Search found 21 matches

by Alyssa-Marie Dones
Fri Mar 11, 2016 3:30 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: half lives
Replies: 4
Views: 8348

Re: half lives

Multiplying the half life by 2 to get a "fourth life" would only work with a first order reaction though right?
by Alyssa-Marie Dones
Fri Mar 11, 2016 3:27 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Z/E for Chair
Replies: 2
Views: 422

Re: Z/E for Chair

(they don't have to be c's on opposite sides of the chair conformation?)
by Alyssa-Marie Dones
Fri Mar 11, 2016 3:27 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Z/E for Chair
Replies: 2
Views: 422

Z/E for Chair

During Idean's Review he mentioned that for a structure to be Z all that needs to happen is for the substituents to be going in the same direction whether they be equatorial or axial. Does this also mean that the two substituents can be coming off of any of the 6 carbons and be considered Z as long ...
by Alyssa-Marie Dones
Wed Mar 02, 2016 9:58 pm
Forum: *Alkynes
Topic: SELF TEST 1.7A b)
Replies: 1
Views: 496

SELF TEST 1.7A b)

Part b of this question asks for the structural formula for 4-methyl-1-pentyne and the answer to this was CHCCH2CH(CH3)CH3. Would it be wrong if I answered it as CHCCH2CH(CH3)2?
Thank you!
by Alyssa-Marie Dones
Wed Mar 02, 2016 9:47 pm
Forum: *Cycloalkenes
Topic: SELF TEST 1.11A b)
Replies: 2
Views: 408

SELF TEST 1.11A b)

In part b for this question, the answer says that this cycloalkene should be named 1,6-dimethylcyclohexa-1,4-diene. With this answer, the C with the first methyl on the left side would be numbered 1 and the other Cs would be numbered accordingly, counter clockwise. With the way I answered it, that s...
by Alyssa-Marie Dones
Tue Feb 09, 2016 12:15 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Hw 14.11 part d
Replies: 1
Views: 326

Re: Hw 14.11 part d

I have a question about this as well, but regarding how to actually figure out the half reactions. How would you know to include water in the half reactions? Could someone please explain this to me conceptually? Thank you!
by Alyssa-Marie Dones
Mon Feb 08, 2016 11:03 pm
Forum: Administrative Questions and Class Announcements
Topic: formula sheet for the midterm
Replies: 1
Views: 285

formula sheet for the midterm

Good evening, I was wondering if we'd be getting the same formula sheet that we got for the first quiz for the midterm or will we be getting one with more equations included?

Thank you for your time.
by Alyssa-Marie Dones
Wed Jan 27, 2016 3:52 pm
Forum: Calculating Work of Expansion
Topic: How much work water do when it freezes?
Replies: 7
Views: 2544

Re: How much work water do when it freezes?

Me and my friend were studying for our quiz and spent quite a while working on this question. In the end, we also got the same answer that Kitu Konya got and used the same method. I think the answer in the book is wrong.
by Alyssa-Marie Dones
Mon Jan 18, 2016 6:10 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: State of Matter and Entropy
Replies: 1
Views: 314

Re: State of Matter and Entropy

The state of matter moving from the solid state to a liquid or gaseous state increases a substances entropy as a bigger tendency to move toward randomness comes with the particles' increasing ability to move
by Alyssa-Marie Dones
Sun Jan 17, 2016 5:58 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: internal energy (u)
Replies: 2
Views: 227

Re: internal energy (u)

I think this is the question that we kind of went over in class on friday (course reader pg 34). If deltaU is zero because it's based on an ideal gas and the temperature is constant bc it's isothermal, the reason why the gas still expands is bc it's spontaneous due to an entropy increase since havin...
by Alyssa-Marie Dones
Sat Jan 09, 2016 10:52 pm
Forum: Phase Changes & Related Calculations
Topic: Hess's Law Dependence on Enthalpy as State Function
Replies: 1
Views: 309

Re: Hess's Law Dependence on Enthalpy as State Function

Hess law states that the total enthalpy change of a reaction is the sum of all the changes. A state function is a thermodynamic quantity which only depends on the present state, not the pathway in which it was reached. Hess' Law is thus based off the fact that enthalpy is a state function because to...
by Alyssa-Marie Dones
Thu Dec 03, 2015 11:13 pm
Forum: *Biological Importance of Buffer Solutions
Topic: Blood as a Buffer Solution
Replies: 1
Views: 804

Re: Blood as a Buffer Solution

2 H2O + CO2 H2CO3 + H2O H3O+ + HCO3 our body uses a feedback mechanism used to maintain homeostasis. the Carbonic Acid- bicarbonate ion-buffer system is used to regulate the pH levels in our blood. When our blood pH becomes acidic the buffer favors the forward reaction to increase the pH and when ou...
by Alyssa-Marie Dones
Sun Nov 29, 2015 11:55 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Negative pH???
Replies: 2
Views: 405

Re: Negative pH???

Hey Arielle,
Yes it's possible!!A negative pH can result if the molarity of Hydrogen ions is greater than 1.
by Alyssa-Marie Dones
Sun Nov 22, 2015 11:17 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH Values of Weak and Strong Acids
Replies: 1
Views: 396

Re: pH Values of Weak and Strong Acids

Hey Jon, pH is a measure of the hydrogen ions in a solution, the greater the concentration, the lower the pH. A strong acid is one that is virtually 100% ionized, having a high concentration of hydrogen ions when in solution,and thus having a low pH. A weak acid, however, isn’t completely ionized, h...
by Alyssa-Marie Dones
Sun Nov 15, 2015 5:11 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's Principle: Effects of Temperature
Replies: 1
Views: 342

Re: Le Chatelier's Principle: Effects of Temperature

In general, increasing the temperature of a reaction increases the rate of the forward reaction because the higher the temperature, the higher the kinetic energy of the reactant’s atoms therefore increasing their movement and thus also increasing the probability that the atoms/molecules of the react...
by Alyssa-Marie Dones
Sat Nov 07, 2015 2:33 am
Forum: Photoelectric Effect
Topic: when to use photoelectric effect or debroglie?
Replies: 3
Views: 922

when to use photoelectric effect or debroglie?

On the recent midterm we had a question in which we were supposed to find the wavelength of an ejected electron given it's velocity. I personally used Kinetic Energy= 1/2mv^2 and once I found the kinetic energy I used wavelength= hc/E to find the wavelength. I assumed that using this way would be ok...
by Alyssa-Marie Dones
Sun Nov 01, 2015 8:16 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Energy of Antibonding sigma 2Pz MOs with Z<8
Replies: 1
Views: 663

Energy of Antibonding sigma 2Pz MOs with Z<8

When we were discussing the energies of anti bonding molecular orbitals in class, prof Lavelle said that they'll be equal and opposite to the energy of the bonding MOs i.e. the lower the energy of the bonding MOs the higher the energy of the anti bonding MOs. Why then are the anti bonding sigma*2pz ...
by Alyssa-Marie Dones
Sun Oct 25, 2015 11:34 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Homonuclear diatomic molecules
Replies: 1
Views: 177

Homonuclear diatomic molecules

Can someone please explain further how homonuclear diatomic molecules are made out of molecular orbitals?
Please and thank you!
by Alyssa-Marie Dones
Sat Oct 17, 2015 8:27 pm
Forum: Resonance Structures
Topic: Stop when formal charge of central atom is zero?
Replies: 1
Views: 340

Stop when formal charge of central atom is zero?

Hello all, In Monday's lecture, we went over the formal charge for the sulfate ion and found that the most stable structure for it would be one with 2 double bonds and 2 single bonds with Sulfur having a FC of 0 and the oxygens with the double bonds having a FC of 0 and the oxygens with the single b...
by Alyssa-Marie Dones
Fri Oct 09, 2015 2:52 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Schrodinger's Equation
Replies: 1
Views: 363

Re: Schrodinger's Equation

Schrodinger's equation is based off the knowledge that electrons have "wavelike properties... [having indeterminancies] in momentum and position...[that] can be described [by] a wave function". When this wave function is squared, we are able to find the general area where we could have a c...
by Alyssa-Marie Dones
Fri Oct 02, 2015 10:15 pm
Forum: DeBroglie Equation
Topic: De Broglie Equation in terms of Light
Replies: 2
Views: 438

De Broglie Equation in terms of Light

Good Evening y'all! I have a question that I need a bit of clarification on. Today in class, Prof. Lavelle was explaining how we can use the De Broglie equation to calculate the length of the wavelength for anything that has momentum and energy such as photons and electrons. However, he also said th...

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