Search found 27 matches

by Tiffany Lin 2E
Sat Mar 12, 2016 10:40 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Final 2015 7A
Replies: 3
Views: 546

Re: Final 2015 7A

Why?
by Tiffany Lin 2E
Sat Mar 12, 2016 10:36 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Final 2015 7A
Replies: 3
Views: 546

Final 2015 7A

Can rate constants ever be negative? Why or why not?
by Tiffany Lin 2E
Wed Mar 09, 2016 4:27 pm
Forum: *ChemDraw
Topic: Determining Priority
Replies: 1
Views: 692

Determining Priority

For the 2014 final exam, 7E, why is C(OH)3 drawn 180degrees from CN instead of Cl? Isn't Cl the 'bigger' than C(OH)3 and CH3 in terms of atomic number, so why is it not 180degrees from CN ?
by Tiffany Lin 2E
Tue Mar 08, 2016 10:44 pm
Forum: *Ethers
Topic: Ether Naming Order
Replies: 1
Views: 481

Ether Naming Order

Do we always put the functional group substituent for ether first?

For instance, for CH3CH2C(CH3)2CH2CH2OCH2CH2CH3, is the answer:

3-ethyl-1-propoxy pentane?

Or do we ignore alphabetical naming and put
1-propoxy-3-ethyl pentane?
by Tiffany Lin 2E
Sun Feb 28, 2016 6:17 pm
Forum: *Nucleophiles
Topic: Determining Nucleophilic or Electrophilic
Replies: 1
Views: 757

Determining Nucleophilic or Electrophilic

Is CH3OCH3 is nucleophile or electrophile? I think it's a nucleophile because it has lone pairs on O but is there a case where it can have lone pairs and be electrophile?
by Tiffany Lin 2E
Wed Feb 24, 2016 4:06 pm
Forum: *Electrophiles
Topic: Naming Organic Compounds
Replies: 2
Views: 463

Re: Naming Organic Compounds

The part I do not understand is how do we use cis- and trans- to name the compound (E,Z naming)? Do we need to know that for either quiz 3 or the final?
by Tiffany Lin 2E
Sun Feb 21, 2016 10:53 pm
Forum: *Electrophiles
Topic: Naming Organic Compounds
Replies: 2
Views: 463

Naming Organic Compounds

How do we name organic compounds?

I tried following the chart given in the Intro to Organic Chemistry course reader to do the questions on quiz prep 3 practices but can't seem to be getting any of them right.
by Tiffany Lin 2E
Mon Feb 15, 2016 7:24 pm
Forum: General Rate Laws
Topic: HW Problem 15.23c
Replies: 2
Views: 468

HW Problem 15.23c

Q: Determine the rate constant for each of the following first-order reactions, in each case expressed for the rate of loss of A: (c): 2A -> B + C given that [A]o=0.153 molL^-1 and that after 115s the concentration of B rises to 0.034molL^-1. Since the coefficient of A is 2, shouldn't k=2.55x10^-3 s...
by Tiffany Lin 2E
Thu Feb 11, 2016 12:24 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Molecularity
Replies: 2
Views: 498

Molecularity

What exactly is molecularity? and how is it determined?
Why is termolecular molecularity uncommon?
by Tiffany Lin 2E
Thu Feb 04, 2016 10:46 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: HW Problem 14.13b
Replies: 1
Views: 248

HW Problem 14.13b

For part b, the answer is: Pt(s)|I-(aq)|I2(s)||Ce4+(aq), Ce3+(aq)|Pt(s)

For the anode half of the cell notation, why was it necessary to add Pt(s) when a solid (I2) already exists on this half of the the reaction?
by Tiffany Lin 2E
Sat Jan 30, 2016 3:17 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Gold Ring Example from Lecture
Replies: 1
Views: 326

Gold Ring Example from Lecture

Example: Will a gold ring dissolve in 1M nitric acid (HNO3) to form a 1M Au3+ soln? For the part where the change in standard Gibbs free energy of the redox reaction proves that the reaction is not favorable, I do not understand what is considered a 'large' value in order for the reaction to not be ...
by Tiffany Lin 2E
Tue Jan 26, 2016 8:28 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Quiz 1 #7 (2014)
Replies: 1
Views: 360

Quiz 1 #7 (2014)

Predict the sign of molar Gibbs free energy for the process h2o(s) -> h2o(l) at 1atm for the following three temperatures: 1 degrees celsius, 0 degree celsius, and -1 degrees celsius. I understand that enthalpy is +ve and entropy is also +ve, but I don't understand where to go from there to get - , ...
by Tiffany Lin 2E
Thu Jan 21, 2016 9:13 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: #8 in Quiz Prep Winter 2011
Replies: 6
Views: 920

#8 in Quiz Prep Winter 2011

For #8 in the 2011 quiz preparation, why is W=6^NA for bromobenzene (C6H5Br)? (I don't understand where the 6 came from)
by Tiffany Lin 2E
Tue Jan 19, 2016 5:23 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy
Replies: 3
Views: 648

Entropy

What is residual entropy? and how do we calculate it?
by Tiffany Lin 2E
Wed Jan 06, 2016 3:12 pm
Forum: Phase Changes & Related Calculations
Topic: Steam v Water
Replies: 4
Views: 726

Steam v Water

Why does steam cause more damage than water once it comes in contact with human skin? (explained during lecture but I still don't really understand the reasoning)
by Tiffany Lin 2E
Wed Dec 02, 2015 4:43 pm
Forum: *Titrations & Titration Calculations
Topic: Titration
Replies: 1
Views: 388

Titration

What is pOH?
How do we know when to use pH=-log[h3O+] or pH=pKa+log([conjugate base]/[acid])?
by Tiffany Lin 2E
Tue Nov 24, 2015 5:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: I.C.E. Charts
Replies: 1
Views: 382

I.C.E. Charts

How do you know when to use an I.C.E. chart or not?
by Tiffany Lin 2E
Tue Nov 17, 2015 12:01 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Fall 2009 Quiz 3 Prep #9
Replies: 3
Views: 606

Fall 2009 Quiz 3 Prep #9

Why does increasing the concentration of PCl 5 , PCl 3 , and Cl 2 form more PCl 5 ? Problem: For the following reaction at 523K, with K=0.0736, the equilibrium concentrations are: [PCl 5 ] = 0.110M, [PCl 3 ] = [Cl 2 ] = 0.0900M. If suddenly 0.100M PCl 5 , PCl 3 , and Cl 2 were added, what would happ...
by Tiffany Lin 2E
Tue Nov 17, 2015 11:55 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure
Replies: 2
Views: 755

Pressure

I just want to clarify that if the a system is compressed (increasing pressure and decreasing volume), does the reaction side with less moles increase in concentration? and if there are multiple compounds of the indicated side, do both increase? ex: 4NH3 (g) + 5O2 (g) <-> 4NO (g) + 6H2O (g) If the s...
by Tiffany Lin 2E
Mon Nov 09, 2015 8:21 pm
Forum: Naming
Topic: d-Metal Complexes and Compounds
Replies: 1
Views: 339

d-Metal Complexes and Compounds

What are the rules to naming more complex compounds that contain more than one metal atom?
by Tiffany Lin 2E
Sat Nov 07, 2015 5:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Coordination and Naming
Replies: 1
Views: 226

Coordination and Naming

How can you tell when a structure is polydentate or not? Do I just count the number of lone pairs around the atom?
by Tiffany Lin 2E
Mon Oct 26, 2015 8:31 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Length, Bond Order, MO Theory
Replies: 1
Views: 863

Bond Length, Bond Order, MO Theory

Do we have to memorize bond lengths for Quiz 2? For bond orders, what are the antibonding electrons? How do we find it? I am also having trouble approaching this problem (Quiz 2 on Fall 2010 workbook): "In NO, the unpaired electron occupies what type of molecular orbital?" What should I do...
by Tiffany Lin 2E
Fri Oct 23, 2015 3:01 pm
Forum: Lewis Structures
Topic: Exceptions to Octet Rule
Replies: 1
Views: 393

Exceptions to Octet Rule

What are the exceptions to the octet rule besides H, Be, and Li? For some central atoms, they do not follow the octet rule. Why?
by Tiffany Lin 2E
Wed Oct 14, 2015 10:28 pm
Forum: Molarity, Solutions, Dilutions
Topic: Concentration Calculations
Replies: 11
Views: 3070

Concentration Calculations

Problem: A student prepared a solution of sodium carbonate by adding 2.111 g of the solid to a 250.0-mL volumetric flask and adding water to the mark. Some of this solution was transferred to a buret. What volume of solution should the student transfer into a flask to obtain (a) 2.15 mmol Na+ (b) 4....
by Tiffany Lin 2E
Thu Oct 08, 2015 10:56 pm
Forum: Empirical & Molecular Formulas
Topic: Fundamentals - Nomenclature
Replies: 2
Views: 510

Fundamentals - Nomenclature

What is nomenclature, and what are some tips to memorizing how to write the chemical formula for compounds (e.g. are there patterns or rules that we need to memorize for the quizzes)?
by Tiffany Lin 2E
Thu Oct 01, 2015 9:26 am
Forum: Photoelectric Effect
Topic: Work Function and Incident Radiation
Replies: 1
Views: 2824

Work Function and Incident Radiation

What is incident radiation and how do you find the work function? I know that the work function is the minimal energy required to eject and electron, but how do you know if you're looking for the minimal energy or not? (if that makes sense) In this case, am I supposed to use the energy formula for p...

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