me why we had to multiply the gas constant by 5/2 and 3/2?

Jesus Rodriguez 1J

Q: Did you hear about the man who got cooled to absolute zero?

A: He's 0K now

Jesus Rodriguez 1J

In most part problems, the water is usually seen as the surrounding but it's like the person above said, it all depends on what the question is describing

Jesus Rodriguez 1J

For the most part, we are usually given anything that is needed to solve that problem whether directly or indirectly given to us.

Jesus Rodriguez 1J

A 248 g piece of copper is dropped into 390ml of water at 22.6C. The final temperature of the water is 39.9C. Can someone explain how we would calculate the initial temperature of the copper piece?

Jesus Rodriguez 1J

Can someone explain when to use .08206 value vs the 8.314 value

Jesus Rodriguez 1J

If the reaction we want is N2 + 5/2 O2 --> N205,
then why does the solution stop at 2NO + (3/2)O2 --> N205
I'm wondering about the unequal amount of oxygen

Jesus Rodriguez 1J

Can someone explain to me how to find the enthalpies of formation for the products, the solutions manual shows -393.51kj/mol for CO2 but I'm unsure as to how they got that number

Jesus Rodriguez 1J

Steam burns more because it is undergoing a phase change as a result of reacting with your skin and the phase change from vapor to liquid causes heat to be released

I found this link to be helpful

http://scienceline.ucsb.edu/getkey.php?key=1322

Jesus Rodriguez 1J

I would never try to poison you...

Now eat your Pb and Jelly sandwich

Jesus Rodriguez 1J

Don't tell jokes to noble gases

You'll get no reaction

Jesus Rodriguez 1J

In an endothermic reaction the system absorbs energy(delta H>0), where as in exothermic reactions heat is released(delta H<0). If you click on this link http://antoine.frostburg.edu/chem/senese/101/thermo/faq/exothermic-endothermic-examples.shtml , it will take you several examples of each type of r...

Jesus Rodriguez 1J

Can someone tell me where the LaKretz Building is located so that I know where to go for the review sessions today and final tomorrow

Jesus Rodriguez 1J

pH represents the concentration of H+ while pOH is a measure of concentration of OH-. You would calculate the value by taking the -log of concentration of the substance.

Jesus Rodriguez 1J

Yes, every first bond is a sigma bond and the rest of the bond that follow(like the 2nd bond in a double bond) are pi bonds.

Jesus Rodriguez 1J

The first bonds are known as sigma bonds and the rest of the bonds are pi bonds. For example, when there is a triple bond, the first is a sigma bond and the 2nd and 3rd bonds are pi bonds.

Jesus Rodriguez 1J

I was wondering if anyone could explain how we know if a compound has the seesaw molecular shape

Jesus Rodriguez 1J

There would not be negative roman numerals because you would only use the roman numerals to describe the different oxidation state of that transition metal.

Jesus Rodriguez 1J

A chelate is a complex that contains one more ligands that form a ring of atoms with the central metal atom.

Jesus Rodriguez 1J

No you would not use DeBroglie Equation to find the energy of a photon because the equation gives you the wavelength for particles of mass. To find the Energy of A photon you would the equation E=hv, you can derive v from the formula c = lambda * frequency (v)

Jesus Rodriguez 1J

If you are given the percentages of each element. You can just use percentages as grams because the empirical formula is relative to the number of atoms. You would then divide the number of grams by the molar mass of each element to get moles. Then divide by lowest number of moles that you got and u...

Jesus Rodriguez 1J

The d block is written before the s block because the d block is lower in energy. Since electron configurations are written based on increasing energy d would always come before s.

Jesus Rodriguez 1J

Lone pair refers to valence e- that aren't shared with another atom. Biradical refers two unpaired electrons

Jesus Rodriguez 1J

Calculating the formal charge of the each element and you add them up to determine how stable a molecule is.

Jesus Rodriguez 1J

Yes, 300. has 3 sig figs because of the decimal which makes the zeros significant. Whereas the zeros in 300 are just seen as placeholders.

Jesus Rodriguez 1J

No we would not be expected to know the specific color. You would however be expected to know the range of the spectrum of colors (red-700nm and 400nm)

Jesus Rodriguez 1J

The angular momentum quantum number describes the shape the orbital where an electron is found. As for calculations. The L helps us calculate orbital angular momentum which is the rate that the electron moves around the nucleus. That formula is (l(l+1))^1/2*(h/2pi)

Jesus Rodriguez 1J

I was wondering if it was possible for the energy levels to move down and if or how that would affect the Formula En= -hR/n^2

Jesus Rodriguez 1J

Photons are small particles of light that are said be massless and have both wavelike properties which is shown in the diffraction experiment and also contains particle properties which can seen in the photoelectric experiment.

Jesus Rodriguez 1J

Your next step would be to convert the grams of reactant into moles. You would do this by dividing the grams given to you by the molar mass of the reactant. From then you would need to divided the number moles by the coefficient in front of the particular reactant. Then whichever reactant has the le...

Jesus Rodriguez 1J

The standard units for molarity are mol/L so I would suggest using those units. If a problem for some reason asks you for Molarity in terms of mol/ml you can always convert the Liters.

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