Search found 22 matches
Re: Angles
The way you draw the structure would matter if there were a double bond. You would need to draw it so that the highest priority groups are in the designated Z/E position.
- Sun Mar 06, 2016 1:59 am
- Forum: *Alkanes
- Topic: Naming is Confusing
- Replies: 1
- Views: 523
Re: Naming is Confusing
I don't think atomic number has anything to do with naming? It is always alphabetical. You might be thinking about E/Z geometric isomers in which you decide the what your priority groups are depending on the part that has the highest atomic number on each carbon.
- Sat Feb 27, 2016 5:44 pm
- Forum: *Organic Reaction Mechanisms in General
- Topic: Psuedo-Equilibrium Constant
- Replies: 1
- Views: 382
Psuedo-Equilibrium Constant
Is it possible to obtain the actual equilibrium constant from the pseudo-equilibrium constant obtained through the activated complex? What does this reveal about the reaction? Would delta G of the exergonic reaction be negative with a large K‡?
- Fri Feb 19, 2016 12:05 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Unit of rate constant
- Replies: 2
- Views: 2020
Re: Unit of rate constant
You would have to derive it depending on what order your reaction is. You can either cancel out units when solving for the rate constant or you can just memorize it. For a zero order reaction, the rate constant unit is M/s. For a first order reaction, the rate constant unit is 1/s. For a second orde...
- Tue Feb 09, 2016 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
- Topic: Avogadro's Number and Residual Entropy
- Replies: 1
- Views: 590
Avogadro's Number and Residual Entropy
When do you need to multiple the equation, S = Kbln(W) by avogadro's number? For example, in the 2012 midterm, on question 3A, you don't need to. Is this because it is asking for the residual entropy for the entire molecule?
- Fri Feb 05, 2016 7:42 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing Redox Rxn in Basic Solution
- Replies: 1
- Views: 465
Re: Balancing Redox Rxn in Basic Solution
In a basic solution, there should be OH- present instead of H+ ions. Therefore, you would balance the half reaction the same way as you would in an acidic solution. Then, you would have to add as much OH- to both sides of the equation as you would need in order to cancel out the H+ if it is still pr...
- Tue Jan 26, 2016 12:39 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Different Values for G of Formation
- Replies: 1
- Views: 364
Different Values for G of Formation
There are multiple ways of calculating delta G for a reaction. For example, products minus reactants versus delta h minus temperature times delta H. Sometimes the values that I get are vastly different (for example: -753.01 kJ/mol vs. -713.02 kJ./mol). Is there a correct way to calculate it in this ...
- Sun Jan 24, 2016 8:55 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Increasing Entropy
- Replies: 1
- Views: 999
Re: Increasing Entropy
The entropy of container A has more entropy because of its monatomic gas, meaning that there are more particles in the container versus a container with diatomic gas. With more particles, there is more disorder.
- Mon Jan 18, 2016 3:54 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Homework Problem 8.53, Different Equation for Q value
- Replies: 1
- Views: 542
Homework Problem 8.53, Different Equation for Q value
On this problem, how do you know to use q = -CdeltaT instead of the regular q=mcdeltaT equation?
- Sun Jan 17, 2016 9:19 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: 3/2 and 5/2 R
- Replies: 5
- Views: 2440
Re: 3/2 and 5/2 R
If the ideal gas is at constant volume then you use 3/2R and if the ideal gas is at constant pressure then you use 5/2R.
- Fri Jan 08, 2016 9:35 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Constant Volume and Pressure
- Replies: 1
- Views: 396
Constant Volume and Pressure
Does a calorimeter with a constant volume vs. a calorimeter with a constant pressure result in different heat capacities? Does a coffee cup calorimeter or bomb calorimeter both take into account constant pressure/volume?
- Tue Dec 01, 2015 8:51 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Electronegativity in Strength of Acids
- Replies: 1
- Views: 453
Electronegativity in Strength of Acids
I understand that elements with a higher electronegativity pull the electrons closer, making it easier for the hydrogen to dissociate; however, why is HF a weak acid if fluorine is the most electronegative element? What is more important in determining the comparative strength of acids, bond strengt...
- Thu Nov 26, 2015 1:32 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Solids and Water Vapor
- Replies: 2
- Views: 1556
Solids and Water Vapor
How do adding solids affect equilibrium? Does Le Chatelier's principle only pertain to concentration or does it also include pressure? Is the pressure of water vapor ever changed?
- Fri Nov 20, 2015 9:25 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T-Shaped Molecule and its Dipole Moments
- Replies: 3
- Views: 3501
Re: T-Shaped Molecule and its Dipole Moments
Then why is an AX2E3 structure 180 degrees and linear?
- Thu Nov 19, 2015 8:17 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T-Shaped Molecule and its Dipole Moments
- Replies: 3
- Views: 3501
T-Shaped Molecule and its Dipole Moments
Do t-shaped molecule's dipole moments cancel out? Also, when you remove lone pairs from a trigonal bipyramidal shaped molecule or 3 from an octahedral shaped molecule, is the t-shape the same? Are the angles both 180 and 90 or is it distorted due to the presence of the lone pairs?
- Fri Nov 13, 2015 5:20 pm
- Forum: Lewis Acids & Bases
- Topic: Strong acids/bases
- Replies: 3
- Views: 979
Re: Strong acids/bases
Yes, you would have to memorize them. There are quite a few, but if you work through enough problems they should get familiar. Strong acids would be HI, HNO 3 , HCl, HBr, HIO 3 , HClO 4 , HClO , and H 2 SO 4 . The rest are usually weak, especially if you see that it is an organic compound such as ac...
- Tue Nov 03, 2015 6:01 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order
- Replies: 5
- Views: 2601
Re: Bond Order
Hi Michelle, I was wondering that too. Does a 1.5 bond order number mean that a molecule has resonance, thus contributing to a more stable structure? Therefore, would a 1.5 bond order mean that it is more stable than a bond order of 1 since its resonance contributes to its stability? I know I just a...
- Fri Oct 30, 2015 7:15 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Can individual atoms be ligands?
- Replies: 3
- Views: 699
Re: Can individual atoms be ligands?
Yes, I believe the chlorine would be a ligand in this case. A ligand is just an ion or molecule attached to a metal atom to form a complex by coordination bonding and if its in the brackets, that means it is in the coordination sphere.
- Sat Oct 24, 2015 3:58 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Seesaw Bond Angles
- Replies: 6
- Views: 16114
Seesaw Bond Angles
I know that for a seesaw shape, it originates from the trigonal bipyramidal shape. Where do you put the lone pair and why? Also, does this affect the bond angles for seesaw, because my TA said it would still be 90 degrees and 120 degrees?
- Fri Oct 16, 2015 3:16 am
- Forum: Resonance Structures
- Topic: Stability in Resonance Structures
- Replies: 1
- Views: 515
Stability in Resonance Structures
I was wondering what makes resonance structures more stable than molecules without resonance? What are some ways that researchers have used the stability of resonance structures to their advantage?
- Thu Oct 08, 2015 10:36 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg Equation
- Replies: 2
- Views: 608
Rydberg Equation
After using the equation E = -hR/n^2 to obtain the energy that is released when an electron transitions from the different energy levels, I was wondering if I could then use that same energy into the E=hv equation. Is delta E different in this case? This question pertains to the Quiz Preparation Pro...
- Thu Oct 01, 2015 1:56 am
- Forum: DeBroglie Equation
- Topic: Cutoff to Determine Wavelike Properties
- Replies: 2
- Views: 675
Cutoff to Determine Wavelike Properties
Hello, In class, I know we looked at different examples using the De Broglie wavelength equation and I understand that it occurs with a small mass and high velocity. What is the cutoff is between something having wavelengths that could be experimentally detected in a lab and not? Why is this importa...