CHEMISTRY COMMUNITY

VictoriaRoderick_3A

Dr. Lavelle said that anything between the reactant and product is considered an intermediate. That is how I approach it.

VictoriaRoderick_3A

Take the page and turn it slightly to the right. From the carbon-carbon double bond, there a C and H on the same side. The C has higher priority than H, making is trans- or E-.

VictoriaRoderick_3A

I believe so. The different endings are only because of the functional groups for each molecule, and the numbers in the middle of the parent chain represent the location of single/double bonds.

VictoriaRoderick_3A

Start with the parent chain and then focus on the number of bonds, functional groups, and substituents.

Remember to keep the numbers as low as possible!

VictoriaRoderick_3A

Torsional strain is developed from the electron activity surrounding each atom. When the molecule is eclipsed, the electrons are being forced together, and they naturally repel. Steric strain is developed from physical interactions. This is when the actual atoms are hitting each other due to the clo...

VictoriaRoderick_3A

Once the equation is written out, they should cancel out. I believe there is an example in the course reader.

VictoriaRoderick_3A

When a catalyst is present, there is a lower activation energy because the reaction is sped up.

VictoriaRoderick_3A

For sec- the center carbon should be attached to two other carbons as well.

VictoriaRoderick_3A

When you write out the division problem, the A's should cancel out.

VictoriaRoderick_3A

As long the molecule is symmetrical, you can attach it to the either carbon. The halogen then attaches to the carbocation.

VictoriaRoderick_3A

Nucleophiles meet these standards:
1) Negative Charge
2) Double Bonds (such as the hydrocarbon mentioned)
3) Extra lone pairs

VictoriaRoderick_3A

The line has to be even with the reactants because is the reference point. Think of it as sea level. Anything higher has a positive change, and anything below has a negative change.

VictoriaRoderick_3A

Correction:

2nd Order is 1/[conc]

VictoriaRoderick_3A

That depends on the order.

You use ln[conc] for first order.

You use 1/ln[conc] for second order

You use [conc] for zero order.

VictoriaRoderick_3A

I was under the impression that they were necessary. I have not seen an example that does not include one. The salt does not affect the reaction, and it prevents electron build up (as mentioned above).

VictoriaRoderick_3A

These are how you calculate the heat capacity of ideal gases.

You use the 3/2R equation for monatomic gases.

You use the 5/2R equation for diatomic gases.

VictoriaRoderick_3A

I believe it is because H₂ is the natural state of Hydrogen, while Br₂ is not the natural state of Bromine.

VictoriaRoderick_3A

How do you know how many electrons to add?

VictoriaRoderick_3A

How do you calculate the max potential of cells? Why is the concept important?

VictoriaRoderick_3A

I believe this is the case simply because you are given the values to solve for n.

VictoriaRoderick_3A

The change of internal energy does not depend on how the system got to the initial or final state.

VictoriaRoderick_3A

I was just wondering if there were different equations for when the pressure is constant and volume is constant. Or do you use the same equation?

Thank You.

VictoriaRoderick_3A

The molar heat capacity higher when the molecule is more complicated. The more bonds a molecule has the more vibrational movements and rotation movements the molecule has. This means that it requires more energy to be raised one degree celsius since the energy is being used in multiple bonds.

VictoriaRoderick_3A

My question is in regards to the chapter 8 homework question 61.

When cancelling the out various components to the reactions, can you cancel any products from any reactants or does it have to be the continuing reaction.

For 61, can I cancel the 2NH₄Br in the first and last equation?

Thank you.

VictoriaRoderick_3A

How can you tell whether an acid is a Lewis or Bronsted acid? Does it have anything to do with whether the acid is a product or reactant?

I'm really confused on determining this.

Thank you,
Victoria

VictoriaRoderick_3A

I am pretty sure this is for the second quiz in our green book.

VictoriaRoderick_3A

Hope this helps.

VictoriaRoderick_3A

How do you determine the coordination number of a central metal ion?

VictoriaRoderick_3A

This is the question... Consider the following reaction: NH_{4}HS (s)\rightarrow NH_{3} (g) + H_{2}S (g) If the value of Kp os 0.11 atm^{2} at 300 K, calculate the equilibrium partial pressure of NH_{3} (g) starting from pure NH_{4}HS (s) . I don't know how to approac...

VictoriaRoderick_3A

HN(CH_{2}CH_{2}NH{2})_{2} would be polydentate, more specifically tridentate. Each of the three nitrogens has a lone pair, so those can be replaced by a bond. CO_{3} 2- can be either mono- or polydentate; however, it is more often monodentate. Remember that the molecular shape is trigonal p...

VictoriaRoderick_3A

A chelate is a complex containing a ligand that forms a ring of atoms that includes the central metal atom. This is directly from the course reader on page 104.

A chelate is a closed loop, so it must have at least two ligating atoms.

VictoriaRoderick_3A

I would draw them all just to avoid any confusion. Also, it would be easier for the graders to find partial points to give you.

I did hear that if it ask for all four, you are REQUIRED to do all four.

VictoriaRoderick_3A

It takes more energy for them pair in a sigma bond than a pi bond, in this case.

VictoriaRoderick_3A

After I did the Lewis Structure, I got $2sp_{2}$ , but the answer was just $sp_{2}$ ? Why is this? Should their be a 2 because it is in period 2?

VictoriaRoderick_3A

For question 4.1 there is a linear molecule with an angle of 180 degrees. There question asks if there must be, may be, or cannot be one or more lone pairs of electrons on the central atom. I thought the answer would be there cannot be because it is linear, but the solutions manual said their may be...

VictoriaRoderick_3A

Does it matter where you put the dots for the elements while doing a Lewis Structure? Between the two Lewis Structures attached, which one would be right?

: Example; WIN_20151016_15_38_22_Pro.jpg (32.37 KiB) Viewed 1438 times

VictoriaRoderick_3A

I am confused on what number means what during an electronic configuration. So, the first number is the energy level and the row number ( and d is one behind)? The letter tells what orbital the electron is in? The number tells how many electrons are in the orbitals and whether they are paired or par...

VictoriaRoderick_3A

I am confused on what number means what during an electronic configuration. So, the first number is the energy level and the row number ( and d is one behind)? The letter tells what orbital the electron is in? The number tells how many electrons are in the orbitals and whether they are paired or par...

VictoriaRoderick_3A

During the lecture on 10/5 Professor Lavelle talked about how to you can tell what shape the orbital of an element is based on the periodic table, and I was confused about how this was done exactly. When he described them as blocks, where do they begin and end?

: Lavelle's Periodic Table

VictoriaRoderick_3A

SigFigs are so simple they get confusing, I am just going to stick with the right amount, and if I am skeptical just go with less. My TA said that you can't add precision, but you can make it less precise.

VictoriaRoderick_3A

I am pretty sure is saying that although a new electron can be emitted, the same one can continue to be emitted, and each time it is emitted it loses more energy.

VictoriaRoderick_3A

For chapter 1 question 57, why is it (1/2^2) - 1(7^2) in the Rydberg equation? Since the two is the first number in the Balmer Series, does the sequence start at 2? The question is trying to solve for the fifth line in the sequence, so would it go N1=2 and then N2=3,4,5,6,7 with 7 being the fifth nu...

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