CHEMISTRY COMMUNITY

Shreya Ramineni 2L

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

Shreya Ramineni 2L

Elementary reactions are the steps within an overall reaction; the slowest one in a reaction mechanism provides the overall rate law!

Shreya Ramineni 2L

Unimolecular would be:
A--> P
Bimolecular could be:
A+A-->P
A+B-->P

Shreya Ramineni 2L

If you are given the concentration and time, use integrated rate law.

Shreya Ramineni 2L

There isn't a need to convert from ln to log, especially because when integrated, the first order reaction provides ln.

Shreya Ramineni 2L

This is true; rate is independent of concentration, as the differential rate law is rate=k ([A]^0=1).

Shreya Ramineni 2L

Q: What did the chemist say when he found two isotopes of helium?
A: HeHe

Shreya Ramineni 2L

E is intensive, so the amount does not affect its potential.

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The more negative in potential, the more likely the substance is to be oxidized/work as a reducing agent. Therefore it has more of a reducing power.

Shreya Ramineni 2L

If there is no solid metal state that works as the conducting electrode, you need a stable metal such as Pt to use.

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you change the lnQ to 2.303logQ, as they are equivalent, and plug that into the equation. The -log[H+] will be the pH.

Shreya Ramineni 2L

The phases are separated.

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The reducing agent/the component with reducing power is being oxidized and vice versa.

Shreya Ramineni 2L

Yes, it is used to balance out oxygens and the hydrogens in redox reactions.

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Yes, I'm pretty sure acidic or basic will be given.

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Intensive properties do not depend on quantity while extensive do. Intensive are preferred because they are more standardized.

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Isobaric means constant pressure.

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Yes, I think we assume ideal gases unless specified differently.

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How about the chemical workers… are they unionized?

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H2O is water and H2O2 is hydrogen peroxide. What is H2O4?
Drinking.

Shreya Ramineni 2L

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

Shreya Ramineni 2L

Q is the reaction quotient while K is the equilibrium constant. You use K at equilibrium or when delta G is equal to 0. You use Q when delta G is not equal to 0.

Shreya Ramineni 2L

Thermodynamically favorable means spontaneous, or that the reaction does not require energy in order to happen.

Shreya Ramineni 2L

Its based on system vs. surroundings and where the heat is transferring. Because heat goes from hot to cold, the 800 K part is losing and has a negative sign while the 200 K is gaining and has a positive sign.

Shreya Ramineni 2L

We just need to know that its for a monatomic ideal gas atom. The C=5/2 R is on the formula sheet if I remember correctly!

Shreya Ramineni 2L

An open system can transfer matter and/or energy. A closed system system can transfer energy not matter. An isolated system cannot transfer either.

Shreya Ramineni 2L

Ideal means no heat or matter transfer between system and surroundings, so the system is isolated.

Shreya Ramineni 2L

Why did the acid go to the gym?

To become a buffer solution!

Shreya Ramineni 2L

Heat Capacity is the amount of heat required to raise the temperature of an object by 1 deg C and is extensive. However, specific heat capacity is intensive and is the amount of heat required to raise the temperature of 1 gram of a substance by 1 deg C. Specific heat is preferred over heat capacity.

Shreya Ramineni 2L

Intensive properties do not depend on amount of the substance while extensive properties do. An example of an intensive property is density, while extensive include work and heat. For calculations, an extensive divided by an extensive gives an intensive property, which is seen with heat capacity and...

Shreya Ramineni 2L

Q is the reaction quotient and represents the ratio of products and reactants at any point within reaction. When compared to K it provides insight into how the reaction will go.

Shreya Ramineni 2L

Partial pressures are in atm.

Shreya Ramineni 2L

K=Kp which is for gases and partial pressures but Kc is for molarity.

Shreya Ramineni 2L

Due to what is given, one must find the molarity so you have to divide by the volume to get it.

Shreya Ramineni 2L

R is the ideal gas constant, and its value depends on the units of P, V, n, and T within the ideal gas law.

Shreya Ramineni 2L

Lone pairs take up more space that bonding pairs, which leads them to have greater repulsion.

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No, it doesn't affect the shape.

Shreya Ramineni 2L

Single bonds are sigma bonds. Double bonds are a sigma bond and a pi bond. Triple bonds are a sigma bond and 2 pi bonds.

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4s is lower in energy than 3d, so it gets filled up first.

Shreya Ramineni 2L

The number of e- density areas equal the hybridization. So for example, a molecule with 1 s and 1 p would have 2 hybridized orbitals and a hybridization of sp.

Shreya Ramineni 2L

No, it covers fundementals through chapter 3, so the latest thing covered is resonance/bonds.

Shreya Ramineni 2L

It's dependent on the structure, so it would help to visualize the structure and use it to approximate bond angles.

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The range for ml is -l to l, so its dependent on the subshell (l) of the element.

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the quantum spin number can haven either +/- 1/2.

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Trigonal pyramidal is three bonding pairs and one lone pair.

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For resonance, you draw all of the possible structures and connect them by showing resonance through double sided arrows (<---->).

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A formal charge of 0 is the most favorable because it is the most stable.

Shreya Ramineni 2L

Formal charge is found by the formula FC= V - (L+(s/2)) where v is the amount of valence electrons of the atom, L is the amount of lone pair electrons, and s/2 is the amount of bonds shared, which can be figured out by divided the electrons shared by 2.

Shreya Ramineni 2L

Balmer is when an electron jumps down to n=2 from a higher energy level and Lyman is when it jumps down to n=1.

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Velocity should always be in m/s with chemistry calculations.

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