Search found 32 matches
- Mon Mar 12, 2018 11:58 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Functional Groups
- Replies: 7
- Views: 1101
Re: Functional Groups
So functional groups are on the final?
- Mon Mar 12, 2018 11:49 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Reaction Mechanism Steps
- Replies: 4
- Views: 298
Re: Reaction Mechanism Steps
Yes it would be the slow step
- Mon Mar 12, 2018 11:29 pm
- Forum: *Nucleophiles
- Topic: What are nucleophiles?
- Replies: 2
- Views: 620
Re: What are nucleophiles?
A nucleophile is a chemical species that donates an electron pair to an electrophile to form a chemical bond in relation to a reaction
- Thu Mar 08, 2018 3:57 pm
- Forum: First Order Reactions
- Topic: Equation variations
- Replies: 9
- Views: 678
Re: Equation variations
You can aso use this equation for first order:
[A]=[Ainitial]e^(-k*t)
[A]=[Ainitial]e^(-k*t)
- Thu Mar 08, 2018 3:56 pm
- Forum: Second Order Reactions
- Topic: Half Life for First Order vs Second Order
- Replies: 5
- Views: 721
Re: Half Life for First Order vs Second Order
Half life of first order reactions is linear while for second order it is not
- Thu Mar 08, 2018 3:54 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: 15.17
- Replies: 6
- Views: 612
Re: 15.17
Yes you are right. Since C is a zero order, its concetration is ignored when determinining the rate of A and B
- Thu Mar 08, 2018 3:53 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Homework Problems
- Replies: 3
- Views: 333
Re: Homework Problems
Its 1-39 plus some of the integrated problems in the end of the section.
- Sat Mar 03, 2018 4:49 pm
- Forum: First Order Reactions
- Topic: problem 15.23B
- Replies: 3
- Views: 311
Re: problem 15.23B
You can also just use [A]=[A]initial * e^-kt, which is just a simplified verision of the ln[A]=-kt+ln[A]initial equation
- Sat Mar 03, 2018 4:46 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetics Test/Final
- Replies: 2
- Views: 219
Re: Kinetics Test/Final
My TA said you should know how to derive them
- Sat Mar 03, 2018 4:43 pm
- Forum: General Rate Laws
- Topic: 15.27
- Replies: 2
- Views: 258
15.27
How do you calculate the time it takes for something to get to 15% of its initial concetration and 1/9th of its initial condition if you are given only its half life?
- Sat Feb 24, 2018 5:20 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic cell set up
- Replies: 8
- Views: 563
Re: Galvanic cell set up
It's usually on the left, but you can write it on the right.
- Sat Feb 24, 2018 5:01 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: n
- Replies: 8
- Views: 476
Re: n
N is the number of moles
- Tue Feb 20, 2018 8:51 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 14.15a
- Replies: 4
- Views: 322
14.15a
Why is it AgBr+e- ==>Br- + Ag and not just Br + e- ==> Br-?
- Tue Feb 13, 2018 1:41 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Midterm
- Replies: 2
- Views: 258
Re: Midterm
There is no need to know how to derive anything, but knowing how to derive can be helpful for solving the problems, how the equations relate to one another, and thinking through the problems.
- Tue Feb 13, 2018 1:39 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Problem 9.69
- Replies: 1
- Views: 170
Problem 9.69
For the problem 9.69, do you just multiply the deltaG of the NADH reaction by 3 and divide it by the delta G of the reaction for ATP?
- Tue Feb 13, 2018 1:38 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Extensive vs Intensive
- Replies: 3
- Views: 300
Re: Extensive vs Intensive
An intensive property does not rely on the mass of the substance while an extensive property does.
- Tue Feb 13, 2018 1:36 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: delta S(system) vs delta S(surroundings)
- Replies: 4
- Views: 4919
Re: delta S(system) vs delta S(surroundings)
Delta S of the universe must equal 0, which happens in reversible reactions at equilibriums.
- Tue Feb 13, 2018 1:35 am
- Forum: Calculating Work of Expansion
- Topic: equilbrium = reversible
- Replies: 3
- Views: 285
Re: equilbrium = reversible
All reactions at equillibrium are reversible as the nature of equilibirums (flow in both directions) requires the reaction to be reversible.
- Tue Feb 13, 2018 1:33 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.77
- Replies: 2
- Views: 260
Re: 8.77
The Kekule structure looks like this (https://www.google.com/search?q=Kekule+ ... 9WukM-NQWM:).
- Sun Feb 04, 2018 12:13 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: 9.25 Avogadro's Number?
- Replies: 2
- Views: 251
Re: 9.25 Avogadro's Number?
Its residual molar entropy, therefore SO2F2 must be a mole.
- Sun Feb 04, 2018 12:11 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: ΔS(universe)
- Replies: 6
- Views: 445
Re: ΔS(universe)
Delta S can only be zero in an equilibrium, one way to think about that could be that disorder and order are equal. Likewise, entropy in the universe is always increasing.
- Sun Feb 04, 2018 12:09 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneous
- Replies: 14
- Views: 1055
Re: Spontaneous
Just to add on, spontaneity refers to the fact that the reaction is favored to occur. An example of this concept would be a boulder on a hill, as it would likely roll down the hill.
- Mon Jan 29, 2018 10:16 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: What is the relationship between reversibility and spontaneity of a reaction?
- Replies: 3
- Views: 328
Re: What is the relationship between reversibility and spontaneity of a reaction?
There is no direct correlation between the two as they are dependent on different things.
- Thu Jan 25, 2018 9:21 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Car Engine [ENDORSED]
- Replies: 4
- Views: 389
Re: Car Engine [ENDORSED]
Since gasoline is inputted into the engine and stuff is also outputted(heat/gas), it is an open system.
- Thu Jan 25, 2018 9:19 pm
- Forum: Calculating Work of Expansion
- Topic: Units
- Replies: 2
- Views: 403
Re: Units
1 atm is equal to 760 torr. The unit for P in w=-PdeltaV is usually in atm as the answer to this equation is then usually converted to J using (101.325J/L*atm).
- Thu Jan 25, 2018 9:15 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Question 9.7
- Replies: 1
- Views: 379
Question 9.7
"Assuming that the heat capacity of an ideal gas is independent of temperature, calculate the entropy change associated with raising the temperature of 1.00 mol of ideal gas atoms reversibly from 37.6 C to 157.9 C at a) constant pressure and b) constant volume" What exactly is the question...
- Sat Jan 20, 2018 2:09 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Ch 8 #53 Part b
- Replies: 7
- Views: 669
Re: Ch 8 #53 Part b
The reason it is negative is because the temperature raises, meaning that the reaction had to release energy. The reason it is just q=C*deltaT is because it is the equation for the calorimeter, which does not include mass.
- Sat Jan 20, 2018 1:46 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Reversible Processes
- Replies: 2
- Views: 208
Re: Reversible Processes
A reversible process is one where you can go backwards in the process at any time without increasing entropy. This can only happen during an equilibrium.
- Mon Jan 15, 2018 1:38 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: 8.25
- Replies: 1
- Views: 183
8.25
The exercise in question- A constant-volume calorimeter was calibrated by carrying out a reaction known to release 3.50 kJ of heat in 0.200L of solution in the calorimeter, (q=-3.50kJ) resulting in a temperature rise of 7.32C. In a subsequent experiment, 100.0 mL of 0.200 M HBr(aq) and 100.0 mL of 0...
- Sun Jan 14, 2018 9:01 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Work vs. Heat
- Replies: 6
- Views: 447
Re: Work vs. Heat
Work and heat are two different forms of energy transfer. Work is the mechanical transfer of energy while heat is the thermal.
- Sun Jan 14, 2018 8:08 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: living plant
- Replies: 4
- Views: 260
Re: living plant
A dead plant does not transfer heat with its surroundings so it is not an open loop.
- Sun Jan 14, 2018 2:36 pm
- Forum: Calculating Work of Expansion
- Topic: Work equations
- Replies: 3
- Views: 228
Work equations
Can someone please explain what the different work equations are and when you use them? I'm having trouble identifying which to use in the homework.