## Search found 22 matches

Sat Mar 12, 2016 1:27 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 2012 Final Q3A
Replies: 1
Views: 267

### 2012 Final Q3A

In this question, we were asked to draw and label the galvanic cell of 0.0080M CrCl3 and 0.12M CuSO4 with a piece of copper wire and a chrome-plated piece of metal. How do we determine which one is the anode and cathode?
Sun Mar 06, 2016 10:45 pm
Forum: *Cyclopropanes and Cyclobutanes
Topic: Bond Angle Strain vs. Torsional Strain
Replies: 8
Views: 1205

### Re: Bond Angle Strain vs. Torsional Strain

Does all eclipsed molecules have torsional strain?
Sun Feb 28, 2016 11:31 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Double Dagger
Replies: 1
Views: 896

### Double Dagger

What does the double dagger (‡) mean and what is its significance?
Sun Feb 21, 2016 10:20 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Friedal-Crafts Alkylation
Replies: 1
Views: 245

### Friedal-Crafts Alkylation

Can someone explain the thought process of determining which bonds are broken and why in the first step of a Friedal-Crafts alkylation?
Sun Feb 14, 2016 5:40 pm
Forum: First Order Reactions
Topic: Textbook 15.23 Part A
Replies: 1
Views: 265

### Textbook 15.23 Part A

Determine the rate constant for each of the following first-order reactions, in each case expressed for the rate of loss of A: (a) A -> B, given that the concentration of A decreases to one-half its initial value in 1000. s. In discussion, my TA used the formula 1/2[A]=[A]e^-kt. How do we know to pu...
Sun Feb 07, 2016 5:40 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Winter 2011 Midterm #7&8 part C
Replies: 1
Views: 248

### Winter 2011 Midterm #7&8 part C

In the Winter 2011 midterm, #7&8 part c asks what is Keq and the change in free energy at 25 degrees C. They use the equation logKeq=nE/0.0592V. Can someone explain to me how to get this formula?
Sun Jan 31, 2016 10:41 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Nonlabile and Inert substances
Replies: 1
Views: 280

### Nonlabile and Inert substances

I understand that nonlabile and inert substances are substances that are unstable but survive for long periods, but can someone explain to me why and how they're able to survive for a long time?
Sat Jan 23, 2016 5:04 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Homework problem 8.59
Replies: 5
Views: 802

### Homework problem 8.59

Use the data provided in Appendix 2A to calculate the standard reaction enthalpy for the reaction of pure nitric acid with hydrazine: 4HNO3(l) + 5N2H4(l) -> 7N2(g) + 12H2O(l) For this problem, I understand that we add all the standard enthalpies of formation for the products minus the standard entha...
Sat Jan 23, 2016 2:27 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Homework Question 8.25
Replies: 3
Views: 502

### Re: Homework Question 8.25

I had a question regarding the temperature in this problem. In the solutions manual, it just used the temperatures they gave us (7.32C and 2.49C) and changed the unit to K. I was just wondering why we wouldn't have to convert the temperature to K and why we can just change the unit like that?
Sun Jan 17, 2016 11:34 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isothermal
Replies: 1
Views: 277

### Isothermal

If the temperature in an isothermal reaction is held constant, how can there still be heat exchange?
Mon Jan 11, 2016 1:05 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Vibrational Energy
Replies: 1
Views: 278

### Vibrational Energy

Why is vibrational contribution to the internal energy insignificant at ordinary temperatures compared to translational and rotational?
Thu Dec 03, 2015 10:52 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 2012 Final #6B
Replies: 3
Views: 497

### 2012 Final #6B

The question is: The equilibrium constant, Kc, equals 0,045 at 250C for the decomposition reaction: PCl5 (g) <=> PCl3 (g) + Cl2 (g). Calculate the percentage of PCl5 that dissociates if 0.05 mole of PCl5 is placed in a closed vessel (constant volume) at 250C and 2.00 atm pressure. In the solutions, ...
Sun Nov 29, 2015 2:57 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted and Arrhenius Acids/Bases
Replies: 1
Views: 491

### Bronsted and Arrhenius Acids/Bases

What is the difference between Bronsted and Arrhenius acids and bases?
Thu Nov 19, 2015 1:22 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: CO3 2- (carbonato)
Replies: 2
Views: 1521

### CO3 2- (carbonato)

Why can carbonato be monodentate or bidentate?
Thu Nov 12, 2015 1:42 am
Forum: Naming
Topic: Finding the charge
Replies: 2
Views: 261

### Finding the charge

In example 17.1 in the textbook, the problem asks you to name the coordination compound [Co(NH3)3(OH2)3]2 (SO4)3. It shows that the cation complex, [Co(NH3)3(OH2)3]2, has a charge of +3, but I don't understand how they got that.
Tue Nov 03, 2015 11:51 pm
Forum: Hybridization
Topic: Fall 2014 Midterm #8
Replies: 1
Views: 290

### Fall 2014 Midterm #8

The question is: Consider the bonding in: CH2=CHCHO. Identify the composition of each bond and the hybridization of each lone pair. For the double bonds, why is the composition of the pi bond different from the sigma bond? For example, for the double bond between two C atoms, the sigma bond is (C2sp...
Wed Oct 28, 2015 10:28 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent and Ionic Bonds
Replies: 2
Views: 394

### Covalent and Ionic Bonds

How do you determine whether a bond is covalent or ionic? If it's a covalent bond, how do you determine whether a bond is a polar covalent bond or a nonpolar covalent bond?
Wed Oct 28, 2015 12:39 am
Forum: Bond Lengths & Energies
Topic: Calculating bond length
Replies: 1
Views: 313

### Calculating bond length

How would you calculate the bond length for a molecule that has multiple different bond orders and for molecules that have resonance?
Fri Oct 23, 2015 2:43 am
Forum: Determining Molecular Shape (VSEPR)
Topic: CF2CL2
Replies: 1
Views: 1180

### CF2CL2

For CF2Cl2, why is the bond angle slightly larger than 109.5 degrees making it slightly polar? Since it's a tetrahedral, shouldn't it be 109.5 degrees?
Wed Oct 14, 2015 7:57 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Fall 2014 Quiz 1 Preparation
Replies: 3
Views: 422

### Fall 2014 Quiz 1 Preparation

I'm struggling with #10 on the Fall 2014 Quiz 1 Preparation in the workbook. The answers at the end says to use the Bohr equation, but I don't really understand the work shown with it. Can someone clarify it for me?
Thu Oct 08, 2015 2:35 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity and Electronaffinity
Replies: 1
Views: 326

### Electronegativity and Electronaffinity

What is electronegativity and electron affinity? Why does it increase when you go from bottom to top and left to right on the periodic table?
Sat Oct 03, 2015 1:35 am
Forum: Photoelectric Effect
Topic: Problem 1.33 part c
Replies: 1
Views: 362

### Problem 1.33 part c

I was able to do part a and b of 1.33 in the textbook, but I'm completely stumped on part c) What is the wavelength of the radiation that caused photoejection of the electron? Thank you!

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