CHEMISTRY COMMUNITY

Miguel Velasco 2J

Miguel Velasco 2J

Q. Is silicon spelled the same in Spanish?
A. Si!

Miguel Velasco 2J

Did you know you could cool yourself to -273 degrees celsius and still be 0k?

Miguel Velasco 2J

Miguel Velasco 2J

A photon checks into a hotel and is asked if he needs any help with his luggage. He says, "No, I'm traveling light."

Miguel Velasco 2J

Two chemists go into a bar. The first one says "I think I'll have an H2O." The second one says "I think I'll have an H2O too" — and he died.

Miguel Velasco 2J

In regards to gibbs free engery of activation, it will always be positive as energy is usually taken up for the reaction to happen.

Miguel Velasco 2J

You always calculate based on what you got for the slowest step. The slowest step therefore is your determining rate.

Miguel Velasco 2J

CO2 is zero order and is needed

Miguel Velasco 2J

Delta H of formation for diamond is higher in energy than it is for graphite and happens at a much slower rate.

Miguel Velasco 2J

When calculating Q for a reaction consisting of gases, Molarity and partial pressures are used.

Miguel Velasco 2J

The rate should always be positive, hence the need for the negative sign.

Miguel Velasco 2J

Exactly, charges within a compound have oxidation numbers that contribute to the overall state of the compound.

Miguel Velasco 2J

In a nonspontaneous reaction, an electron current is necessary for a redox reaction to occur.

Miguel Velasco 2J

Your reaction is the system, leaving the beaker and the atmosphere as your surroundings.

Miguel Velasco 2J

we know the micro state is w=1 because there exists no movement at 0 Kelvin therefore resulting in entropy equal to 0.

Miguel Velasco 2J

Stick to the amount you are using in your equations and see if your answer matches the ones in the textbook.

Miguel Velasco 2J

Same thinking here. Biological systems are at equilibrium and our systems are assumed to be so.

Miguel Velasco 2J

Examples of Radiation are: Heat from the sun or feeling heat from a fire. A convection example could be boiling water: heat passes from the flame into a pot which heats the water at the bottom, then the hot water rises and cooler water moves down, resulting in a circular motion.

Miguel Velasco 2J

Work cant be done in an isolated system. There is no energy transfer from the system and the surroundings so assume both work and heat exchange are zero.

Miguel Velasco 2J

Exactly. Since 02 and H20 were the results of your reaction, they are the products.

Miguel Velasco 2J

why does gas have two values for molar heat capacity?

Miguel Velasco 2J

Dr. Lavelle also mentioned there is a device that can be used to keep the substance at a certain temperature

Miguel Velasco 2J

Do we always assume an element is in its standard state (surroundings being 25 degrees C and 1atm)?

Miguel Velasco 2J

I remember he initially had C2sp and then erased the 2

Miguel Velasco 2J

Yes I heard that too. But I remember him saying something about omitting it if the question doesn't ask for it. Can someone clarify this part?

Miguel Velasco 2J

Remember we omit liquids from the equation

Miguel Velasco 2J

Makes sense thank you!

Miguel Velasco 2J

what is the difference between when a reaction is said to "Lie to the right " vs when the “equilibrium is shifted to the right” vs with respect to equilibrium constants?

Miguel Velasco 2J

Know its less than (>109.5) and why (possible lone pairs)

Miguel Velasco 2J

Each slightly increase.

Miguel Velasco 2J

Yes. 1s, 2s,2p,3s,3p...

Miguel Velasco 2J

Are the only elements that adhere to the octet rule those with an energy level of 3 and below? Essentially those without access to the d orbital?

Miguel Velasco 2J

For Ni3+, why is the electron configuration [Ar]3d7 as opposed to [Ar]4s^2 3d5

Miguel Velasco 2J

Check your email in the future. Dr. Lavelle this week sent one Monday stating "For the assigned homework it is Chapter 1 questions 3-41." if you are ever confused.

Miguel Velasco 2J

Always depends on where it started and ended up. Remember, E(final) - E(initial)

Miguel Velasco 2J

I understand you use Avogadro's constant to solve part b, but isn't the constant usually used to find atoms per mol? not photons per mol?

Miguel Velasco 2J

also, some problems start in (for example) milligrams or picometers. make sure you convert them to grams/meters before you begin.

Miguel Velasco 2J

Use Avogadro's number to turn grams to atoms!

Miguel Velasco 2J

Remember! In E=hv, E is energy PER photon. We have 4.7x10^-19J.photon^-1.
We then multiply 64J (1mole/6.022x10^23J) and get 1.4x10^20 photons (and jewels canceled out).

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