I'm reading over the book right now and was wondering if we need to know about the calomel electrode or glass electrode?
Thanks!
Search found 32 matches
- Wed Mar 13, 2019 9:08 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Calomel Electrode
- Replies: 1
- Views: 207
- Tue Mar 12, 2019 12:10 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Collision Theory
- Replies: 5
- Views: 750
Re: Collision Theory
I believe that simply knowing that for a reaction to happen molecules must collide in the proper orientation and with enough kinetic energy to overcome the activation energy to synthesize products
- Tue Mar 12, 2019 12:06 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Melting of ice
- Replies: 9
- Views: 1063
Re: Melting of ice
This is a spontaneous reaction (dG <0 ) you can look at it as there is no work being done to the system to cause the ice to melt other than an exchange of heat from the sun to the solid ice
- Tue Mar 12, 2019 12:04 am
- Forum: Balancing Redox Reactions
- Topic: k from lnK
- Replies: 5
- Views: 4095
Re: k from lnK
To get k alone you must raise lnK as the exponent for the number e, this essentially negates the ln and leaves k alone for you to solve
- Tue Mar 12, 2019 12:03 am
- Forum: Balancing Redox Reactions
- Topic: Short hand notation
- Replies: 8
- Views: 875
Re: Short hand notation
The purpose of the salt bridge is to inhibit the reaction from reaching equilibrium too quickly and maintains a neutral charge balance as electrons move from anode to cathode
- Mon Mar 11, 2019 11:58 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Determine if molecule is in most stable form
- Replies: 5
- Views: 807
Re: Determine if molecule is in most stable form
If it isn't a diatomic molecule, you would probably have to find this out by calculating the dG for the reaction if it is negative the molecule is more stable than its elements and if the value is positive then vice versa
- Mon Mar 11, 2019 11:54 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: negative and k
- Replies: 3
- Views: 437
Re: negative and k
The negative in the equation already accounts for the negative slope however the actual value of the rate constant cannot be negative as seen from its units mol/L/s since time is involved you cannot have negative time
- Mon Mar 11, 2019 11:51 pm
- Forum: Experimental Details
- Topic: Activated Complex vs. Transition State
- Replies: 2
- Views: 2394
Re: Activated Complex vs. Transition State
The transition state represents only the highest potential energy configuration of atoms while the activated complex is the possible configurations of those atoms that are close to the transition state
- Mon Mar 11, 2019 11:46 pm
- Forum: Experimental Details
- Topic: Fast vs Slow
- Replies: 7
- Views: 1233
Re: Fast vs Slow
The problem will explicitly state it or you could be shown the values
- Mon Mar 11, 2019 11:45 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Study Advice
- Replies: 73
- Views: 7326
Re: Study Advice
Personally, I use the review sessions to solidify my understanding of the material but for the concepts that are more difficult to grasp in lecture, I usually take notes from the book. I like the way the book explains concepts in depth. Although we aren't tested on what the concepts actually are it ...
- Mon Mar 11, 2019 11:40 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Log version vs ln Version
- Replies: 7
- Views: 840
Re: Log version vs ln Version
It really shouldn't matter the difference is simply their base number (log with base 10 and ln with base e)
- Mon Mar 11, 2019 11:36 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Closed vs Isolated
- Replies: 5
- Views: 1194
Re: Closed vs Isolated
the closed system simply exchanges energy whereas an isolated system does not exchange energy or matter, the best example for an isolated system that we have seen is a bomb calorimeter
- Mon Mar 11, 2019 11:34 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Equations
- Replies: 5
- Views: 912
Re: Equations
understanding conceptually what is happening and recognizing what the question is asking is probably a better approach for studying overall, since most of the equations will be on the formula sheet, as long as you understand when and how to use the equations, that will be more beneficial to you
- Mon Mar 11, 2019 11:31 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: n and significant figures
- Replies: 5
- Views: 905
Re: n and significant figures
The value of n is determined by the electrons that are canceled out when balancing the redox reactionAbby-Hile-1F wrote:How do you determine what n is?
- Mon Mar 11, 2019 11:29 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing Redox Reactions
- Replies: 5
- Views: 735
Re: Balancing Redox Reactions
The easiest way to balance redox reactions in basic solution is following the same steps as if it were in acidic solution and in the very end at OH- to both sides to cancel the H+ ions and you will either be left with water or OH-
- Mon Mar 11, 2019 11:27 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ka2 in Acids
- Replies: 2
- Views: 421
Re: Ka2 in Acids
Usually problems that will have you consider the value of Ka2 will give you a Ka1 value that is considerably small, and may ask you to find Ka2 either the value or expression or both
- Mon Mar 11, 2019 11:25 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ka/b and pKa/b relationship
- Replies: 2
- Views: 274
Re: Ka/b and pKa/b relationship
It's better to remember the relation between Ka and pKa (vice versa with Kb) but the smaller the value of Ka, then the larger the value of pKa and thus the weaker the acid, if a weak acid has a small Ka value it's conjugate base will have a large Kb value
- Mon Mar 11, 2019 11:20 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: equilibruim based on enthalpy
- Replies: 3
- Views: 401
Re: equilibruim based on enthalpy
Looking at the change in enthalpy alone won't be enough information to determine the equilibrium of a reaction or not but the sign of it does tell you whether heat is a reactant or product and from there you can follow the steps mentioned above.
- Mon Mar 11, 2019 11:16 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Pre equilibrium approach
- Replies: 2
- Views: 304
Re: Pre equilibrium approach
The reason for this substitution was because we needed to derive the rate law to match the observed rate law while also knowing that [N2O2] was a dimer and not included in the overall reaction
- Mon Mar 11, 2019 11:09 pm
- Forum: Phase Changes & Related Calculations
- Topic: Isothermal
- Replies: 9
- Views: 1155
Re: Isothermal
If it is not explicitly stated that temperature changes, you can also assume the reaction is isothermal, this also goes with systems in standard state
- Mon Mar 11, 2019 11:06 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Direction of a Reaction
- Replies: 8
- Views: 995
Re: Direction of a Reaction
If you aren't directly given K, then usually you would have to calculate it in an earlier part of the question and then compare Q to K.
- Mon Mar 11, 2019 11:06 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Direction of a Reaction
- Replies: 8
- Views: 995
Re: Direction of a Reaction
If you aren't directly given K, then usually you would have to calculate it in an earlier part of the question and then compare Q to K.
- Mon Mar 11, 2019 11:03 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation number?
- Replies: 12
- Views: 7639
Re: Oxidation number?
Once you get the hang of what oxidation numbers belong to certain elements, then you can use those to calculate the unknown oxidation numbers of other elements. To do this you must match the overall charge of the substance with the unknown element
- Mon Mar 11, 2019 12:12 pm
- Forum: First Order Reactions
- Topic: 15.27
- Replies: 7
- Views: 1396
Re: 15.27
Do you neglect k in the equations? and do you have to solve for regular t or can you use t(1/2) in the equation?
- Thu Mar 07, 2019 12:33 am
- Forum: Phase Changes & Related Calculations
- Topic: 6th edition 9.19
- Replies: 2
- Views: 335
Re: 6th edition 9.19
You use these 3 different steps because we are not given standard entropy of vaporization at 85C, this is essentially making a loop, you heat the substance to 100 and calculate the entropy then while T =100C meaning it remains constant, then you calculate the change in entropy there, and finally you...
- Thu Mar 07, 2019 12:26 am
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: system v surroundings entropy
- Replies: 4
- Views: 696
Re: system v surroundings entropy
Generally, when we consider a reaction and the system it occurs in the surroundings are the immediate surroundings so when calculating entropy for them we usually keep the system positive because the reaction is what we observe the exchange of entropy to the surroundings are negative because it is t...
- Thu Mar 07, 2019 12:21 am
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: R constants
- Replies: 40
- Views: 2327
Re: R constants
One of the good things about the final is we are given the constants sheet with all the gas constants given to us, but like previously stated, the best way to approach a problem where you have to use an R constant is to look at the values and units given and use the constant with most (if not all) t...
- Thu Mar 07, 2019 12:16 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: strong and weak acids
- Replies: 5
- Views: 766
Re: strong and weak acids
Weak acids tend to have higher pH because they do not tend to fully dissociate into hydronium ions and their respective anions. When you calculate the pH of a solution, you take the -log of the concentration of Hydronium ions, for weak acids this concentration will be relatively low compared to stro...
- Thu Mar 07, 2019 12:10 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Temp affecting K
- Replies: 4
- Views: 558
Re: Temp affecting K
K is not affected by changes in concentrations of a system; however Q is since it is a measure of where the reaction is at any point in time relative to equilibrium (at K) but the only thing that can change the actual value of K is temperature
- Thu Mar 07, 2019 12:07 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Practice problem help
- Replies: 2
- Views: 1401
Re: Practice problem help
All your answers are correct, specifically for a) if the volume of the container was halved, the inverse relationship between pressure and volume states that the pressure of the system should then increase by the inverse of 1/2 which is 2; for c) since CCl4 is a product (and the reaction is at equil...
- Thu Mar 07, 2019 12:02 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: ICE
- Replies: 19
- Views: 1515
Re: ICE
E is the concentration of Reactants and Products at Equilibrium, after the Change
- Thu Mar 07, 2019 12:02 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: ICE
- Replies: 19
- Views: 1515
Re: ICE
E is the concentration of Reactants and Products at Equilibrium, after the Change