CHEMISTRY COMMUNITY

CaminaB_1D

have we learned how to use the arrhenius equation in the way that the homework problems 15.61 and beyond use them

CaminaB_1D

yes that cleared it up for me! thank you!^^^

CaminaB_1D

someone correct me if I'm wrong but if it asks for the rate law of that specific step in the rxn I think you do include intermediates. However it is not included in the rate law of the overall reaction. The slow step indicates the overall rate law so if there was an intermediate in the reactants of ...

CaminaB_1D

How would u indicate molecularity when given step 1 and 2 for a rxn mechanism

CaminaB_1D

Do stoichiometric coefficients only matter for the unique rate or is there other instances in kinetics where stoichiometric coefficients are considered?

CaminaB_1D

What exactly does rxn mechanisms tell us?

CaminaB_1D

is the instantaneous rate different from the unique rate or are they the same thing?

CaminaB_1D

If a reaction is second order with respect to reactant A, if the concentration of reactant A is doubled, is the rate quadrupled?

CaminaB_1D

Is there a conceptual meaning behind a second order reaction?

CaminaB_1D

Is there a conceptual meaning behind a zero order reaction?

CaminaB_1D

What is the frequency factor, A?

CaminaB_1D

Can anyone post the graphs for each rxn and sort of explain them? I didn't really get them down in my notes in class

CaminaB_1D

I also had a problem with this question but for part c "How much time must elapse for the concentration of A to decrease to (c) 15% of its initial concentration" I used the half life of a first order rxn to find k, then solved for t using the first order integrated rate law, however I cann...

CaminaB_1D

what is reducing power and oxidizing power? How do these relate to Ecell?

CaminaB_1D

How do we use the derivative to find the unique rate?? any math examples or problems of this?

CaminaB_1D

Complete the following statements relating to the
production of ammonia by the Haber process, for which
the overall reaction is N2(g) 3 H2(g) S 2 NH3(g).

What is the Haber process?

CaminaB_1D

How do I know when to use an inert electrode?

CaminaB_1D

If asked to write the cell diagram for a reaction, how do you know if there should be a salt bridge or porous disk? Is one more common than the other? will it be specified somewhere in the problem?

CaminaB_1D

If they just give you a balanced redox reaction, do you then just look back at the half reactions and balance the charges again to figure out what the difference in moles of electrons were to get your n?

CaminaB_1D

What is the best way to remember how to identify which is the oxidizing agent and which is the reducing agent?

CaminaB_1D

9.63 Determine which of the following compounds are stable with respect to decomposition into their elements under standard conditions at 25 C (see Appendix 2A): (a) PCl5(g); (b) HCN(g); (c) NO(g); (d) SO (g). After calculating the standard free energy of formation of the compounds, why does a posit...

CaminaB_1D

I do not completely understand how the values of enthalpy and entropy explain the spontaneity of a reaction (aka the concepts of the Gibbs free energy equation), can someone give me a quick run down?

CaminaB_1D

Can anyone share the answers to questions 1-3 on Lyndon's review? I was an hour late to the review session bc I had a midterm

CaminaB_1D

Is there any information up for midterm review sessions yet?

CaminaB_1D

Does anyone know which problems in the sixth edition cover what was gone over in today's lecture (Monday 2/4)? thanks!

CaminaB_1D

some of the homework problems do not seem to match up with any of the examples we did in class. Where do these start in the 6th edition

CaminaB_1D

A careless laboratory technician wants to prepare 200.0 mL of a 0.025 m HCl(aq) solution, but uses a 250.0-mL volumetric ask by mistake.

part b asks you to find the actual pH of the solution in the 250.0 mL flask, how do you do this with information given?

CaminaB_1D

Can anyone explain the reasoning behind, given a Kw (at any temperature, doesn't really matter), why do we know that the concentrations of [H30+] and [OH-] the same?

CaminaB_1D

When do you know you have to use an ICE table?

CaminaB_1D

Can someone please explain this problem:

Use the information in Table 11.2 to determine the value of K at 300 K for the reaction 2 BrCl(g) + H2(g) ∆ Br2(g) + 2 HCl(g)

CaminaB_1D

I don't understand how to calculate K for part c of this problem, can someone please explain the reasoning for the answer that the solution manual comes to? 11.37 For the reaction N (g) + 3 H (g) ∆ 2 NH (g) at 223 400. K, K 41. Find the value of K for each of the following reactions at the same temp...

CaminaB_1D

11.33 A 0.500-L reaction vessel at 700. K contains 1.20 mmol SO2(g), 0.50 mmol O2(g), and 0.10 mmol SO3(g). At 700. K, Kc 1.7 106 for the equilibrium 2 SO2(g) O2(g) ∆ 2 SO3(g). (a) Calculate the reaction quotient Qc. (b) Will more SO3(g) tend to form? Why do we divide each elements moles by the volu...

CaminaB_1D

what was the answer to this 6b on test 3?

Order these cations from least to most polarizing power: Li+,Ca2+,Cs+,Ba2+

and can you explain why?

CaminaB_1D

are there any practice problems for acid rain?

CaminaB_1D

Can someone walk me through exercise 12.25?

Calculate the initial molarity of Ba(OH)2 and the molarities of Ba2 , OH , and H3O in an aqueous solution that contains 0.43 g of Ba(OH)2 in 0.100 L of solution.

CaminaB_1D

Based off the name of the coordination compound given, if there are multiple different ligands does it matter what order you write them when writing out the formula?

CaminaB_1D

Can someone walk me through how to get the formula of sodium bisoxalato(diaqua)ferrate(III)?

CaminaB_1D

If we are given the name of a coordination compound, for example, potassium hexacyanidochromate(III), I see that the 'ate' in chromate means a negative complex. But when writing out the formula, since there is a potassium(a cation), does it counter the negative charge of the complex and therefore th...

CaminaB_1D

can someone explain 23 and why porphyrin ligand is tetradentrate

CaminaB_1D

Can someone please explain why the bond angles increase as the s-character of a hybrid orbital increases

CaminaB_1D

4.31 "State the relative orientations of the following hybrid orbitals: (a) sp3; (b) sp; (c) sp3d2; (d) sp2."

What does it mean by relative orientations? what answer is this question exactly looking for?

CaminaB_1D

Can someone explain to me how we know there is a dipole moment in terms of bond vectors? perhaps an example as well?

CaminaB_1D

which is the central atom in CNO- ?

CaminaB_1D

Did we go over the difference between electron geometry and molecular shape?

CaminaB_1D

How do you know when certain dipole moments cancel each other out?

CaminaB_1D

Which was the equation given for dipole moments?

CaminaB_1D

can someone explain the polarizing power of a cation? Does it follow a trend on the periodic table? Does it apply for compounds?

CaminaB_1D

for this hw question 3.77 "For each pair, determine which compound has bonds with greater ionic character: (a) HCl or HI; (b) CH4 or CF4; (c) CO2 or CS2", I understand we need to choose the compound that has a greater difference in electronegativites between its atoms, but for letter c how...

CaminaB_1D

Do we need to know Lewis acids and bases for the midterm?

CaminaB_1D

Is this something we should worry for the midterm?

CaminaB_1D

When using the Heisenberg uncertainty, what are the correct units to use for the components of the equations? (mass, velocity, distance, etc.)

CaminaB_1D

Can someone please explain to me how to get the electron configuration of Tungsten[W]? I know what the answer is but I just do not know how to get there

CaminaB_1D

can someone please explain to me how effective nuclear charge works in terms of 2.37. Thanks! "Which of the following statements are true for many- electron atoms? If false, explain why. (a) The effective nuclear charge Zeff is independent of the number of electrons present in an atom. (b) Elec...

CaminaB_1D

Can someone show me how to derive the DeBroglie equation? I am looking back in my notes and I must have written something down wrong because it is not making sense

CaminaB_1D

Here is the question for reference: Which of the following increase when the electron in a hydrogen atom undergoes a transition from the 1s-orbital to a 2p-orbital? (a) Energy of the electron. (b) Value of n. (c) Value of l. (d) Radius of the atom. Can someone explain to me how we would determine th...

CaminaB_1D

If you are given the number of photons produced (per second) and the wavelength of the light, how would you find how much energy (in joules) is produced as radiation at that wavelength? (referring to 1.59 in the 6th edition)

CaminaB_1D

I am having trouble figuring this out: 1.15 says "In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line." I understand ...

CaminaB_1D

What does the 'h' represent here in this equation?

Sorry, disregard this question. I knew it was Planck's constant, just had it rounded in my notes

CaminaB_1D

Is there any relationship between the size of a wavelength and the energy of a photon? Or is the energy of a photon only relative to the frequency of a wave because of the equation E=hv?

CaminaB_1D

can anyone help with M.7 in the sixth edition? I think I am doing something wrong with converting the masses to moles that is preventing me from figuring out the rest of the problem

CaminaB_1D

M.3 in the sixth edition!

CaminaB_1D

Can someone explain the step of calculating reactant moles when solving a stoichiometry problem. In other words, I do not understand the "why" behind the calculations of this step.

CaminaB_1D

In the equation V=n/c, what does the 'n' represent?

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