## Search found 11 matches

Thu Mar 16, 2017 3:28 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Winter 2015 Final Q1-D
Replies: 1
Views: 315

### Winter 2015 Final Q1-D

For this question, it tells you that eating 5 g of bread provides 2000kcal of energy. It asks to calculate the temperature that the calorimeter is raised when the 5g is burned inside it. For the answer, the 5 g was not used in the calculations. Is this because the amount is already implicit in the h...
Fri Mar 10, 2017 10:49 am
Forum: *Cycloalkenes
Topic: 1.21 a b and c
Replies: 3
Views: 722

### Re: 1.21 a b and c

For part C, is it acceptable to start numbering at the top left before the double bond? It gives nearly the same answer, and since the priority for lower numbers is for the double bonds I would think that the locations of the methyl groups would not matter. The name I got was 3-isopropyl-4,5 dimethy...
Sun Mar 05, 2017 4:18 pm
Topic: Page 152 of organic textbook
Replies: 2
Views: 526

### Page 152 of organic textbook

I am a little confused on the electrophilic addition of hydrogen bromide, HBr, to propene, CH3CHCH2, producing 2-bromopropane, CH3CHBrCH3. I don't understand why the 2nd carbon gets a partial positive charge. I also don't get how we know which carbon the H from the HBr gets bonded to. Could someone ...
Sun Feb 26, 2017 6:41 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Determining k vs k'
Replies: 3
Views: 342

### Determining k vs k'

Does it matter which rate constant you assign to be k and which one you assign to be k'? If so, how do you tell the difference?
Sun Feb 19, 2017 11:42 pm
Forum: Zero Order Reactions
Topic: Homework Question
Replies: 4
Views: 544

### Re: Homework Question

So does the fact that it is a second order elementary reaction mean that you have added up the powers to get an overall reaction order of two?
Wed Feb 08, 2017 8:56 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: 14.41
Replies: 4
Views: 512

### 14.41

For this question we are asked to calculate E for a concentration cell involving H2 and H+. I split it up into half reactions using 2H+ and H2, but the solutions say that n=1. Wouldn't there be an electron transfer of two in the balanced equations?
Sun Feb 05, 2017 10:59 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Example 14.8
Replies: 2
Views: 326

### Example 14.8

In example 14.8 for calculating the equilibrium constant, the book finds the two reduction half-reactions and chooses to reverse one of them to act as the oxidation half reaction. Do they just randomly pick which one to reverse, or does it have something to do with the standard cell potential values...
Sat Jan 28, 2017 6:44 pm
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: HW 9.75
Replies: 1
Views: 262

### HW 9.75

I am confused on how to determine how many different orientations the cis and trans compounds will have. Can anyone explain?
Sat Jan 28, 2017 6:33 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 9.13
Replies: 5
Views: 588

### Re: 9.13

Why can't you use the heat capacity in calculating the change in entropy for the temperature increase? Wouldn't the heat capacity be (5/2)R because it is an ideal gas? The solutions manual only uses nRln(T2/T1) and I thought it would make sense to use nCln(T2/T1).
Fri Jan 20, 2017 6:02 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Chapter 8, Problem 61
Replies: 5
Views: 631

### Re: Chapter 8, Problem 61

Why can't you just take the -92.22 from the second equation and divide it by three in order to get H2, which would match the final equation?
Sun Jan 15, 2017 2:13 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question 8.25
Replies: 1
Views: 244

### Question 8.25

In the question, it tells you that the temperature rose by 7.32 C, but in the solutions manual they put 7.32 K into the equation to solve for the heat capacity. Why don't you have to convert it to K? How can you tell when conversion is necessary and when it is not?

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