CHEMISTRY COMMUNITY

Juan Torres Dis 2D

According to the problem, the Helium gas is heated up in the non-expandable case up to 100 degrees before it is allowed to leak out. Since the case is non-expandable, the volume is constant and you thus use Cv instead of Cp. During the heating process, since the volume is constant, the pressure is g...

Juan Torres Dis 2D

I also noticed this mistake and do believe the textbook has a mistake. The functional group should get the lowest number, so I think it should get the 2.

Juan Torres Dis 2D

According to IUPAC, the number of the substituent goes first in order to have the lowest numbering for them. If we alphabetized first, we might not get the lowest possible number combinations. So yes, we always number substituents first.

Juan Torres Dis 2D

When one physicist asks another, "What's new?" The physicist says?

C over lambda.

Juan Torres Dis 2D

The rate constant K represents the change in molarity over a given period of time for a particular reaction. For example, mols/(L x seconds) are common units for a rate constant The n represents the exponent of a given substance in a reactant which its concentration term in the reaction rate is rais...

Juan Torres Dis 2D

When given a redox reaction, how can someone determine whether or not the K value is greater than one? If the K value is greater than one, is the going to go forward?

Juan Torres Dis 2D

In terms of multiple salt and voltaic bridges, I don't believe there would ever be a case in which you would need more than one. I believe adding another set of bridges would split the current being sent through them by half. If you have a solution with two or more anodes or cathodes, if they aren't...

Juan Torres Dis 2D

Gibb's free energy is equal to the maximum useful work which can be accomplished by the reaction. Therefore, if a reaction has a negative delta G, it means that work was done by the system as opposed to the surroundings, making the reaction favorable and thus will occur spontaneously. A reaction tha...

Juan Torres Dis 2D

Since the path taken to reach the final state does not affect the property, the state function is independent of the path function. Therefore, if we are only concerned with state functions, they can be added and subtracted because we're only working with the one given state of the enthalpies.

Juan Torres Dis 2D

If the reaction is not occurring in a standard state, then the given experimental values for the enthalpies of the reaction will not be true for that reaction. The temperature and pressure effect the amount of energy released or absorbed.

Juan Torres Dis 2D

Sorry, Just now posting in .wmv format. I could not figure out how to change the format.

Juan Torres Dis 2D

HW Question 12.50- How would you determine which is a stronger acid, HCN or NH4+? Would the fact that NH4+ is a positive ion make it easier to remove the protons due to repulsion from the nucleus?

Juan Torres Dis 2D

When making the ICE table, does the change in equilibrium become (.54 + 2x) due to the initial balanced equation. Also, how would one go about solving for the new equilibrium pressure?

Juan Torres Dis 2D

In a heterogenous molecule with one atom of Nuclear charge of Z>8 and another atom of Z<8, which Molecular orbital combination is used? The one for Z<8 or Z>8?

Juan Torres Dis 2D

Question 4.19 asks for the bond angles between the atoms in BH2-. There be a lone electron pair on the Boron atom and how would that affect the bond angles?

Juan Torres Dis 2D

I know that when there is an unpaired set of electrons, the bonded pairs get pushed away due to the electrostatic repulsion. In a molecule with a square planar VSEPR Structure, will the angles between the remaining 4 bonded atoms remain 90 degrees , or will the repulsion push them closer together?

Juan Torres Dis 2D

Hi Marvin, I'm pretty sure that there are no orbitals beyond the f-orbitals. The positive nuclear charge of the nucleus is shielded by too many core electrons to keep the valence electrons from leaving. The effective nuclear charge is also a lot less, therefore the attraction between the valence ele...

CHEMISTRY COMMUNITY

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Re: Winter Final 2012 2C

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K value

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Stronger Acid

Re: 2013 Quiz 3 Preparation #10

Molecular Orbital Between Heterogenous Molecules

Bond Angles for BH3-

Square Planar Angles

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