CHEMISTRY COMMUNITY

Warda Sahib 2J

They're the same, you can use either

Warda Sahib 2J

Specific heat capacity uses grams while Molar heat capacity uses moles

Warda Sahib 2J

The units are in KJ/mol but KJ alone should also be ok

Warda Sahib 2J

R is the ideal gas constant.

Warda Sahib 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."

Warda Sahib 2J

Have you heard the one about a chemist who was reading a book about helium?
He just couldn't put it down.

Warda Sahib 2J

How often does a chemist like to hear jokes? Periodically.

Warda Sahib 2J

Electron configuration? How BOHRing.

Warda Sahib 2J

Have you heard about Agent 007 going to Antarctica? It was a polar Bond.

Warda Sahib 2J

Yes, it is

Warda Sahib 2J

I don't think you will have to answer a question using that equation, but like the answer above states, it's helpful to see the relationship between U and T (the only nonconstants in the equation).

Warda Sahib 2J

The reversible expansion does not have constant pressure, while the irreversible one does.

Warda Sahib 2J

I don't think so, I think there were only be system/surroundings stuff that relate to the environment.

Warda Sahib 2J

Cv-is when there's constant volume and Cp-is when there's constant pressure.

Warda Sahib 2J

Enthalpy of Sublimation (solid to gas) is the sum of enthalpy of fusion and enthalpy of vaporization

Warda Sahib 2J

Does anyone know if we have to memorize all of the equations that are not on the Constants and Equations sheet?

Warda Sahib 2J

No, I am assuming Professor Lavelle is proving those

Warda Sahib 2J

ΔHc-enthalpy of combustion; ΔHL-lattice enthalpy; ΔHb is bond enthalpy.

Warda Sahib 2J

Because no energy or matter can be transferred

Warda Sahib 2J

Entropy is a measure of disorder or randomness of a system. Enthalpy is defined as the sum of internal energy of a system and the product of the pressure and volume of the system.

Warda Sahib 2J

No, the work doesn't necessarily have to be negative in this case.

Warda Sahib 2J

Because energy is transferred in closed systems, adding or subtracting heat will affect the energy.

Warda Sahib 2J

You can use either because adding 273 won't make a difference.

Warda Sahib 2J

I took chem 14a last quarter and I never took AP Chem in high school. Watching youtube videos on concepts I didn't understand really helped me.

Warda Sahib 2J

Yes, you will need to know these three techniques: Hess's law, Bond Enthalpies, Standard enthalpies of formation. The only one you don't have to worry about for the test is isothermal.

Warda Sahib 2J

Does Dr. Lavelle only test on things he's talked about?

Warda Sahib 2J

What does Hess's law allow you to do?

Warda Sahib 2J

Given a forward reaction with positive enthalpy, will its reverse reaction be endothermic or exothermic?

Warda Sahib 2J

reactant: A substance participating in a chemical reaction, especially a directly reacting substance present at the initiation of the reaction.
reagent: A substance used in a chemical reaction to detect, measure, examine, or produce other substances.

CHEMISTRY COMMUNITY

Search found 29 matches

Re: Cell Potential

Re: mass in q = m(c) delta t

Re: Units

Re: What does R stand for?

Re: Post All Chemistry Jokes Here

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Re: Is enthalpy a state function?

Re: U = 3/2 nRT

Re: Reversible

Re: Environmental impact?

Re: Cv vs. Cp [ENDORSED]

Re: Sublimation

Equations

Re: Heat capacity [ENDORSED]

Re: Different Changes in Enthalpy symbols -ΔH

Re: The universe

Re: Enthalpy vs. Entropy

Re: Heat and Work relation

Re: Closed Systems [ENDORSED]

Re: Question 8.31

Re: Rusty on High School Chem [ENDORSED]

Re: Hesss Law

Re: Week 3 Test Topic is endorsed

Hess's Law

Enthalpy

Re: Reactant vs. Reagent [ENDORSED]