CHEMISTRY COMMUNITY

Connie2I

For 14.15a, when writing a cell diagram for AgBr (s) <-> Ag+(aq) + Br-(aq), is the anode/cathode just assumed to be Ag(s)? And why?

Connie2I

What is the difference between calculating delta G through G(products) - G(reactants) using values given and calculating delta G through the equation deltaG = deltaH - TdeltaS?

Connie2I

Is there a way to know when exactly we should be using unique rate?

Connie2I

In real life situations, why is delta S always greater than Q(rev)/T unlike the ideal situation where delta S is equal to Q(rev)/T?

Connie2I

What does being an intensive/extensive property mean?

Connie2I

In a problem, how do we know to use the equation for calculating entropy of adiabatic expansion of an Ideal Gas, in other words, using delta S = nRln(V(final) - V(Initial))?
Will the problem just state if the system is adiabatic or are there any more key words to be aware of?

Connie2I

What exactly is the relationship between free energy and pressure? In the notes, it says free energy is dependent on pressure, but I'm not quite sure how.

Connie2I

How can you tell the molar entropy of a substance and what does it mean?

Connie2I

What is the conceptual difference between calculating the standard enthalpy of a phase change vs. the standard entropy of a phase change?

Connie2I

Was there a formula to use when calculating a phase change like vaporization or anything? In the notes it said something like deltaH of vaporization = H vapor - H liquid, but the solutions manual for problem 8.37 seems to use q and moles instead so I wasn't sure

Connie2I

For problem 8.13, why is the value of q = 947 kJ negative? I had thought it was positive because the question said that heat was absorbed.

Connie2I

When calorimeter is mentioned in the question, does it give you a hint as to which equation to use? If so, then how?

Connie2I

For 8.61, could someone tell me why the second equation N2 (g) + 3H2 (g) --> 2NH3 (g) is supposed to be switched, which would give the value enthalpy of +92.22 kJ? Since the question is asking for the reaction enthalpy value of H2 (g) + Br2 (l) --> 2HBr (g) the H2 in both equations are both on the r...

Connie2I

How do you know when to use/apply the Ideal Gas Law in a question?

Connie2I

What's the relation of thermodynamics to the energy available to do work, since heat is a form of energy? When a question refers to work, is it referring to thermodynamics as well?

Connie2I

How do pressure and volume affect a reaction?

Connie2I

How do we know to differentiate between using the DeBrogile equation and the equation of c = (wavelength) (frequency)? For example, when we are given the frequency and asked to find wavelength, how do we know whether or not to use one equation rather than the other since both variables are present i...

Connie2I

Is there a difference between naming with the suffix -o and-ido? For example, hydroxo and hydroxido

Connie2I

When is it necessary to take the lobes of an orbital into account? For example, using px, py, and pz.

Connie2I

For problems such as 12.29C, why do we multiply Ba(OH)2 by 2 to get the concentration of OH? Is it because of the 2 outside the parentheses?

Connie2I

In 12.21, how does Kw = [H3O+][OH-] manage to turn into [OH-] = Kw/[H3O+]?
Also, are we expected to memorize that Kw = [H3O+][OH-] = 1.0 x 10^-14?

Connie2I

In 17.27 a and c, why is it that cyanido (CN-) is changed to cyano when naming the compound?

Connie2I

Could someone explain what the difference is between a radial node and a radial plane and how to figure them out in a problem?

Connie2I

When trying to figure out how many unpaired electrons an atom has, what would you need to know to draw the configuration?

Connie2I

Could someone explain the difference between a subshell and an orbital? I've heard both of the terms be referred to in the same problem, but I wasn't quite sure how they differed.

Connie2I

I was confused about whether wavelength had to be in nanometers or simply meters, because in the module, the answer to 39. was 486 nm, so I answered the next question number 40. with 746 nm, which was wrong. I'm assuming the correct answer was 7.46 x 10^-6 m, but I wasn't sure how to differentiate w...

Connie2I

32. B. In a second experiment a shorter wavelength light source is used resulting in ejected electrons with a kinetic energy of 4.200 x 10-19 J. What is the energy of this incident light? What is the wavelength of this incident light? I used the Energy of a photon = (threshold)(kinetic energy) and g...

Connie2I

For 30C, to find the frequency, do we have to use the equation where Energy of the photon = (Threshold energy)(kinetic energy)?

Connie2I

Hi, not sure if I'm posting in the right forum or not, but in the test, is it necessary for us to convert our answer into scientific notation?

CHEMISTRY COMMUNITY

Search found 29 matches

14.15

Difference between calculations

Re: Unique Rate [ENDORSED]

Ideal Situation vs. Real Situation

Extensive/Intensive Property [ENDORSED]

Adiabatic Expansion of an Ideal Gas

Free Energy and Pressure

Molar Entropy

Enthalpy vs. Entropy

Phase Change Question

8.13

Calorimeter

8.61

Gas Law

Work? [ENDORSED]

Pressure and Volume

Difference between DeBrogile and Light

Ligand Suffix

Lobes [ENDORSED]

12.29C

12.21

17.29 a and c

Radial Nodes/Planes

Unpaired Electrons [ENDORSED]

Difference between subshell and orbital [ENDORSED]

Wavelength Units

Photoelectric Effect Post-Module Assessment 32B, 33 [ENDORSED]

Photoelectric Post Assessment Module 30C

Scientific Notation [ENDORSED]