Search found 42 matches

by VictoriaRoderick_3A
Thu Mar 10, 2016 10:37 pm
Forum: *Electrophilic Addition
Topic: The Number of Intermediates for Electrophilic Addition
Replies: 3
Views: 344

Re: The Number of Intermediates for Electrophilic Addition

Dr. Lavelle said that anything between the reactant and product is considered an intermediate. That is how I approach it.
by VictoriaRoderick_3A
Sun Mar 06, 2016 6:36 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Cis and trans in line structures
Replies: 1
Views: 312

Re: Cis and trans in line structures

Take the page and turn it slightly to the right. From the carbon-carbon double bond, there a C and H on the same side. The C has higher priority than H, making is trans- or E-.
by VictoriaRoderick_3A
Sun Mar 06, 2016 6:31 pm
Forum: General Science Questions
Topic: Ketones
Replies: 1
Views: 602

Re: Ketones

I believe so. The different endings are only because of the functional groups for each molecule, and the numbers in the middle of the parent chain represent the location of single/double bonds.
by VictoriaRoderick_3A
Sun Mar 06, 2016 6:29 pm
Forum: *Alkynes
Topic: Naming
Replies: 3
Views: 634

Re: Naming

Start with the parent chain and then focus on the number of bonds, functional groups, and substituents.

Remember to keep the numbers as low as possible!
by VictoriaRoderick_3A
Sun Mar 06, 2016 6:27 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Torsional & Steric Strain
Replies: 2
Views: 412

Re: Torsional & Steric Strain

Torsional strain is developed from the electron activity surrounding each atom. When the molecule is eclipsed, the electrons are being forced together, and they naturally repel. Steric strain is developed from physical interactions. This is when the actual atoms are hitting each other due to the clo...
by VictoriaRoderick_3A
Thu Mar 03, 2016 11:05 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: The A in the Arrhenius Equation
Replies: 1
Views: 227

Re: The A in the Arrhenius Equation

Once the equation is written out, they should cancel out. I believe there is an example in the course reader.
by VictoriaRoderick_3A
Thu Mar 03, 2016 11:04 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts in relation to Graph Peaks
Replies: 2
Views: 300

Re: Catalysts in relation to Graph Peaks

When a catalyst is present, there is a lower activation energy because the reaction is sped up.
by VictoriaRoderick_3A
Thu Mar 03, 2016 9:32 am
Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Topic: Iso and neo vs. sec and tert
Replies: 2
Views: 412

Re: Iso and neo vs. sec and tert

For sec- the center carbon should be attached to two other carbons as well.
by VictoriaRoderick_3A
Thu Mar 03, 2016 9:29 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: How to solve with K without an A value?
Replies: 3
Views: 394

Re: How to solve with K without an A value?

When you write out the division problem, the A's should cancel out.
by VictoriaRoderick_3A
Thu Mar 03, 2016 9:28 am
Forum: *Organic Reaction Mechanisms in General
Topic: Which carbon in a double bond does the electrophile bond to
Replies: 3
Views: 323

Re: Which carbon in a double bond does the electrophile bond

As long the molecule is symmetrical, you can attach it to the either carbon. The halogen then attaches to the carbocation.
by VictoriaRoderick_3A
Sun Feb 21, 2016 7:06 pm
Forum: *Nucleophiles
Topic: Nucleophile Example in the OTextbook
Replies: 1
Views: 309

Re: Nucleophile Example in the OTextbook

Nucleophiles meet these standards:
1) Negative Charge
2) Double Bonds (such as the hydrocarbon mentioned)
3) Extra lone pairs
by VictoriaRoderick_3A
Sun Feb 21, 2016 6:57 pm
Forum: *Nucleophiles
Topic: Intermediate Line
Replies: 2
Views: 300

Re: Intermediate Line

The line has to be even with the reactants because is the reference point. Think of it as sea level. Anything higher has a positive change, and anything below has a negative change.
by VictoriaRoderick_3A
Mon Feb 15, 2016 9:59 pm
Forum: General Rate Laws
Topic: graphing reactions
Replies: 2
Views: 349

Re: graphing reactions

Correction:

2nd Order is 1/[conc]
by VictoriaRoderick_3A
Mon Feb 15, 2016 2:53 pm
Forum: General Rate Laws
Topic: graphing reactions
Replies: 2
Views: 349

Re: graphing reactions

That depends on the order.

You use ln[conc] for first order.

You use 1/ln[conc] for second order

You use [conc] for zero order.
by VictoriaRoderick_3A
Thu Feb 11, 2016 10:43 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Salt Bridge
Replies: 5
Views: 686

Re: Salt Bridge

I was under the impression that they were necessary. I have not seen an example that does not include one. The salt does not affect the reaction, and it prevents electron build up (as mentioned above).
by VictoriaRoderick_3A
Sun Feb 07, 2016 10:33 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Ideal Gases
Replies: 1
Views: 294

Re: Ideal Gases

These are how you calculate the heat capacity of ideal gases.

You use the 3/2R equation for monatomic gases.

You use the 5/2R equation for diatomic gases.
by VictoriaRoderick_3A
Sun Feb 07, 2016 10:31 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Difference in values of Gibbs Free Energy
Replies: 2
Views: 1013

Re: Difference in values of Gibbs Free Energy

I believe it is because H2 is the natural state of Hydrogen, while Br2 is not the natural state of Bromine.
by VictoriaRoderick_3A
Thu Feb 04, 2016 8:28 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox Reactions with e-
Replies: 1
Views: 213

Balancing Redox Reactions with e-

How do you know how many electrons to add?
by VictoriaRoderick_3A
Fri Jan 29, 2016 3:04 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Max Potential
Replies: 1
Views: 218

Max Potential

How do you calculate the max potential of cells? Why is the concept important?
by VictoriaRoderick_3A
Thu Jan 21, 2016 9:17 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: value of n in w= -nRT*ln(V2/V1) vs. q=nCΔT
Replies: 2
Views: 894

Re: value of n in w= -nRT*ln(V2/V1) vs. q=nCΔT

I believe this is the case simply because you are given the values to solve for n.
by VictoriaRoderick_3A
Thu Jan 21, 2016 9:15 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Internal Energy
Replies: 2
Views: 384

Re: Internal Energy

The change of internal energy does not depend on how the system got to the initial or final state.
by VictoriaRoderick_3A
Thu Jan 21, 2016 9:09 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Molar Heat Capacity Formula of Cp and Cv
Replies: 2
Views: 657

Molar Heat Capacity Formula of Cp and Cv

I was just wondering if there were different equations for when the pressure is constant and volume is constant. Or do you use the same equation?

Thank You.
by VictoriaRoderick_3A
Wed Jan 13, 2016 9:34 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Rationale for higher heat capacity
Replies: 1
Views: 251

Re: Rationale for higher heat capacity

The molar heat capacity higher when the molecule is more complicated. The more bonds a molecule has the more vibrational movements and rotation movements the molecule has. This means that it requires more energy to be raised one degree celsius since the energy is being used in multiple bonds.
by VictoriaRoderick_3A
Fri Jan 08, 2016 5:52 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law, Chapter 8 HW
Replies: 1
Views: 215

Hess's Law, Chapter 8 HW

My question is in regards to the chapter 8 homework question 61.

When cancelling the out various components to the reactions, can you cancel any products from any reactants or does it have to be the continuing reaction.

For 61, can I cancel the 2NH4Br in the first and last equation?

Thank you.
by VictoriaRoderick_3A
Mon Nov 23, 2015 9:29 pm
Forum: Lewis Acids & Bases
Topic: Lewis vs Bronsted Acids
Replies: 3
Views: 598

Lewis vs Bronsted Acids

How can you tell whether an acid is a Lewis or Bronsted acid? Does it have anything to do with whether the acid is a product or reactant?

I'm really confused on determining this.

Thank you,
Victoria
by VictoriaRoderick_3A
Thu Nov 19, 2015 12:58 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Chemical Equilibrium #11.63 and Quiz #10 Video
Replies: 2
Views: 542

Re: Chemical Equilibrium #11.63 and Quiz #10 Video

I am pretty sure this is for the second quiz in our green book.
by VictoriaRoderick_3A
Fri Nov 13, 2015 11:28 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Determining the Coordination Number
Replies: 2
Views: 268

Determining the Coordination Number

How do you determine the coordination number of a central metal ion?
by VictoriaRoderick_3A
Wed Nov 11, 2015 3:33 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Fall 2014 Quiz 3 #8
Replies: 1
Views: 243

Fall 2014 Quiz 3 #8

This is the question... Consider the following reaction: NH_{4}HS (s)\rightarrow NH_{3} (g) + H_{2}S (g) If the value of Kp os 0.11 atm^{2} at 300 K, calculate the equilibrium partial pressure of NH_{3} (g) starting from pure NH_{4}HS (s) . I don't know how to approac...
by VictoriaRoderick_3A
Mon Nov 09, 2015 9:55 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 8
Views: 708

Re: Polydentate

HN(CH_{2}CH_{2}NH{2})_{2} would be polydentate, more specifically tridentate. Each of the three nitrogens has a lone pair, so those can be replaced by a bond. CO_{3} 2- can be either mono- or polydentate; however, it is more often monodentate. Remember that the molecular shape is trigonal p...
by VictoriaRoderick_3A
Mon Nov 09, 2015 9:41 am
Forum: Naming
Topic: Chelating Ligands
Replies: 1
Views: 223

Re: Chelating Ligands

A chelate is a complex containing a ligand that forms a ring of atoms that includes the central metal atom. This is directly from the course reader on page 104.

A chelate is a closed loop, so it must have at least two ligating atoms.
by VictoriaRoderick_3A
Sun Nov 01, 2015 10:53 am
Forum: General Science Questions
Topic: General Question about MO Diagrams
Replies: 2
Views: 984

Re: General Question about MO Diagrams

I would draw them all just to avoid any confusion. Also, it would be easier for the graders to find partial points to give you.

I did hear that if it ask for all four, you are REQUIRED to do all four.
by VictoriaRoderick_3A
Sun Nov 01, 2015 10:52 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Molecular Orbital Theory when nuclear charge is less than 8
Replies: 1
Views: 186

Re: Molecular Orbital Theory when nuclear charge is less tha

It takes more energy for them pair in a sigma bond than a pi bond, in this case.
by VictoriaRoderick_3A
Sat Oct 24, 2015 3:03 pm
Forum: Hybridization
Topic: Quiz 2 Preperation #1 (Fall 2013)
Replies: 2
Views: 300

Quiz 2 Preperation #1 (Fall 2013)

After I did the Lewis Structure, I got , but the answer was just ? Why is this? Should their be a 2 because it is in period 2?
by VictoriaRoderick_3A
Sat Oct 24, 2015 2:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Homework Question 4.1
Replies: 1
Views: 196

Homework Question 4.1

For question 4.1 there is a linear molecule with an angle of 180 degrees. There question asks if there must be, may be, or cannot be one or more lone pairs of electrons on the central atom. I thought the answer would be there cannot be because it is linear, but the solutions manual said their may be...
by VictoriaRoderick_3A
Fri Oct 16, 2015 3:40 pm
Forum: Lewis Structures
Topic: Dots for Lewis Structures
Replies: 2
Views: 941

Dots for Lewis Structures

Does it matter where you put the dots for the elements while doing a Lewis Structure? Between the two Lewis Structures attached, which one would be right?

WIN_20151016_15_38_22_Pro.jpg
Example
WIN_20151016_15_38_22_Pro.jpg (32.37 KiB) Viewed 941 times
by VictoriaRoderick_3A
Sun Oct 11, 2015 8:36 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Configurations
Replies: 1
Views: 235

Configurations

I am confused on what number means what during an electronic configuration. So, the first number is the energy level and the row number ( and d is one behind)? The letter tells what orbital the electron is in? The number tells how many electrons are in the orbitals and whether they are paired or par...
by VictoriaRoderick_3A
Sun Oct 11, 2015 7:36 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Configurations
Replies: 1
Views: 209

Configurations

I am confused on what number means what during an electronic configuration. So, the first number is the energy level and the row number ( and d is one behind)? The letter tells what orbital the electron is in? The number tells how many electrons are in the orbitals and whether they are paired or par...
by VictoriaRoderick_3A
Mon Oct 05, 2015 6:56 pm
Forum: Trends in The Periodic Table
Topic: Orbitals and the Periodic Table
Replies: 1
Views: 277

Orbitals and the Periodic Table

During the lecture on 10/5 Professor Lavelle talked about how to you can tell what shape the orbital of an element is based on the periodic table, and I was confused about how this was done exactly. When he described them as blocks, where do they begin and end?

IMG_2141.JPG
Lavelle's Periodic Table
by VictoriaRoderick_3A
Fri Oct 02, 2015 2:33 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 91
Views: 9041

Re: All students read this sig fig post [ENDORSED]

SigFigs are so simple they get confusing, I am just going to stick with the right amount, and if I am skeptical just go with less. My TA said that you can't add precision, but you can make it less precise.
by VictoriaRoderick_3A
Fri Oct 02, 2015 2:29 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic spectra
Replies: 2
Views: 316

Re: Atomic spectra

I am pretty sure is saying that although a new electron can be emitted, the same one can continue to be emitted, and each time it is emitted it loses more energy.
by VictoriaRoderick_3A
Fri Oct 02, 2015 2:28 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 1
Views: 292

Rydberg Equation

For chapter 1 question 57, why is it (1/2^2) - 1(7^2) in the Rydberg equation? Since the two is the first number in the Balmer Series, does the sequence start at 2? The question is trying to solve for the fifth line in the sequence, so would it go N1=2 and then N2=3,4,5,6,7 with 7 being the fifth nu...

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