## Search found 32 matches

Mon Mar 12, 2018 11:58 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Functional Groups
Replies: 7
Views: 718

### 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: 183

### 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: 449

### 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: 462

### Re: Equation variations

You can aso use this equation for first order:

[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: 439

### 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: 379

### 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: 227

### 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: 189

### 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: 135

### 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: 140

### 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: 299

### 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: 305

### 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: 189

### 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: 146

### 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: 110

### 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: 172

### 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: 1284

### 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: 190

### 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: 152

### 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
Replies: 2
Views: 170

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: 269

### 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: 463

### 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: 164

### 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: 239

### 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: 219

### 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: 94

### 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: 6
Views: 343

### 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: 153

### 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: 135

### 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: 316

### 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: 201

### 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: 185

### 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.