## Search found 19 matches

Mon Mar 13, 2017 9:13 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Final Exam Winter 2014 Question 2A
Replies: 1
Views: 278

### Re: Final Exam Winter 2014 Question 2A

There is a shift from more gas molecules which means more collision and interaction on the reactants side to the less active right side of the equation. The reaction is spontaneous which means that that deltaG =-#. deltaG=deltaH-tdeltaS. there are more moles on the left than on the right which incre...
Mon Mar 06, 2017 8:50 pm
Forum: *Alkanes
Topic: Tert- Naming
Replies: 2
Views: 435

### Re: Tert- Naming

The only prefixes you ever consider when alphabetizing is "iso", "neo", and "cyclo". Otherwise you do not consider these prefixes in nomenclature. So, text would not count.
Mon Mar 06, 2017 8:46 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Gibbs Free Energy and Temperature
Replies: 1
Views: 376

### Re: Gibbs Free Energy and Temperature

Gibbs free energy gives insight into whether or not the reaction is spontaneous at a certain temperature with the given equation deltaG=deltaH-TdeltaS. If the change in gibbs free energy is negative, then the reaction is spontaneous and will occur at that temperature.
Wed Mar 01, 2017 1:14 pm
Forum: *Electrophiles
Topic: Collision
Replies: 1
Views: 284

### Re: Collision

When nucleophiles collide with electrophiles, the pi bonds are only one of two ways that the electrons can be donated. The other way that electrons can be donated are in the case of lone pairs. Hop ethics helps!
Sun Feb 05, 2017 12:10 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: electrons flow
Replies: 1
Views: 183

### Re: electrons flow

A volt is a measure of the energy potential difference between the left anode and the right cathode. As the current flows from left to right the potential energy decreases because the potential difference between the electrodes decreases, and therefore the voltage decreases with it. Hope this helps!
Sun Jan 29, 2017 9:51 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Purpose of Gibbs Free Energy?
Replies: 1
Views: 294

### Re: Purpose of Gibbs Free Energy?

Gibbs free energy is is "free" because it is a measure of how much energy in a system is readily available to do work. It is used for systems with constant temperature and pressure (isobaric). So, it follows that is the change in Gibb's free energy is negative the reaction is spontaneous. ...
Sun Jan 22, 2017 3:21 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Ideal Gas Equation [ENDORSED]
Replies: 1
Views: 198

### Re: Ideal Gas Equation[ENDORSED]

I believe it is because the gas particles can be considered to be expanding in three dimensions, Cx,Cy, and Cz. When the particle is expanding in three different directions, the gas constant has to multiplied by 1/2 (as per the the equation) and then multiplied by the amount of directions the partic...
Wed Jan 11, 2017 8:29 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Chapter 8.55, Hess's Law
Replies: 4
Views: 514

### Re: Chapter 8.55, Hess's Law

In order for the equation to be balanced, there needs to be the same amount of moles of an element on both the reactant and product side of the equation. In order for the equation to be balanced in regards to the O2, you need to multiply the whole reaction by 3/2 first. Hope that this helps!
Wed Jan 11, 2017 8:26 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Understanding Enthalpy as State Function
Replies: 1
Views: 303

### Re: Understanding Enthalpy as State Function

Hey! Enthalpy is considered a state function because its value only depends upon the initial and final value, the path that the reaction takes does not matter. This is in contrast to work which is not a state function because it is a lot more work to leave point A run 5 miles west, then 6 miles east...
Mon Nov 28, 2016 10:32 am
Forum: Ionic & Covalent Bonds
Topic: H2S and HCl
Replies: 1
Views: 894

### Re: H2S and HCl

The reason has to do with the bent geometry of the H2S molecule as compared to the linear geometry of the HCl. Also, H2S has a higher boiling point than H2S which means that the bond strength is higher and therefore more polar. Hope this helps!
Mon Nov 14, 2016 10:35 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: M.O. Theory Conceptual Basis
Replies: 2
Views: 413

### Re: M.O. Theory Conceptual Basis

Molecular orbital theory comes from the concept of combining the wave functions of an atoms' electron orbitals. When they are in phase, the molecular orbital diagram accounts for this by adding. When they happen to be out of phase the molecular orbital diagram accounts for this as well. The bonding ...
Mon Nov 14, 2016 10:24 am
Forum: Ideal Gases
Topic: Gases
Replies: 1
Views: 257

### Re: Gases

Increasing the temperature of a a gas is increasing the average Kinetic Energy of that gas, therefore the particles are moving faster/vibrating more, allowing for sound to travel through the air at a faster velocity than just 346m/s which is the speed of sound at room temperature.
Mon Nov 14, 2016 10:17 am
Forum: Naming
Topic: Shape
Replies: 2
Views: 299

### Re: Shape

The difference between the two just has to do with the shape of the complex. They both have four ligands attached to a central atom, but the difference is that the one configuration forms a square with all of the ligands in the same plane (square planar) and the other configuration has three of the ...
Fri Nov 04, 2016 1:23 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Order?
Replies: 5
Views: 699

### Re: Bond Order?

What does a non integer bond order signify? For example 1.5? Thanks you for the help!!
Wed Oct 26, 2016 11:05 am
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers and Atomic Orbitals
Replies: 3
Views: 578

### Re: Quantum Numbers and Atomic Orbitals

The quantum number Ms, or spin magnetic quantum number, is either +1/2 or -1/2. If positive the spin is upward and if negative the spin is downward. If the electrons are paired then one will have the quantum number Ms +1/2 and the second will have the quantum number -1/2. If they are parallel howeve...
Wed Oct 19, 2016 9:26 pm
Forum: Octet Exceptions
Topic: Homework 3.57 part b [ENDORSED]
Replies: 4
Views: 596

### Re: Homework 3.57 part b[ENDORSED]

Pretty sure that the hydrogen is bonded to the oxygen atom in the lewis structure because the formal charge of S would be +1 if the hydrogen were bonded to it, making it less stable.
Tue Oct 11, 2016 11:22 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Potassium and Calcium
Replies: 2
Views: 445

### Re: Potassium and Calcium

Potassium and Calcium are in the s block of the periodic table and come before the 3d block, therefore K would have the configuration: [AR]4s^1. Calcium would have the configuration [Ar] 4s^2. After element 20, you get into the 3d block, so you would have to put 3d^n (n being 1-10) before the 4s ene...
Thu Oct 06, 2016 10:22 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodes and Nodal Planes [ENDORSED]
Replies: 3
Views: 654

### Re: Nodes and Nodal Planes[ENDORSED]

It would have two nodes. One radial and one angular. Nodes are the places in the orbital structure where there is no electron density. An angular node is completely flat plane. A radial node is the shape of donut.
Fri Sep 30, 2016 12:42 am
Forum: Student Social/Study Group
Topic: Hedrick Summit Study Group Chem 14A
Replies: 29
Views: 3074

### Re: Hedrick Summit Study Group Chem 14A

I would love to join the group at the top of the hill! Or is anyone down to start a Hedrick study group? Maybe get a little competition going?

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