CHEMISTRY COMMUNITY

Isa Samad 1L

I have in my notes from lecture that enzymes and catalysts are zero order with regards to mechanisms. Why is this? Don't enzymes/catalysts make the rate faster by creating a pathway of lower activation energy and thereby, affect the rate of a reaction?

Isa Samad 1L

Q: What did the bartender say when oxygen, hydrogen, sulfur, sodium, and phosphorous walked into his bar?
A: OH SNaP!

Isa Samad 1L

I was wondering what exactly the conditions for being an amine group is. Aside from being a nitrogen with a lone pair in a carbon chain, are there any specific conditions like how a ketone must be a double bonded Oxygen bonded to two carbons?

Isa Samad 1L

Q: What do you call a wheel made of iron?
A: A ferrous wheel.

Isa Samad 1L

Q: What kind of fish is made out of 2 sodium atoms?
A: 2 Na

Isa Samad 1L

I was wondering how we would calculate the potential of a reaction that has only reduction or only oxidation? For example, the reaction
Cr2O7(2-) + 14H+ + 12e- --> 2Cr(s) + 7H2O is the sum of the two half reactions:
1. Cr2O7(2-) + 14H+ + 6e- ----> 2Cr(3+) + 7H2O
2. 2Cr(3+) + 6e- ---> 2Cr(s)

Isa Samad 1L

Old chemists never die, they just stop reacting.

Isa Samad 1L

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

Isa Samad 1L

Making bad chemistry jokes because all the good ones Argon

Isa Samad 1L

Q: What is the show cesium and iodine love watching together?
A: CSI

Isa Samad 1L

Did you know that you can cool yourself to -273.15˚C and still be 0k?

Isa Samad 1L

Was wondering if hydroxide can ever participate in the exchange of electrons (oxidation/reduction) or if its only purpose is to keep charge balanced on both sides?

Isa Samad 1L

Silver walks up to Gold in a bar and says, "AU, get outta here!"

Isa Samad 1L

Q: Anyone know any jokes about sodium?
A: Na

Isa Samad 1L

I remember in lecture that Dr. Lavelle mentioned that Gibb's Free Energy should really be called Gibb's available energy since when ∆G < 0, Gibb's free energy can be thought of as the maximum energy that a system can use to do work. I'm guessing that since Dr. Lavelle specified this definition under...

Isa Samad 1L

I asked the guy sitting next to me if he had any Sodium Hypobromite…
He said NaBrO

Isa Samad 1L

Don't trust atoms, they make up everything.

Isa Samad 1L

Q: What do you do if you can't helium or curium?

A: You BARIUM!

Isa Samad 1L

If the Silver Surfer and Iron Man team up, they’d be alloys.

Isa Samad 1L

Q: What is the chemical formula for "banana"?
A: BaNa2

Isa Samad 1L

Was going through some of the homework question and was confused by the various formulas for work and when you can use them. For example, when should I use w=-P∆V vs w=-nRTln((V2/V1))? Also, are we only supposed to use Cv and Cp for ∆S calculations when temperature is changing? Can we use these spec...

Isa Samad 1L

Why do chemists like nitrates so much?
They're cheaper than day rates.

Isa Samad 1L

How about the chemical workers… are they unionized?

Isa Samad 1L

Did you know that you can cool yourself to -273.15˚C and still be 0k?

Isa Samad 1L

What do you call an acid with an attitude?

A: A-mean-oh acid

Isa Samad 1L

Was wondering if these two calorimeters are considered an isolated system and closed system respectively or is it the other way around?

Isa Samad 1L

I'm a little confused on when to use units of kJ/mol in the answer. I know that if the question is asking for standard enthalpy of formation that you must provide the answer in kJ/mol, but when else would we use these units?

Isa Samad 1L

In the solutions manual, the answer uses the equation -q(water) = q(ice). Is this because the ice is lowering the temperature of the water?

Isa Samad 1L

I was just wondering if there are any significant differences in the two calorimeters and whether or not calculations with them involve different equations.

Thanks

Isa Samad 1L

For question 8.7, how does one differentiate work being done on a system vs. work being done by a system? Also, how does one calculate work once this distinction has been made?

Isa Samad 1L

In the textbook, 11.115 is a similar question which asks what will happen to the photosynthesis reaction when water is added. However in the solutions manual, it says that the reaction is unaffected since water is a pure liquid with unit concentration and the concentration of glucose will remain dil...

Isa Samad 1L

When drawing out the lewis structure of CBr2Cl2, I drew as tetrahedral and completed an octet for the chlorine and bromine atoms. However this molecule is polar since that the dipoles don't cancel. Why is this? Why won't the dipoles cancel?

Isa Samad 1L

For writing out the formulas of compounds, would we be required to write out the entire chemical formula for EDTA or is (edta) and its associated prefix enough to provide? Also, I read that Thiocyanato is an ambidentate ligand, as it can attach at either the sulfur or nitrogen atom. Does this mean t...

Isa Samad 1L

Doest the hybridization of a pi bond also ultilize an un-used p orbital? For example, would the pi bond in CN- have a composition of
π(C 2p, N 2p)?

Isa Samad 1L

When writing the hydrolysis equation for homework question 12.65 f, how could we determine that there are 6 water molecules liganded to the central Copper (II) ion? Is this just something we have to memorize for the common TM ions or is there an intuitive way to determine it?

Isa Samad 1L

For 12.81, the question states to calculate the pH of a diprotic acid solution of H2CO3, ignoring the second deprotonation. In what scenario would we not be allowed to use this approximation and calculate the total [H3O+] for the more accurate pH after both deprotonations?

Isa Samad 1L

How would you calculate the pH of a amphiprotic species, as it has the ability to both accept and donate hydrogen protons? For example, how could you calculate the pH of 0.010 M NaHCO3. I understand that the sodium ion would be a spectator and thus, the HCO3 ion would contribute to the pH of the sys...

Isa Samad 1L

Take an equilibria such as BF3(g) + 3H2O(l) ⇌ 3HF (aq) + H3BO3 (aq) In this example, in order to calculate the equilibrium constant, we need the same units for all compounds (ie: molarity/atmospheres). But in this example, would we specifically be calculating Kc or Kp? Or would it not matter provide...

Isa Samad 1L

LCP, aka Le Chatelier's principle, is basically the idea that if a stress is applied to a system in equilibrium, the system will try to reverse said stress. For example, take the reaction SO2(g)+O2(g)⇌SO3(g), if the concentration of SO2 was increased, the system would try to remove the added SO2 by ...

Isa Samad 1L

While I was doing homework problems, I noticed that XeF4 had the molecular geometry of square planar but was considered non-polar since its lone pairs are opposite of one another and thus, cancel each other out, resulting in a overall non-polar molecule. Are there any other examples of VSEPR structu...

Isa Samad 1L

Is the coordination number basically the number of ligands attached to a central TM atom? Does a ligand being polydentate factor into the coordination number of the complex?

Isa Samad 1L

So basically a chelating complex is one that forms a ring around a central transition metal. Therefore, the positions of the ligands matter as the coordination covalent bond formed must be in a ring orientation.

Isa Samad 1L

I don't trust atoms....they make up everything

Isa Samad 1L

Q: What do you do if you can't helium?

A: You BARIUM!

Isa Samad 1L

Q: What do you call a tooth in a glass of water?

A: A one molar solution

Isa Samad 1L

Q: What do you do with a dead chemist?

A: You BARIUM!

Isa Samad 1L

Hi there,

I was doing the homework question 2.17 which asks,
How many orbitals are in the subshells with l = to 3

I know that when l = 3, n=4 but wouldn't n=4 have 8 orbitals as there are the 1s,2s,2p,3s,3p,3d,4s,4p orbitals? The solutions manual says there are 7.

Thanks

Isa Samad 1L

Adding on to the previous point, orbitals are basically probability distributions since we know that it is impossible to find out an electron's exact position at any given time. A nodal plane is simply put, an area in which there aren't any electrons. In other words, it is where the graph of the orb...

Isa Samad 1L

What kind of dogs do chemists have?

A: Laboratory Retrievers

Isa Samad 1L

So as I understand, the Balmer series is a particular Hydrogen spectral series when an electron moves from a higher energy level to n=2. My question then is after reaching the energy level of n=2, would the electron then travel down to n=1 as that is ground state and thus, emit another form of EM ra...

Isa Samad 1L

I don't trust atoms...

I hear they make up everything

Isa Samad 1L

Dolomite is a mixed carbonate of calcium and magnesium. Calcium and Magnesium carbonates both decompose upon heating to produce the metal oxides (MgO and CaO) and Carbon dioxide. If 4.84g of residue consisting of MgO and CaO remains when 9.66g of dolomite is heated until decomposition is complete, w...

Isa Samad 1L

What do you do if you can't helium or curium?

You BARIUM!

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