Search found 27 matches

by Shadi_Keyvani_1D
Sat Mar 18, 2017 9:05 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: 2015 Final 6B
Replies: 1
Views: 339

Re: 2015 Final 6B

Catalysts are always okay to have in the rate law b/c they are originally present and then reformed but intermediates are not as they are formed and then gone.
by Shadi_Keyvani_1D
Tue Mar 14, 2017 1:40 pm
Forum: *Alcohols
Topic: Functional Groups and Double/Triple Bonds
Replies: 1
Views: 521

Re: Functional Groups and Double/Triple Bonds

I think that this would be something we are tested on, meaning an alkene or alkyne and another functional group in the parent chain.
by Shadi_Keyvani_1D
Tue Mar 14, 2017 1:37 pm
Forum: *Alkenes
Topic: Alkenes as functional groups
Replies: 1
Views: 301

Re: Alkenes as functional groups

If the alkene is part of the longest parent chain, it is thought of as a functional group part of that chain, meaning that it must be prioritized in naming. This is is different from a substituent which is attached separately somewhere along the parent chain.
by Shadi_Keyvani_1D
Mon Mar 06, 2017 12:31 pm
Forum: *Alkanes
Topic: Molecular Formula and Chemical Structure
Replies: 2
Views: 305

Re: Molecular Formula and Chemical Structure

This is saying that we don't know the specific structure of compounds with more than 4 carbon atoms due to the existence of constitutional isomers b/c of different unbranched/branched structures.
by Shadi_Keyvani_1D
Mon Mar 06, 2017 12:17 pm
Forum: *Cycloalkenes
Topic: Naming: IUPAC & Common Naming
Replies: 2
Views: 429

Re: Naming: IUPAC & Common Naming

According to the textbook, IUPAC naming and common naming can be combined when naming compounds.
by Shadi_Keyvani_1D
Thu Feb 23, 2017 2:17 pm
Forum: *Electrophiles
Topic: electrophile vs neutrophile
Replies: 2
Views: 351

Re: electrophile vs neutrophile

it is positive and wants to gain electrons!
by Shadi_Keyvani_1D
Sun Feb 19, 2017 4:31 pm
Forum: General Rate Laws
Topic: Unique rate law Question 15.5(A)
Replies: 1
Views: 328

Re: Unique rate law Question 15.5(A)

Write it as a positive answer! This is how the solutions manual does it :)
by Shadi_Keyvani_1D
Thu Feb 09, 2017 3:38 pm
Forum: Balancing Redox Reactions
Topic: Redox Memorization Tips
Replies: 4
Views: 536

Redox Memorization Tips

What are some memorization tactics for knowing what is getting oxidized and whats getting reduced?
by Shadi_Keyvani_1D
Thu Feb 02, 2017 3:48 pm
Forum: Balancing Redox Reactions
Topic: reduction vs. oxidation
Replies: 3
Views: 370

Re: reduction vs. oxidation

The oxidizing number is shown by the charge of each molecule involved in the reaction. For example: the charge of O is -2. Then, you look at which molecule has been reduced (gained electrons) and which has been oxidized (lost electrons) on the product side.
by Shadi_Keyvani_1D
Thu Jan 26, 2017 3:48 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Entropy moles
Replies: 2
Views: 352

Re: Entropy moles

This is because Delta S Subscript M is given per mole so you must always divide by the number of moles of the substance to get it to be per 1 mole. :)
by Shadi_Keyvani_1D
Fri Jan 20, 2017 9:44 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy of Formation and Specific Heat Capacity [ENDORSED]
Replies: 1
Views: 298

Re: Standard Enthalpy of Formation and Specific Heat Capacity [ENDORSED]

I believe that we will be given all of the values for standard enthalpy of formation and specific heat capacity for a problem presented on quizzes/tests. I don't think we are required to memorize any of these values.
by Shadi_Keyvani_1D
Sun Jan 15, 2017 9:40 pm
Forum: Phase Changes & Related Calculations
Topic: Temp in Phase Change
Replies: 3
Views: 324

Re: Temp in Phase Change

Changing the amount of heat energy usually causes a temperature change. However, during the phase change, the temperature stays the same even though the heat energy changes. This energy is going into changing the phase and not into raising the temperature. This means that there is a constant tempera...
by Shadi_Keyvani_1D
Sat Dec 03, 2016 4:32 pm
Forum: General Science Questions
Topic: Chem 14B Discussion 1K
Replies: 1
Views: 512

Re: Chem 14B Discussion 1K

I'd like to switch! I have Lec 1 Disc 1D if you're interested. My email is shadikeyvani386@yahoo.com.
by Shadi_Keyvani_1D
Sat Dec 03, 2016 4:26 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Final 2015 Q2A
Replies: 1
Views: 403

Re: Final 2015 Q2A

As the question states, this equation from the experimentally observed H-atom line spectrum, so it is empirical since it is based on observation rather than simply theory.
by Shadi_Keyvani_1D
Sat Dec 03, 2016 4:24 pm
Forum: Polyprotic Acids & Bases
Topic: Fall 2012 Final Exam Question 8
Replies: 1
Views: 415

Re: Fall 2012 Final Exam Question 8

The second dissociation results in 5.6 x 10^-11 mol/L which we add to 4.0 x 10^-5 and end up with 4.0x 10^-5 mol/L because 5.6 x 10^-11 mol/L is so small in relation that makes it have no significance when the addition is done.
by Shadi_Keyvani_1D
Sat Dec 03, 2016 4:18 pm
Forum: Naming
Topic: charge question
Replies: 1
Views: 264

Re: charge question

Cations all have positive charge and anions all have negative charge.
by Shadi_Keyvani_1D
Sat Dec 03, 2016 4:13 pm
Forum: Naming
Topic: Naming Coordination Compounds
Replies: 2
Views: 359

Re: Naming Coordination Compounds

If there is already a prefix in the name of the ligand (for example, ethylenediamine) and you have 2 or more of that in your coordination compound, you would use bis, tris, etc. to indicate that.
by Shadi_Keyvani_1D
Wed Nov 16, 2016 11:01 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Correct way to write molecular configuration?
Replies: 1
Views: 254

Re: Correct way to write molecular configuration?

I don't think we have to specify the specific ones based on the book and solution manual.
by Shadi_Keyvani_1D
Wed Nov 16, 2016 10:59 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: Heteronuclear Molecule MO notation
Replies: 1
Views: 631

Re: Heteronuclear Molecule MO notation

This is for all heteronuclear models.
by Shadi_Keyvani_1D
Wed Nov 16, 2016 10:58 pm
Forum: Naming
Topic: What's the formula for this coordination compound?
Replies: 2
Views: 1247

Re: What's the formula for this coordination compound?

[CoBr2(en)2] SO4 but I think it should be an ion with a negative 1 charge.
by Shadi_Keyvani_1D
Mon Nov 07, 2016 11:56 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: How does H2+ exist?
Replies: 1
Views: 970

Re: How does H2+ exist?

From my understanding, an element with a bond order of 0 cannot exist but those with fractional values exist and are not stable.
by Shadi_Keyvani_1D
Mon Oct 31, 2016 11:03 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7666
Views: 1036479

Re: Post All Chemistry Jokes Here

Hallow=Hallow : Halloween!







(Double bond means "ene")
by Shadi_Keyvani_1D
Sun Oct 23, 2016 8:25 pm
Forum: Lewis Structures
Topic: Lewis Structure
Replies: 3
Views: 434

Re: Lewis Structure

Another disadvantage could be the lack of 3 dimensional modeling. The specific shape of the molecule is not made known by the Lewis Structure.
by Shadi_Keyvani_1D
Sun Oct 23, 2016 8:21 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi bonds
Replies: 1
Views: 346

Re: Sigma and Pi bonds

You don't need to know this for Quiz 2, it will be covered in Chapter 4.
by Shadi_Keyvani_1D
Sun Oct 09, 2016 4:14 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7666
Views: 1036479

Re: Post All Chemistry Jokes Here

What element is a girl's future best friend?

Carbon!
by Shadi_Keyvani_1D
Sun Sep 25, 2016 7:41 pm
Forum: Empirical & Molecular Formulas
Topic: Determining Empirical Formula from Ball and Stick Structures [ENDORSED]
Replies: 1
Views: 1324

Determining Empirical Formula from Ball and Stick Structures [ENDORSED]

I understand how to determine the molecular formula, but how would I find the empirical formula based on the structures? Question F.25

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