Search found 23 matches

by emilie liu 3G
Thu Mar 16, 2017 8:06 pm
Forum: *Amines
Topic: Final 2013 5A
Replies: 3
Views: 401

Re: Final 2013 5A

A secondary amine is connected to two carbons
by emilie liu 3G
Tue Mar 14, 2017 1:20 pm
Forum: *Alkenes
Topic: Alkenes as functional groups
Replies: 1
Views: 258

Alkenes as functional groups

When identifying functional groups in a molecule, why would we consider a double bonded group an "alkene functional group"? I thought that the double bond must be included in the parent chain as opposed to a functional group or substituent.
by emilie liu 3G
Mon Mar 06, 2017 10:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 14438

Re: Quiz 3 Winter 2017

Will we have to know tert and sec for the quiz or can we use the IUPAC names for them instead of common names?
by emilie liu 3G
Tue Feb 28, 2017 6:55 pm
Forum: *Alkanes
Topic: Naming [ENDORSED]
Replies: 92
Views: 7262

Re: Naming [ENDORSED]

Yes, you use the dashes to separate words from numbers, but the example 3-ethyl-5-methyl-octane would not need a dash between methyl and octane so it would essentially be written 3-ethyl-5-methyloctane
by emilie liu 3G
Tue Feb 21, 2017 6:27 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Units
Replies: 7
Views: 460

Re: Units

It should not matter which units you use in your answer as long as the value is correct and corresponds to the units you use. I noticed in the textbook that if they usually have the answers in the units that they provided in the question!
by emilie liu 3G
Mon Feb 13, 2017 10:35 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Calculation K (equilibrium constant)
Replies: 1
Views: 204

Calculation K (equilibrium constant)

I was wondering when we are asked to calculate standard Ecell, standard Gibbs free energy, and K for a redox reaction, when calculating K should we use: Enaughtcell= (RT/nF)(lnK) or deltaGnaught=-RTlnK or are both acceptable?
by emilie liu 3G
Tue Feb 07, 2017 5:07 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Problem 14.25 [ENDORSED]
Replies: 1
Views: 295

Re: Problem 14.25 [ENDORSED]

The solution manual seems to go off the on with the one that is most strongly reducing! When looking at Appendix B, choose the one closest to the strongly reducing side, the most negative E value.
by emilie liu 3G
Tue Jan 31, 2017 3:00 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: Using the Boltzmann Equation [ENDORSED]
Replies: 1
Views: 299

Using the Boltzmann Equation [ENDORSED]

How do we know when to raise W to the power of Avogadro's number and when not to? Also to calculate W is it the number of arrangements/states to the power of the number of particles?
by emilie liu 3G
Tue Jan 24, 2017 6:05 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: What is "standard" [ENDORSED]
Replies: 1
Views: 183

Re: What is "standard" [ENDORSED]

standard state is defined as 298.15K and 1atm
by emilie liu 3G
Tue Jan 17, 2017 1:09 pm
Forum: General Science Questions
Topic: 2 different R constants?
Replies: 2
Views: 390

Re: 2 different R constants?

You can determine which R constant to use in the problem depending on the units of the problem. The units of R should match the units in your problem.
by emilie liu 3G
Tue Jan 10, 2017 8:19 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 788445

Re: Post All Chemistry Jokes Here

My chemistry professor threw sodium chloride at me! That's a salt!
by emilie liu 3G
Sun Dec 04, 2016 9:01 pm
Forum: Hybridization
Topic: Polar/nonpolar [ENDORSED]
Replies: 14
Views: 1182

Re: Polar/nonpolar [ENDORSED]

Yes, it helps to draw the Lewis structure to see whether the molecule is polar. This can be done by observing the dipole movements and seeing if they cancel out in a symmetrical molecule.
by emilie liu 3G
Sun Nov 27, 2016 11:36 pm
Forum: *Titrations & Titration Calculations
Topic: Significant Figures in Equilibrium calculations
Replies: 3
Views: 413

Re: Significant Figures in Equilibrium calculations

I understand the rules of significant figures. I was asking if we simply carry all the significant figures and round at the end like usual or round at each individual step because the solution manual and practice finals derive their answers by rounding each individual step. When I followed the usual...
by emilie liu 3G
Sun Nov 27, 2016 10:13 am
Forum: *Titrations & Titration Calculations
Topic: Significant Figures in Equilibrium calculations
Replies: 3
Views: 413

Significant Figures in Equilibrium calculations

When calculating pH in titrations of buffers, should we still follow the rule where we carry all significant figures and round at the end? I have been doing some practice problems using that rule and have been off a tenth or two usually. When I look at the solutions manual and practice finals, it lo...
by emilie liu 3G
Sun Nov 20, 2016 1:47 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: 11.45 part C
Replies: 1
Views: 260

Re: 11.45 part C

Cl2 is more stable because the equilibrium constant is smaller than the equilibrium constant for F2. This means that products are less favored for Cl2 than they are for F2. Thus Cl2 would disassociate less than F2 and is therefore the more stable species.
by emilie liu 3G
Sun Nov 13, 2016 1:22 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Writing the formula for coordination compounds
Replies: 1
Views: 231

Re: Writing the formula for coordination compounds

The reason that in Pentaamminesulfatocobalt(III)chloride the (III) is included in the name but not the formula, is that the (III) represents the 3+ charge on the cobalt. You would use this charge to determine has many chlorines are attached to the compound in order to create a neutral compound.
by emilie liu 3G
Sun Nov 06, 2016 8:03 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Questions 4.77
Replies: 2
Views: 235

Re: Questions 4.77

c.) they differ because in HF the Fluorine uses its 2p orbital to construct the orbitals while in the H2 molecule the two hydrogens use their 1s orbital
by emilie liu 3G
Sun Oct 30, 2016 12:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: What is Angular? And what is T-shaped?
Replies: 2
Views: 368

Re: What is Angular? And what is T-shaped?

Yes, angular is the same as bent. T-shaped is a compound with 3 bonds and and 2 lone pairs.
by emilie liu 3G
Sun Oct 23, 2016 3:44 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: What is an ns-orbital?
Replies: 1
Views: 853

Re: What is an ns-orbital?

Yes, they are referring to the s orbital, the donut shaped one containing a maximum of 2 electrons. The n refers to the principle quantum number aka the shell number.
by emilie liu 3G
Mon Oct 17, 2016 8:25 am
Forum: Ionic & Covalent Bonds
Topic: Metallic bonds, Lewis Structures
Replies: 2
Views: 319

Re: Metallic bonds, Lewis Structures

For the second question, if you look at the course reader on page 1 of the chemical bonds section, when writing the Lewis symbols for a single element like one Helium, the two electrons are paired on one side of the diagram to represent 2 paired electrons in the 1s orbital. But for more complex Lewi...
by emilie liu 3G
Sun Oct 09, 2016 2:50 pm
Forum: Molarity, Solutions, Dilutions
Topic: Quiz Prep: Fall 2014 #4 [ENDORSED]
Replies: 2
Views: 313

Re: Quiz Prep: Fall 2014 #4 [ENDORSED]

Use the equation for dilutions: M1V1=M2V2
When substituting values you should get (.642M)(xL)=(1.00L)(0.101M)
Solve for xL
by emilie liu 3G
Sun Oct 02, 2016 3:04 pm
Forum: Properties of Light
Topic: Self Test 1.5A: Calculating longest wavelength given work function [ENDORSED]
Replies: 2
Views: 678

Re: Self Test 1.5A: Calculating longest wavelength given work function [ENDORSED]

First convert the work function of zinc from eV to joules using dimensional analysis. Because you are looking for the longest wavelength, set Ek = 0. When you substitute this into the equation Ek= hv - work function, you will get the equation hv = work function. Then, manipulate the equation c = wav...
by emilie liu 3G
Sun Sep 25, 2016 5:52 pm
Forum: Empirical & Molecular Formulas
Topic: Calculating Molecular and Empirica Formulas
Replies: 5
Views: 704

Calculating Molecular and Empirica Formulas

When calculating an empirical or molecular formula, after we convert grams to moles and divide each value by the lowest integer to calculate the mole to mole ratio, how close should we be to a whole number in order to round to the nearest whole number vs multiplying by a factor. For example, if afte...

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