CHEMISTRY COMMUNITY

Daisylookinland

In order to get a straight line plot for a second order rxn you must use the integrated rate law and plot 1/[A] vs. time. The slope will be a positive K value

Daisylookinland

The graph of a zero order reaction will be [A] vs. time and will have a slope of -K

Daisylookinland

Do you include intermediates in the rate laws for elementary steps in reaction mechanisms?

Daisylookinland

Will the answers be posted after your review session? Thank you for your help!

Daisylookinland

Are there any phases of reactants that we exclude when writing rate laws? When we write K, for example, we exclude solids. Does this apply for rate laws as well?

Daisylookinland

for my K2 value I got 2.78*10^-14

On my test I took the negative log of this value but got the answer wrong, is that the wrong approach?

Daisylookinland

Will the Nernst equation be on our equation sheet?

Daisylookinland

Are these questions taken from past final exams?

Daisylookinland

Can someone explain the difference in calculating concentrations for a strong acid or base vs. calculating concentration for a weak acid or base?

Daisylookinland

How do you determine solubility from the equilibrium constant?

Daisylookinland

In the outline Dr. Lavelle posted, he says we need to be able to identify reactions where the ideal gas law can be used as an approximation.
What exactly does this mean?

Daisylookinland

I'm stuck on the same problem, I think it might have to do with adding the two half reactions together at the end and having the final equation be balanced, but I'm not sure. If someone could explain this that would be great!

Daisylookinland

In the homework problem 6L5 part b in the 7th edition, one of the cell diagrams is Pt(s)|I^-(aq)|I2(s)||Ce^4+(aq), Ce^3+(aq)|Pt(s)

I don't really understand why the Pt is included here, can someone explain?

Daisylookinland

Can someone explain what a reversible process is?

Daisylookinland

What exactly is an ideal gas?

Daisylookinland

This question, you have to use the formulas: qp=nCpDeltaT and qv=nCvDeltaT, but in the solution book they substitute Cp for (5/2R) and Cv for (3/2R). Can someone explain these substitutions?

Daisylookinland

If I understand correctly, I believe that heat capacity is sort of a sub-category of enthalpy. Enthalpy is the study of heat released or absorbed in chemical reactions and physical changes, where heat capacity is simply the amount of heat required to raise the temperature of an object by 1 degree C.

Daisylookinland

kilojoules

Daisylookinland

Enthalpy is a state property because the value of enthalpy is determined by its current state, not on the pathway taken to obtain that value. To use Dr. Lavelle's example from class, if someone went on a hike, the distance they travelled would not be a state property, however, their altitude change ...

Daisylookinland

deltaH^0 refers to the standard reaction enthalpy (the rxn enthalpy when all R and P are in their standard state). DeltaH is the general symbol for the amount of heat absorbed or released. There is also deltaHf^0 which refers to the Standard Enthalpy of Formation (the standard rxn enthalpy for the f...

Daisylookinland

In Method 1, why is it necessary to add the rxns to get the net rxn? Why would you not simply just add together the two deltaHs?

Daisylookinland

Why is it that the standard enthalpy formation of an element in its most standard form is zero?

Daisylookinland

In the notes, Dr. Lavelle wrote "for a pure liquid or solid it [the standard rxn enthalpy] is the pure L or S"
Can someone explain what this means?

Daisylookinland

If q=deltaH, then why is it that enthalpy is a state property but heat is pathway dependent?

Daisylookinland

Is there a difference between the enthalpy of a reaction and the energy required for the same reaction to take place?

Daisylookinland

Can anyone explain the reasoning behind the textbook problem 5J. 5 (7th edition)? I understand why in part d there would be no change, but for a,b,c, and e I'm confused as to how you would know reactants would be favored with an overall increase in pressure.

Daisylookinland

Just for clarification, a ligand must be able to donate electrons in order to form a coordinate covalent bond with the central atom, correct?

Daisylookinland

Dr. Lavelle mentioned in class that knowing the ligand names is useful, and that we should go to the textbook for common ligand names--however, I'm not sure if this is a requirement for the final.

Daisylookinland

How are you able to tell if a molecule is a chelating molecule?

Daisylookinland

If we are only given the formula for a molecule, how are we supposed to distinguish whether it is a cis or trans molecule?

Daisylookinland

Ruiting Jia 4D wrote:
Becky Belisle 1F wrote:I think it's useful to memorize the oxidation states of the common ligands.

Which are the common ligands that we would need to memorize for?

Is there a certain place in the textbook that is good for studying this?

Daisylookinland

If you have, for example, SO2, SO3, and SO3^2-, each molecule has a lewis structure with single bonds and one double bond.
If all of them have resonance, how would you determine which bond lengths are longer/shorter in comparison to one another? Are they all the same length?

Daisylookinland

In Dr. Lavelle's lecture notes for interactions between ions and molecules, he wrote:
1. Ion-Ion : Na+Cl- -250 kJ/mol

What does the -250 kJ/mol represent? How do you find this number if it is not given/what use does it have?

Daisylookinland

Does anyone remember what the website was that Dr. Lavelle mentioned in class that has learning modules similar to the ones we had for the first units? I could be wrong but I remember him making a comment about more learning modules.

Daisylookinland

On the midterm review worksheet, could someone explain how to draw the lewis structure for XeO2F2?

Daisylookinland

Could someone please explain the mathematics behind 13E to me?

Daisylookinland

Could someone explain why for 13D (I looked this up on the internet) the atoms have different electron configurations? I know that the electron configurations are: Neutral SC Atom: 1s2 2s2 2p6 3s2 3p6 3d1 4s2 SC2+ Ion: 1s2 2s2 2p6 3s2 3p6 3d1 Neutral K atom: 1s2 2s2 2p6 3s2 3p6 4s1 But could someon...

Daisylookinland

Could someone explain why for 13D (I looked this up on the internet) the atoms have different electron configurations? I know that the electron configurations are: Neutral SC Atom: 1s2 2s2 2p6 3s2 3p6 3d1 4s2 SC2+ Ion: 1s2 2s2 2p6 3s2 3p6 3d1 Neutral K atom: 1s2 2s2 2p6 3s2 3p6 4s1 But could someon...

Daisylookinland

Can someone please explain 10b to me? I don't understand why they wouldn't all be equal

Daisylookinland

For #6, how are you supposed to convert the molar mass of GarBreadium to kg in order to use the de broglie equation?

Daisylookinland

Just a clarification question:
Each metal has their own unique threshold energy, correct?
Also, does this mean that each metal has their own unique energy levels that their electrons can move between?

Daisylookinland

I understand that a photon of light is like a "packet" of energy, but is there any sort of numeric value to a photon?

Daisylookinland

In the photoelectric effect, does the electron that is released come from the metal that the EM radiation is shining on?

Daisylookinland

In Prof. Lavelle's lecture notes on how to find limiting reactants, he said in step 3 to calculate the molar mass of each reactant and product. However in the example he gave us he only calculated the molar mass for one of the products and not the other. Why is this?

Daisylookinland

Would you say that these worksheet problems are somewhat similar to problems we will see on the test? Or do you think doing problems out of the textbook are more helpful in preparing for the test?

Daisylookinland

Yes I believe so because if you were to multiply 1.1 by 9 to get closer to a whole number you would still be .1 away from the nearest whole number.

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