Search found 24 matches

by Hirmand_Sarafian_2N
Fri Mar 17, 2017 10:48 pm
Forum: *Cycloalkenes
Topic: Where to start counting Winter 2013 final 6A
Replies: 6
Views: 1513

Re: Where to start counting Winter 2013 final 6A

The double bond takes priority and you need to move across it so you have to start at 1 for the double bond and move left
by Hirmand_Sarafian_2N
Fri Mar 17, 2017 8:44 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Inclusion of Transition States
Replies: 1
Views: 487

Inclusion of Transition States

When drawing organic reaction mechanisms using the curved lines method, should we include (draw in) the transition states also?
by Hirmand_Sarafian_2N
Tue Mar 07, 2017 8:49 pm
Forum: *Electrophilic Addition
Topic: Steric Contriubtion to Standard Enthalpies of Activation
Replies: 1
Views: 536

Steric Contriubtion to Standard Enthalpies of Activation

Can someone explain to me what is the steric contributon to standard enthalpies of activation? Also will this be on the quiz?
by Hirmand_Sarafian_2N
Wed Mar 01, 2017 10:07 am
Forum: Administrative Questions and Class Announcements
Topic: Midterm Winter 2017
Replies: 87
Views: 14400

Re: Midterm Winter 2017

Just wondering, is there any curve applied to the midterm? Thanks
by Hirmand_Sarafian_2N
Tue Feb 21, 2017 8:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 2 Winter 2017
Replies: 160
Views: 15301

Re: Quiz 2 Winter 2017

Can somebody explain to me why 10 on the quiz 2 prep is false?
by Hirmand_Sarafian_2N
Mon Feb 13, 2017 9:17 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Inert Electrodes
Replies: 1
Views: 266

Inert Electrodes

Can someone explain to me what the criteria is to use inert electrodes, like Platinum in most cases?
by Hirmand_Sarafian_2N
Fri Feb 10, 2017 3:04 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Molecular Entropy
Replies: 3
Views: 447

Molecular Entropy

How do you determine which molecule has more entropy? For example, CO or N2 in Quiz 1
by Hirmand_Sarafian_2N
Mon Jan 30, 2017 9:13 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Positive and Negative
Replies: 1
Views: 253

Positive and Negative

For the deltaU=q+w equation, is work performed on the system positive or is work performed by the system positive? Also, just to clarify, heat absorbed by a system is positive q correct?
by Hirmand_Sarafian_2N
Sun Jan 29, 2017 12:48 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Quiz Prep 1 #9
Replies: 2
Views: 375

Quiz Prep 1 #9

On 9, I understand that (q and w) and w are not correct, but how do we determine which of the other 3 answers are nonzero?
by Hirmand_Sarafian_2N
Sun Jan 29, 2017 12:45 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Quiz Prep 1 #8
Replies: 1
Views: 290

Quiz Prep 1 #8

On 8, since Delta H is positive and deltaS is negative, will the reaction never be spontaneous since deltaG can never be negative?
by Hirmand_Sarafian_2N
Fri Jan 27, 2017 9:43 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Changing Pressure
Replies: 1
Views: 241

Re: Changing Pressure

It depends on what parameters are kept constant
by Hirmand_Sarafian_2N
Fri Jan 20, 2017 2:42 pm
Forum: Calculating Work of Expansion
Topic: Gas Expansion when Internal Energy is 0 [ENDORSED]
Replies: 1
Views: 287

Gas Expansion when Internal Energy is 0 [ENDORSED]

In today's example of the work performed during gas Expansion, how does the gas expand if the internal energy is equal to zero since heat and work are equal and opposite?
by Hirmand_Sarafian_2N
Fri Jan 13, 2017 2:24 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 5
Views: 541

Re: Hess's Law

You multiply the standard enthalpies of formation of each product by the number of moles needed and all the values together; you then do the same for the reactants. Finally, subtract the reactants' value from the products' value to get the standard reaction enthalpy of the whole reaction in kJ.
by Hirmand_Sarafian_2N
Fri Dec 02, 2016 7:40 pm
Forum: *Titrations & Titration Calculations
Topic: con = h/v question
Replies: 2
Views: 289

Re: con = h/v question

It's not an h. It's an n and it means moles of whatever you are finding the concentration of.
by Hirmand_Sarafian_2N
Fri Nov 25, 2016 5:41 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1012793

Re: Post All Chemistry Jokes Here

"Last night, a hypnotist convinced me that I was a soft, malleable metal with an atomic number of 82... I am easily lead."
by Hirmand_Sarafian_2N
Fri Nov 18, 2016 5:49 pm
Forum: Bronsted Acids & Bases
Topic: Strong acids and Bases [ENDORSED]
Replies: 1
Views: 335

Re: Strong acids and Bases [ENDORSED]

Strong acids produce more protons than weak acids do in a solution; they show nearly 100% ionization. Likewise, strong bases are entirely ionized in water unlike weak bases which are only partially ionized.
by Hirmand_Sarafian_2N
Fri Nov 11, 2016 4:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc or Kp
Replies: 2
Views: 296

Kc or Kp

Are Kc and Kp equal in value? If not, how do you know when to use Kp and when to use Kc?
by Hirmand_Sarafian_2N
Thu Nov 03, 2016 4:39 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: MO diagram for D-orbital valence electrons
Replies: 1
Views: 257

MO diagram for D-orbital valence electrons

If you bond an atom with filled or partially filled d-orbitals in its valence with one without the d-orbitals filled at all, how would the molecular orbital diagram change if at all?
by Hirmand_Sarafian_2N
Fri Oct 28, 2016 4:26 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: M.O.T. on midterm clarification
Replies: 1
Views: 363

Re: M.O.T. on midterm clarification

Yeah, today he told us that they midterm will cover everything up to the end of hybridization, so molecular orbital theory shouldn't be on there and neither will the antibonding and bonding molecular orbitals.
by Hirmand_Sarafian_2N
Wed Oct 19, 2016 8:04 pm
Forum: Lewis Structures
Topic: Group 13 Elements [ENDORSED]
Replies: 1
Views: 224

Re: Group 13 Elements [ENDORSED]

Boron and aluminum are exceptions to the octet rule since they can have less than 8 valence electrons like in boron trifluoride; however, these compounds tend to take part in Lewis acid-base reactions where a coordinate covalent bond is formed giving these elements the full octet like when boron tri...
by Hirmand_Sarafian_2N
Wed Oct 12, 2016 7:33 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Significant Figures
Replies: 4
Views: 515

Re: Significant Figures

You use the amount of significant figures in the constant you used, so you just use whatever amount of sig figs that the rydberg constant has on our chart of values.
by Hirmand_Sarafian_2N
Wed Oct 05, 2016 8:41 pm
Forum: Photoelectric Effect
Topic: Intensity and Kinetic Energy
Replies: 1
Views: 195

Intensity and Kinetic Energy

Once light has the frequency capable to overcome the threshold energy and remove the electron leaving excess kinetic energy that moves the electron at a particular velocity, does increasing the intensity of the light have an effect on the kinetic energy of the increased amount of removed electrons o...
by Hirmand_Sarafian_2N
Sun Oct 02, 2016 3:18 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 1
Views: 243

Re: Photoelectric Effect

Initially, light was only thought of as a wave, so in this experiment, scientists attempted to use high wavelength, low frequency light to remove the electrons off the metal surface. When electrons were not first removed, they believed that simply raising the intensity of the light, its amplitude, w...
by Hirmand_Sarafian_2N
Sun Sep 25, 2016 11:15 pm
Forum: Significant Figures
Topic: Significant figure rules
Replies: 4
Views: 503

Re: Significant figure rules

In chemistry, when rounding our answers, do we round up if equal to or greater than 0.5 over the last digit and down if less than 0.5 over the last digit, or do we simply round to the nearest even digit?

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