## Search found 26 matches

Thu Mar 10, 2016 2:43 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: entropy
Replies: 1
Views: 339

### entropy

Why would NO have a higher residual entropy then BF3 at 0K. And is residual entropy different than just saying entropy?
Sat Feb 27, 2016 1:09 pm
Forum: *Alkynes
Topic: Tripple bond line structure
Replies: 2
Views: 1095

### Tripple bond line structure

Why, when drawing the line structure for a molecule with a triple bond it is straight while when you have single or double bonds the lines go in peaks?
Sat Feb 13, 2016 10:42 am
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 HW
Replies: 1
Views: 312

### Quiz 2 HW

Up to what homework problem in ch 15 should we be able to do to be ready for quiz 2?
Wed Feb 10, 2016 3:05 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: fossil fuels
Replies: 2
Views: 377

### Re: fossil fuels

Thank you that makes sense!!
Wed Feb 10, 2016 1:29 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: fossil fuels
Replies: 2
Views: 377

### fossil fuels

The corse reader says to understand the impact of burning fossil fuels, and the use of alternative fuels. can someone please explain this to me.
Mon Feb 01, 2016 2:41 pm
Forum: Balancing Redox Reactions
Topic: oxidizing agent
Replies: 1
Views: 245

### oxidizing agent

How do you know what the oxidizing agent and reducing agent are?
Sun Jan 31, 2016 2:34 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Finding Gibs free energy
Replies: 1
Views: 373

### Finding Gibs free energy

In problem 77b in ch 11 it asks whether a reaction will shift toward products or reactants with an increase in temp. To figure this out you have to see if the reaction is endothermic or exothermic. How can you tell whether the reaction X2(g)<-->2X(g) is endothermic? (it tells you X is a halogen)
Thu Jan 21, 2016 5:06 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: what is Kb
Replies: 1
Views: 339

### what is Kb

In S=KblnW. What is Kb?
Thu Jan 21, 2016 4:23 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: total entropy change
Replies: 1
Views: 639

### total entropy change

In problem 5 in ch 9 it asks you to find the total entropy change of a process in which 40.0 kJ of energy is transferred as heat from a large reservoir at 800K to one at 200K. In the solutions manual it finds the change in entropy for both then adds them together. what I don't understand is it first...
Sat Jan 16, 2016 1:48 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: q=Csp(delta T)
Replies: 1
Views: 753

### q=Csp(delta T)

We learned the equation q= specific heat x change in Temperature (q=C(delta T)). We also learned q=gxCx(delta T). When do you use each one? Why do you sometimes put the grams in the equation and sometimes not?
Sun Jan 10, 2016 6:38 pm
Forum: Phase Changes & Related Calculations
Topic: Isolated systems
Replies: 3
Views: 452

### Isolated systems

Ch 8.1 asks whether a bomb calorimeter in which benzene is burned is a open, closed or isolated system. I said it was an open system but the answering manual says it is isolated. Why would it be and isolated system?
Sat Dec 05, 2015 3:10 pm
Forum: Identifying Acidic & Basic Salts
Topic: solubility of ionic compounds in water
Replies: 2
Views: 393

### Re: solubility of ionic compounds in water

This information can be found in the corse reader on page 153, right before aqueous equilibria is discussed.
Sat Dec 05, 2015 10:13 am
Forum: Identifying Acidic & Basic Salts
Topic: solubility of ionic compounds in water
Replies: 2
Views: 393

### solubility of ionic compounds in water

Do we need to memorize the page about useful guidelines for predicting the solubility of ionic compounds in water for our final?
Sun Nov 29, 2015 9:13 pm
Forum: Polyprotic Acids & Bases
Topic: loosing an h+ for a negative ion
Replies: 1
Views: 346

### loosing an h+ for a negative ion

For Polyprotic acids and bases, why is it harder to lose H+ from a negatively charged ion?
Sun Nov 22, 2015 8:55 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: new initial for an ICE box
Replies: 1
Views: 300

### new initial for an ICE box

Problem 11.67 I could not figure out how to solve using a normal ICE box so I looked at the solutions manual, they solved it with and ICE box but they added a new initial to the ice box. I understand where they got the original because they were given in the problem but I do not understand how they ...
Mon Nov 16, 2015 1:32 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Figuring out if a molecule is polydentate
Replies: 1
Views: 357

### Figuring out if a molecule is polydentate

When figuring out weather a molecule is monodentate or bidentate I understand you have to figure out how many ligands can attach. Because of this you have to look at the lone pairs. For example CO3 has three Oxygen molecules each with at least one lone pair so I would think this means it could be tr...
Mon Nov 16, 2015 1:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination number
Replies: 1
Views: 501

### Coordination number

I understand that the coordination number is the number of bonds. When calculating the coordination number do you count the double bonds?
Mon Nov 09, 2015 7:41 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: When to use P in finding K and Q
Replies: 1
Views: 420

### When to use P in finding K and Q

Many of the Homework problems form chapter 11 ask us to write the equilibrium expression K for reactions or write the reaction quotient Q. In the answers to these problems sometimes they are written using P and sometimes they are not. When do we use P and when do we not? For example problem number 1...
Mon Nov 09, 2015 7:32 pm
Forum: Naming
Topic: Order of Ligands in naming Coordination Compounds
Replies: 1
Views: 294

### Order of Ligands in naming Coordination Compounds

When writing the names of Coordination Compounds you write the Ligands in alphabetical order. My question is do you alphabetize the ligands before or after you add the prefixes (mono-, Di-, Tri-...)?
Sat Oct 31, 2015 5:03 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: What order do you fill bonds?
Replies: 3
Views: 498

### Re: What order do you fill bonds?

Thanks guys!
Sat Oct 31, 2015 10:57 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: What order do you fill bonds?
Replies: 3
Views: 498

### What order do you fill bonds?

When drawing out a MO diagram when you are filling the slots for bonds down the center of the diagram do you completely fill (sigma p z) before you put a electron in (pi p x) or do you put one electron in (sigma p z) then one in (pi p x) then one in (pi p y) then you fill (sigma p z)?
Sat Oct 31, 2015 10:45 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO theory, how do we know Z?
Replies: 2
Views: 410

### MO theory, how do we know Z?

I realize that when Z<8 the MO diagram is slightly different. How do we know when Z<8? Like for example for Li2 is Z<8? Also for heteronuclear molocules do we use the diagram for Z<8? Thanks!
Mon Oct 26, 2015 1:20 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Character
Replies: 2
Views: 462

### Re: Ionic Character

Thanks Orly :)
Sat Oct 24, 2015 1:31 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Character
Replies: 2
Views: 462

### Ionic Character

In chapter 3 problem 77 part (c) it asks us to determine whether CO2 or CS2 has a greater ionic character. I understand that a greater ionic character just means that the electronegativity difference is greater. Because of this I said that CS2 would have the higher ionic character because based on t...
Sat Oct 10, 2015 3:17 pm
Forum: Administrative Questions and Class Announcements
Topic: Do we need to have figure 1.9 and 1.10 memorized?
Replies: 1
Views: 340

### Do we need to have figure 1.9 and 1.10 memorized?

For a few of the chapter 1 homework problems you found out a wavelength and then they asked you what series (Balmer or Lyman) that wavelength was in. To answer this I had to look back on figure 1.10 in the textbook. Should we fave the wavelengths of the Balmer and Lyman series memorized for the quiz...
Sat Oct 03, 2015 8:47 am
Forum: Properties of Electrons
Topic: How do I know which formula to use to find photons?
Replies: 2
Views: 615

### Re: How do I know which formula to use to find photons?

To figure out the energy given off by a sodium atom when it generates a photon you use the formula: E=hc/λ. This equation comes from a combination of λν = c and E = hν. You use a combination of these equations because in the problem you are not given the frequency(v) so you can not simply use E = hv...