CHEMISTRY COMMUNITY

Katelyn Pham 4E

In the book it says "A is a measure of the rate at which molecules collide" and this rate refers to the frequency of molecules colliding.

Katelyn Pham 4E

Adding onto this, the slow step is the rate determining step.

Katelyn Pham 4E

Lavelle mentioned mentioned this term when talking about intermediates, can someone please explain what he meant?

Katelyn Pham 4E

The reaction rate for a second order graph has a positive slope because k (the slope) is positive.

Katelyn Pham 4E

Yes, electrolysis takes place in an electrolytic cell where electrical energy is converted into chemical energy.

Katelyn Pham 4E

The unique rate only applies to a given reaction such as a A ---> b B + c C because it has coefficients, unlike instantaneous rate.

Katelyn Pham 4E

Looking at the equation sheet for Ecell and E⁰cell will help find relationships and to start off question a, E⁰cell does not decrease with time whereas Ecell does.

Katelyn Pham 4E

In the beginning of the question it mentioned that the reactions are taking place in a basic solution and to balance redox rxns in a basic solution you add OH- and H2O to balance it instead of H+.

Katelyn Pham 4E

If a compound is thermodynamically stable does that mean it is also spontaneous?

Katelyn Pham 4E

The question will tell you if the redox reaction is in an acidic or basic solution.

Katelyn Pham 4E

Why must anodes be on the left and cathodes on the right?

Katelyn Pham 4E

After lecture from your TA's today 2/20.

Katelyn Pham 4E

Ecell = Cathode(right)-Anode(left) and this is found from the half oxidation and reduction equations.

Katelyn Pham 4E

A spontaneous reaction must release free energy so delta G must be negative to be spontaneous.

Katelyn Pham 4E

What is the relationship between entropy and the mass of an atom?

Katelyn Pham 4E

State functions could be thought of in the pneumonic that Lyndon told us
PD TV HUGS (Pressure, Temperature, Velocity, H (enthalpy), U (internal energy), G (gibbs free energy), S (entropy) are all state functions:
"under Pressure, feeling Depressed, just wanna watch TV and get HUGS"

Katelyn Pham 4E

W = # of possible energy states ^ # of molecules

Katelyn Pham 4E

Since work=w=-PΔV, when V is constant, there is no change in V or ΔV=0 and w=-P(0)=0. So ΔU=q.

Katelyn Pham 4E

Why is ΔU referred to heat transfer at constant volume and ΔH for constant pressure? How are they related?

Katelyn Pham 4E

A reversible process is one that can be reversed by an "infinitesimal" change in a variable.

Katelyn Pham 4E

This is correct. If work is done BY a system, energy is being released making it exothermic resulting in w being negative. If work is done ON a system, w is positive, because it is endothermic and energy is being put into the system.

Katelyn Pham 4E

You know that something is in its standard state if it satisfies certain conditions: 1. The temperature should be 25 degrees Celsius (usually). 2. All liquids and solids are pure. 3. The concentration of all solutions is 1 M at 1 atm. 4. All gases are at 1 atm. 5. Elements are in their most stable p...

Katelyn Pham 4E

You calculate the reaction quotient (Q) when you are determining which direction the reaction shifts. Q=[Products]/[Reactants] just as K. If Q<K then the reaction shifts right to form towards products and if Q>K then the reaction shifts left to form towards the reactants.

Katelyn Pham 4E

Because K is a ratio of units, they are cancelled out in the equilibrium expression making it unitless.

Katelyn Pham 4E

There is also a list of strong acids and bases. Here is a quizlet link of the top 6 strong acids and bases!

https://quizlet.com/41246443/6-strong-a ... ash-cards/

Katelyn Pham 4E

Le Chatelier's Principle adjusts to minimize the effect of changes. For example, when more reactant is added, more product will form until the original product to reactant ratio is attained.

Katelyn Pham 4E

If Ka<10^-3, then it's a weak acid. So does this mean that the larger the pKa, the weaker the acid?

Katelyn Pham 4E

Also, if a reaction is exothermic while forming products, then heating will favor reaction formations.

Katelyn Pham 4E

First you'd have to make an ICE table.

Katelyn Pham 4E

For the initial concentration, K= 100. When pressure doubled, Q=25. When Q<K, the reaction shifts to the right.

CHEMISTRY COMMUNITY

Search found 30 matches

Re: Frequency factor A

Re: Pre equilibrium approach

"Bottle Neck"

Re: graph for second order

Re: Electrolysis

Re: Unique vs instantaneous rate

Re: Question 14.83 (Sixth Edition)

Re: 14.5 6th edition

Thermodynamic Stability

Re: basic/acidic solutions

Anode v. Cathode

Re: midterm

Re: Positive vs Negative E value

Re: Spontaneous vs Not Spontaneous

Entropy and mass

Re: state function

Re: Finding W (degeneracy)

Re: Work and Internal Energy

The Relationship Between ΔH and ΔU

Re: Reversible rxn

Re: work done by vs on a system

Re: An element's standard state

Re: Calculating Q

Re: Units for equilibrium constants

Re: How to tell if a chemical is an acid or base?

Re: Le Chatelier's Principle

Pka and Acidty

Re: Exothermic Reactions

Re: Q 11.47

Re: Change in pressure