CHEMISTRY COMMUNITY

Ashley Kenney 1E

Why would reduction take place in the cell with the higher concentration and not the cell with lower concentration?

Ashley Kenney 1E

Do the balanced half reactions include the stoichiometric coefficients to make the number of electrons in the oxidation and reduction halves equal, or is a balanced half reaction only referring to the individual half reaction without consideration for the other half? Do we only multiply by coefficie...

Ashley Kenney 1E

When do we know to include H2O in the rate law when given reaction mechanisms that require you to use the pre-equilibrium approach (for example, problem 15.101 in the sixth edition textbook)? Will a problem generally indicate when water is a solvent and when it isn't? Thank you in advance!

Ashley Kenney 1E

Can someone explain what a pseudo rate law is, and in what context we would use a pseudo rate law? Also, practically speaking, why is it important for us to use and understand pseudo rate laws? Thank you in advance!

Ashley Kenney 1E

Dr. Lavelle mentioned that microscopic reversibility is assumed/applied when K>>1 and k is much larger than k'. Can someone please explain what microscopic reversibility is and how it applies to forward and reverse reactions? Thank you in advance!

Ashley Kenney 1E

Can someone explain what relationship or equation the solution manual used to solve for time in parts a and b in question 15.27? I did the entire problem by solving for the rate constant first and then using the first order integrated rate law, as the solution manual did for parts c and d, but I'm c...

Ashley Kenney 1E

Why is it easier to study initial reaction rates rather than rates later in the reaction?

Ashley Kenney 1E

Why is $E^{\circ}=0V$ and why is E typically low voltage for a concentration cell?

Ashley Kenney 1E

How do you know when to put an inert conductor into a cell diagram?

Ashley Kenney 1E

When balancing half reactions, should we balance the electrons or the moles first? Also, we do we multiply the number of electrons by a stoichiometric coefficient?

Ashley Kenney 1E

Is there a way to tell which side of the reaction the OH- and the H2O should go on or is it just a matter of trying both until the equation is balanced?

Ashley Kenney 1E

What are the rules that we should know for assigning oxidation numbers? Thanks!

Ashley Kenney 1E

Why is change in internal energy a state function when it is comprised of things that are not state functions?

Ashley Kenney 1E

I'm a little confused as to how the equation $\Delta G^{\circ}=-RTlnK$ is derived.
Where does the equilibrium constant come from in this equation? Thanks!

Ashley Kenney 1E

Why is max work equal to the change in Gibbs free energy and what conditions must be met in order for this relationship to exist?

Ashley Kenney 1E

Why is the entropy of the universe greater than zero for a spontaneous reaction?

Ashley Kenney 1E

When is $\Delta U=0$ ?

Ashley Kenney 1E

In what situations would you need to calculate the limiting reagent of a chemical reaction?

Ashley Kenney 1E

When calculating work, does it matter what unit of pressure is being used? Or should we convert whatever unit of pressure we are given to atmospheres?

Ashley Kenney 1E

The textbook states that the internal energy of a monatomic ideal gas at a constant temperature is $\frac{3}{2}RT$ . How is this expression derived?

Ashley Kenney 1E

The textbook and homework questions reference the constant R often when calculating heat given off by a system -- for example, the molar heat capacity of a monatomic ideal gas at constant pressure is C_{P,m}=\frac{5}{2}R Is this R supposed to by the ideal gas constant and are we supposed to use the ...

Ashley Kenney 1E

How can we distinguish between heat and enthalpy, conceptually?

Ashley Kenney 1E

I'm a little confused what standard enthalpy of formation is. Can someone please explain it and its relationship to standard reaction enthalpy?

Ashley Kenney 1E

The question says to calculate pH and ignore the second second deprotonation only when the approximation is justified. What approximation should I be using in order to make this judgement, and why does the approximation allow me to ignore the second deprotonation?

Ashley Kenney 1E

I understand how to compare the strengths of bases based on the pka value of their conjugate bases, but the solution manual gives a further explanation of, "Although we should not draw conclusions from such a small data set, we might suggest the possibility that 1) arylamines < ammonia < alkyla...

Ashley Kenney 1E

What are the strong acids and bases that we should memorize?

Ashley Kenney 1E

The balanced equation for this reaction is supposed to be 2A <--> B+ 2C. Can someone explain how we get the stoichiometric coefficients by looking at the graph provided? Thank you!

Ashley Kenney 1E

A reaction has reached equilibrium when the concentration of reactants and products no longer changes. Reactions are still occurring, but the rate at which reactants become products is equal to the rate at which products become reactants. For example in the reaction A\leftrightharpoons B , equilibri...

Ashley Kenney 1E

Oh that makes sense. Thank you!

Ashley Kenney 1E

Yes, you're right, ideal gas law uses temperature in Kelvin

Ashley Kenney 1E

When determining the equilibrium relation, I understand where the terms x^2 and 2x come from, but I don't quite understand why we subtract 2x from the initial partial pressure of NO to create the expression of 1-2x. Can someone please explain this? Thank you!

Ashley Kenney 1E

For part b, it's asking for the percentage of molecules that have decomposed, so you want to use a ratio of the number of diatomic molecules in flask three minus the number in flask one, to the number of diatomic molecules you began with in flask one. Taking the difference between the number of diat...

CHEMISTRY COMMUNITY

Search found 32 matches

Concentration Cells

Balanced Half Reactions

Including H2O in Rate Law

Pseudo rate laws

Microscopic Reversibility

15.27 6th edition

Initial Reaction Rates

Low voltage in concentration cells

Conductors and Cell Diagrams

Order to balance

Balancing redox reactions in basic solutions

Rules for oxidation numbers

State Function

Equilibrium Constant and Gibbs Free Energy

Max work

Entropy of the Universe

Delta U

Limiting Reagents

Units for pressure

Internal Energy

Cp and Cv

Heat and Enthalpy

Standard enthalpy of formation

6th edition 12.81

6th edition 12.45

Strong acids and bases

6th edition 11.89

Re: Definition of equilibrium

Re: Help with question 11.43 6th edition [ENDORSED]

Re: Pv=nRT [ENDORSED]

Help with question 11.43 6th edition [ENDORSED]

Re: 11.7