Search found 37 matches

by Calvin Patel 2H
Thu Mar 07, 2019 11:49 am
Forum: Second Order Reactions
Topic: graph for second order
Replies: 7
Views: 99

Re: graph for second order

It is a linear line with a positive slope since k is positive.
by Calvin Patel 2H
Thu Mar 07, 2019 11:48 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Pt
Replies: 14
Views: 208

Re: Pt

If there is no solid present, then you can add in Pt to make the cell diagram.
by Calvin Patel 2H
Thu Mar 07, 2019 11:47 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Ecell
Replies: 13
Views: 203

Re: Ecell

Use the reduction potential of the Cathode and the Anode.
by Calvin Patel 2H
Thu Mar 07, 2019 11:46 am
Forum: Zero Order Reactions
Topic: zero order rate?
Replies: 14
Views: 525

Re: zero order rate?

Yes, it is independent of concentration.
by Calvin Patel 2H
Thu Mar 07, 2019 11:46 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Study Advice
Replies: 30
Views: 370

Re: Study Advice

One thing I do is that I go on the Syllabus and it lists practice problems for each topic. So i go over those and try to understand them conceptually.
by Calvin Patel 2H
Thu Mar 07, 2019 11:44 am
Forum: Experimental Details
Topic: Final [ENDORSED]
Replies: 4
Views: 456

Re: Final [ENDORSED]

No but it will help to kind of understand it. Just the basics of it
by Calvin Patel 2H
Thu Mar 07, 2019 11:43 am
Forum: Second Order Reactions
Topic: pseudo-first-order reaction
Replies: 4
Views: 91

Re: pseudo-first-order reaction

It means that it can be first order with one of the reactants, but the overall order could be second order.
by Calvin Patel 2H
Thu Mar 07, 2019 11:42 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: the phases in a cell diagram
Replies: 4
Views: 77

Re: the phases in a cell diagram

Aqueous in the middle and solids on the outside.
by Calvin Patel 2H
Thu Mar 07, 2019 11:41 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: how is kinetics different?
Replies: 17
Views: 231

Re: how is kinetics different?

Thermo deals with change in energy. Kinetics deals with change in rxn rates
by Calvin Patel 2H
Thu Mar 07, 2019 11:40 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Galvanic Cells
Replies: 4
Views: 69

Re: Galvanic Cells

The reversibility of it makes energy and allows it to do work. If it were not reversible, there would be no production of energy.
by Calvin Patel 2H
Thu Mar 07, 2019 11:39 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: E cell
Replies: 5
Views: 88

Re: E cell

E^o cell is used when under standard conditions. E cell is under "nonstandard" conditions.
by Calvin Patel 2H
Thu Mar 07, 2019 11:38 am
Forum: Balancing Redox Reactions
Topic: Writing half reactions
Replies: 7
Views: 122

Re: Writing half reactions

You would put the H+ with the Cr2O7 since the oxygen atoms are balanced with H20, and the H20 is balanced with the H+
by Calvin Patel 2H
Thu Mar 07, 2019 11:37 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Test 2 Gibbs Free Energy
Replies: 5
Views: 83

Re: Test 2 Gibbs Free Energy

Melting ice is a spontaneous reaction, and a negative Gibbs Free Energy indicates a spontaneous reaction.
by Calvin Patel 2H
Thu Mar 07, 2019 11:36 am
Forum: Method of Initial Rates (To Determine n and k)
Topic: Units
Replies: 4
Views: 76

Re: Units

zero order: M/s
1st order: 1/s
2nd order : 1/(M*s)
by Calvin Patel 2H
Thu Mar 07, 2019 11:34 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst
Replies: 6
Views: 89

Re: Nernst

You can use either, but if you are converting between ln and log, use lnx=2.303logx
by Calvin Patel 2H
Thu Mar 07, 2019 11:33 am
Forum: Zero Order Reactions
Topic: zero vs. first vs. second reactions
Replies: 3
Views: 60

Re: zero vs. first vs. second reactions

you could also always graph the data and see which one is linear and then compare it to the first and second order rxns
by Calvin Patel 2H
Thu Mar 07, 2019 11:30 am
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Instantaneous vs Average
Replies: 11
Views: 112

Re: Instantaneous vs Average

The average rate is the rate over a given interval of time. Instantaneous rate is the rate at a given moment in time
by Calvin Patel 2H
Thu Mar 07, 2019 11:29 am
Forum: Zero Order Reactions
Topic: Order Reactions
Replies: 4
Views: 78

Re: Order Reactions

Yes. There are 3rd and 4th order reactions, but we don't need them for this class
by Calvin Patel 2H
Thu Feb 07, 2019 11:51 am
Forum: Calculating Work of Expansion
Topic: Pressure Units
Replies: 7
Views: 105

Re: Pressure Units

I think as long as you know the conversions between torr, bar, and atm, you'll be fine. Although I am not sure if he will give the values on the test or not.
by Calvin Patel 2H
Thu Feb 07, 2019 11:50 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Quiz 1 Number 3c
Replies: 6
Views: 119

Re: Quiz 1 Number 3c

you could write mol*L^-1 or M or mol/L
by Calvin Patel 2H
Thu Feb 07, 2019 11:49 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: ΔH and ΔU
Replies: 6
Views: 112

Re: ΔH and ΔU

The degree symbolizes that it is occurring at standard conditions of 1atm. There can be instances where there is no degree symbol and that means that there is a change in the standard conditions.
by Calvin Patel 2H
Thu Feb 07, 2019 11:46 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Adding Inert Gas
Replies: 10
Views: 196

Re: Adding Inert Gas

Adding an inert gas does change the pressure, but since the change in pressure was not caused by a change in volume and since the inert gas does not have any effect on the reaction, there will be no change in equilibrium.
by Calvin Patel 2H
Thu Feb 07, 2019 11:44 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Open vs Closed System
Replies: 13
Views: 176

Re: Open vs Closed System

In an open system, there is a possibility for matter to exchange with the solution since it is open and matter can be exchanged with the surroundings. However, in a closed system, only energy can be exchanged since the system is closed so no matter can enter or exit.
by Calvin Patel 2H
Thu Feb 07, 2019 11:43 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle
Replies: 11
Views: 230

Re: Le Chatelier's Principle

If you look at partial pressure as concentrations, if you increase the partial pressure of the reactants, the reaction will favor the products. If you increase the partial pressure of the products, the reaction will favor the reactants.
by Calvin Patel 2H
Thu Feb 07, 2019 11:41 am
Forum: Administrative Questions and Class Announcements
Topic: Week 5 Homework
Replies: 3
Views: 86

Re: Week 5 Homework

Yea. As long as we label it as what it is we are doing, it won't matter which ones you do
by Calvin Patel 2H
Thu Feb 07, 2019 11:39 am
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Degeneracy and Entropy
Replies: 1
Views: 46

Degeneracy and Entropy

Hey. I am still confused on the relation between Degeneracy and Entropy. Like if one increases does the other? Or how does the relationship work?
by Calvin Patel 2H
Thu Feb 07, 2019 11:37 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Le Chateliers Priniciple
Replies: 9
Views: 201

Re: Le Chateliers Priniciple

Technically an increase in pressure will favor the side with less moles, but it also depends on other factors such as if it is an inert gas or if there is a change in volume with the reaction.
by Calvin Patel 2H
Thu Feb 07, 2019 11:36 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Le Chateliers Priniciple
Replies: 9
Views: 201

Re: Le Chateliers Priniciple

If you increase the pressure, the reaction will favor the side with less moles.
by Calvin Patel 2H
Thu Feb 07, 2019 11:31 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Negative q
Replies: 7
Views: 102

Re: Negative q

A negative q signifies that the reaction is exothermic and that heat is being released with the reaction.
by Calvin Patel 2H
Thu Feb 07, 2019 11:29 am
Forum: Phase Changes & Related Calculations
Topic: Solids and Liquids
Replies: 5
Views: 74

Re: Solids and Liquids

It is because you cannot compress a solid or liquid like you can to a gas. So therefore, the pressure and change in volume are negated since it won't make a difference.
by Calvin Patel 2H
Sat Feb 02, 2019 5:32 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: closed vs isolated
Replies: 14
Views: 190

Re: closed vs isolated

With a closed system, there is still an exchange of energy with the surroundings. But, with a sealed system, there is no exchange of energy or matter with the surroundings.
by Calvin Patel 2H
Sat Feb 02, 2019 5:30 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Test Question
Replies: 4
Views: 89

Test Question

Just a quick question, would there be a difference in Kp and Kc if you are dealing with gases. Like, wouldn't both values be the same?
by Calvin Patel 2H
Sat Feb 02, 2019 5:15 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 3 methods for enthalpy calculation
Replies: 10
Views: 149

Re: 3 methods for enthalpy calculation

Usually you would want to use either the enthalpy of formation or of combustion methods. These are the most accurate and easiest to use. Using the mean bond enthalpy is less accurate and it can get confusing at times. It really depends on what equations you are given and what values you know. There...
by Calvin Patel 2H
Fri Feb 01, 2019 1:09 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 3 methods for enthalpy calculation
Replies: 10
Views: 149

Re: 3 methods for enthalpy calculation

Usually you would want to use either the enthalpy of formation or of combustion methods. These are the most accurate and easiest to use. Using the mean bond enthalpy is less accurate and it can get confusing at times. It really depends on what equations you are given and what values you know. There ...
by Calvin Patel 2H
Thu Jan 24, 2019 11:33 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH vs pKa
Replies: 3
Views: 62

Re: pH vs pKa

pKa is the -log(Ka value). pH is the -log(H3O+ concentration). If you are given the pH, you can use 10^-(pH value) and find your H3O+ concentration. Then you can set up an ice table and find the values at equilibrium and use those values to find the Ka value and pKa value.
by Calvin Patel 2H
Thu Jan 24, 2019 11:19 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Composition
Replies: 2
Views: 59

Re: Equilibrium Composition

There may also be situations where you could just use the basic outline for a chemical equation (HA, H3O+, OH-) if you know how the reaction proceeds. This could help you save time and make the problem easier instead of spending too much time getting the equation correct.
by Calvin Patel 2H
Thu Jan 24, 2019 11:15 am
Forum: Amphoteric Compounds
Topic: amphoteric v amphiprotic
Replies: 5
Views: 287

Re: amphoteric v amphiprotic

Amphoteric means that the substance can act as either an acid or a base. Amphiprotic means that the the substance can both and accept donate hydrogen ions (aka protons). All amphiprotic substances are also amphoteric (donate hydrogen ions (act as an acid) or accept a hydrogen ion (act as a base)). B...

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