Search found 22 matches

by Allison Maryoung 1D
Wed Mar 09, 2016 6:43 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Boat vs Chair
Replies: 1
Views: 417

Re: Boat vs Chair

The chair conformation is more stable because it does not have any steric strain and torsional strain. Its Hydrogens are staggered. The boat has the two flagpole Hydrogens that cause steric tension and 4 pairs of eclipsed Hydrogen that cause torsional strain.
by Allison Maryoung 1D
Tue Mar 01, 2016 7:41 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Cis and Trans in line structures
Replies: 1
Views: 289

Cis and Trans in line structures

If I was given a line structure of a molecule, how do I know when to add cis- or trans- when naming the molecule? Some molecules do not have cis or trans in the name.
by Allison Maryoung 1D
Sun Feb 28, 2016 9:55 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Quiz 2 Question 8
Replies: 1
Views: 357

Re: Quiz 2 Question 8

In a termolecular reaction I believe that the process of finding the intermediates and overall reaction would be the same as in the bimolecular reaction. Termolecular reaction just has one more reactant in the equation. As for the number of intermediates, it depends on the number of products found i...
by Allison Maryoung 1D
Thu Feb 18, 2016 8:50 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Reaction Profiles
Replies: 1
Views: 331

Re: Reaction Profiles

There really is no difference between being energetically favorable or spontaneous. Being spontaneous is the negative delta G (Gibbs free energy) and energetically favorable is when there is lower activation energy. On graphed energy curves, if a reaction is favorable and spontaneous, then the react...
by Allison Maryoung 1D
Tue Feb 09, 2016 8:45 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: When to use ln vs log
Replies: 1
Views: 450

Re: When to use ln vs log

You can use either one when solving for the Nernst equation. ln*e and are essentially the same thing when you are trying to isolate K. If you were looking for the pH then you could just solve for log K without base 10 because log [H+]=pH.
by Allison Maryoung 1D
Sun Feb 07, 2016 10:34 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 3
Views: 487

Re: Cell Diagrams

Another order is to have solids on the outsides of the diagrams while having gases and liquids on the inside of the diagrams. Don't forget to use a comma when there are molecules of the same phase.
by Allison Maryoung 1D
Wed Feb 03, 2016 9:51 pm
Forum: Balancing Redox Reactions
Topic: Adding electrons to reactant or product?
Replies: 1
Views: 399

Re: Adding electrons to reactant or product?

Adding electrons to the reactant or product side depends on the charges on both sides. For example, if you were given Pb^{+2}\rightarrow Pb there is an overall +2 charge on the reactant side and you would add 2 electrons to this side. The product side has an overall charge of 0. The goal is to get t...
by Allison Maryoung 1D
Thu Jan 28, 2016 7:04 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Quiz 1 Preparation, Winter 2014 #8
Replies: 1
Views: 465

Re: Quiz 1 Preparation, Winter 2014 #8

The answer is A because there is an increase in entrophy and enthalpy. As Cl_{2\rightarrow }2Cl there is an increase in enthalpy because the Cl_{2} needs heat to break the bond. There is only one bond broken and no bonds formed, so there is an increase in enthalpy. Entropy can be found by the number...
by Allison Maryoung 1D
Fri Jan 22, 2016 12:01 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Cp,m
Replies: 2
Views: 1335

Re: Cp,m

m is the molar heat capacity, or the heat needed to raise the temperature of 1 mole of substance by 1 degree Celsius. Cp,m means molar heat capacity at constant pressure. Cv,m means molar heat capacity at constant volume.
by Allison Maryoung 1D
Thu Jan 14, 2016 4:27 pm
Forum: Phase Changes & Related Calculations
Topic: Steam Burns
Replies: 4
Views: 798

Re: Steam Burns

Steam causes severe burns due to a rapid phase change when steam comes into contact with something cold like a hand. This rapid phase change causes steam to phase change into water. This change releases a large amount of energy or heat onto the hand giving it a burn.
by Allison Maryoung 1D
Thu Jan 14, 2016 4:22 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Specific Heat Capacities degrees Celsius vs. Kelvin
Replies: 2
Views: 7031

Re: Specific Heat Capacities degrees Celsius vs. Kelvin

The specific heat capacity is the heat needed to raise the temperature of 1g of substance by 1 degree Celsius. 1 degree Celsius=1 degree Kelvin. When solving specific heat capacity in Kelvin, Kelvin=Celsius because the distance from one degree to the next degree in both Celsius and Kelvin is the same.
by Allison Maryoung 1D
Thu Jan 07, 2016 9:10 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy
Replies: 4
Views: 679

Re: Enthalpy

Enthalpy is a state function because it is the calculated result of the amount of heat absorbed or released. The formula q_p=∆H shows that P is constant pressure so the amount of heat absorbed or released during a chemical reaction will be the same. This effect demonstrates that to get enthalpy, its...
by Allison Maryoung 1D
Sun Dec 06, 2015 7:34 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Halfway Point
Replies: 1
Views: 746

Halfway Point

How do I find the pH of a halfway point of a solution when I'm given the pH of the stoichiometric point. If the pH=9.25 at 20 mL is there a way I can find the halfway point? Is there any connection between the halfway point and the stoichiometric point besides finding the halfway point at half of th...
by Allison Maryoung 1D
Sun Nov 29, 2015 8:41 pm
Forum: Lewis Acids & Bases
Topic: Lewis Acids and Bases
Replies: 5
Views: 1008

Re: Lewis Acids and Bases

A lewis acid is any cation that can accept an electron pair and an atom or molecule with an incomplete octet. An example of a lewis acid is BF_{3} because it has an incomplete octet and can accept a lone pair in order to complete the octet. A lewis base is any anion that can donate an electron pair....
by Allison Maryoung 1D
Sun Nov 22, 2015 12:54 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH of [H3O+]
Replies: 1
Views: 1442

Re: pH of [H3O+]

If = then the pH=7 because . So the solution will have neutral characteristics. This is true because of autoprotolysis, or when the proton transfers between two molecules and is accepted by the base which is
by Allison Maryoung 1D
Fri Nov 13, 2015 4:11 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Inert Gasses
Replies: 1
Views: 363

Re: Inert Gasses

Inert gases would not effect equilibrium if there is a constant volume, but the total pressure would increase. If the reactant gases still have the same volumes before the inert gas was added, then the molar concentrations and pressures will be the same. The presence of an inert gas will still lead ...
by Allison Maryoung 1D
Thu Nov 05, 2015 4:39 pm
Forum: Naming
Topic: Naming Complex Ions with Charges
Replies: 1
Views: 582

Re: Naming Complex Ions with Charges

Yes, you are right. If the complex ion has an overall positive charge, then it has ion at the end. We must also give an oxidation number, or Roman numeral, to transition metals found in a complex ion. For example, if we were to name [CrCl_{2}(H_{2}O)_{4}]^{+} we would have to say tetraaquadi...
by Allison Maryoung 1D
Thu Oct 29, 2015 10:26 pm
Forum: Octet Exceptions
Topic: Number of bonds for an atom with an extended octet
Replies: 1
Views: 312

Number of bonds for an atom with an extended octet

Hi. I have a question about the maximum number of bonds for an atom with an extended octet. How many bonds can one atom like Cl and S have, and is the maximum number of bonds for one atom the same for all atoms in period 3 and below? In the homework we have only seen up to six bonds per atom like in...
by Allison Maryoung 1D
Wed Oct 21, 2015 5:35 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions in electron configuration
Replies: 1
Views: 3513

Re: Exceptions in electron configuration

All of the elements in group 6 and 11 in the d block are exceptions since they would all end up with nd^{4} or nd^{9} respectively. The elements in group 6 and 11 need to take an electron from the ns orbital in order to get d^{5} and d^{10} subshells. For example, if we were trying to find the elect...
by Allison Maryoung 1D
Thu Oct 15, 2015 4:43 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg uncertainty
Replies: 1
Views: 398

Re: Heisenberg uncertainty

For the Heisenberg Indeterminacy Equation, \Delta x*\Delta p\geq h/4\Pi the speed is also the velocity so \Delta p=\Delta v*m For example, if the speed is 1\pm 2(m/s) we would multiply (2*2) because we are finding the range between -1 and 3 which is 4 or (2*2). We would plug 4 into \Delta v ...
by Allison Maryoung 1D
Mon Oct 05, 2015 8:28 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron Energy and Orbital Energy
Replies: 1
Views: 375

Re: Electron Energy and Orbital Energy

The higher the energy, the larger the orbital means that as the energy levels or n=1, 2, 3, etc. increase, then the orbitals which are s, p, d, f are becoming larger. So the larger the energy level, the farther away the electrons are from the nucleus and the less electrostatic attraction the electro...
by Allison Maryoung 1D
Wed Sep 30, 2015 9:52 pm
Forum: Empirical & Molecular Formulas
Topic: L29
Replies: 1
Views: 385

Re: L29

Since we know that Sn combines with O 2 to form an oxide, we can use the masses given to us. We can use 1.50gSn and divide it by its molar mass, which is 118.711g Sn and end up with 1.26*10 -2 mol Sn. To find the O we would subtract the total mass from the crucible. 28.35g-26.45g=1.90g 1.90g is the ...

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