Search found 20 matches

by Darlene Fung 1J
Tue Mar 08, 2016 2:46 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Twist-Boat vs. Boat Conformation
Replies: 2
Views: 1427

Re: Twist-Boat vs. Boat Conformation

This link below shows the difference between twist boat and boat in terms of structure!

http://www2.volstate.edu/chem/2010/Labs/Molecular%20Models.html
by Darlene Fung 1J
Mon Feb 29, 2016 7:44 pm
Forum: *Electrophilic Addition
Topic: Electrophilic Addition vs. Nucleophilic Substitution
Replies: 1
Views: 354

Re: Electrophilic Addition vs. Nucleophilic Substitution

Bimolecular nucleophilic substitution is a one-step reaction because the nucleophile is replacing the leaving group in one step. Unimolecular nucleophilic substitution, however, is a two-step reaction where the leaving group detaches followed by the nucleophile replacing it.
by Darlene Fung 1J
Thu Feb 25, 2016 6:00 pm
Forum: *Alkenes
Topic: Naming alkenes
Replies: 3
Views: 449

Re: Naming alkenes

Yes, when the alkene carbon chain has four or more carbon atoms then the position of the double bond needs to be given in the name.
by Darlene Fung 1J
Fri Feb 19, 2016 2:54 pm
Forum: General Rate Laws
Topic: Half-Orders
Replies: 4
Views: 632

Re: Half-Orders

Yes I believe so.
by Darlene Fung 1J
Tue Feb 09, 2016 9:09 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Midterm 2014 Number 8
Replies: 1
Views: 322

Re: Midterm 2014 Number 8

I think it is because it is asking for the value of Ka for HF, so you want to get the overall rxn as HF = H+ + F-.
by Darlene Fung 1J
Sat Feb 06, 2016 12:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: work
Replies: 2
Views: 394

Re: work

In this case, the battery is the system. Since the system is doing work, work is negative.
by Darlene Fung 1J
Fri Jan 29, 2016 12:57 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: How to draw a heating curve?
Replies: 3
Views: 2310

Re: How to draw a heating curve?

The horizontal lines are the phase changes and the slopes are based off of the heat capacities. The x axis is the amount of heat inputted and the y axis is the temperature.
by Darlene Fung 1J
Fri Jan 22, 2016 4:36 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Expansion work
Replies: 4
Views: 590

Re: Expansion work

Yes it means that the volume doesn't change. Instead, work is done by heat.
by Darlene Fung 1J
Thu Jan 14, 2016 11:23 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: bomb calorimeter
Replies: 2
Views: 370

Re: bomb calorimeter

The combustion of glucose in a bomb calorimeter is isolated because no matter or energy can be exchanged with the environment.
by Darlene Fung 1J
Fri Jan 08, 2016 8:54 pm
Forum: Phase Changes & Related Calculations
Topic: Exothermic vs. Endothermic
Replies: 8
Views: 2398

Re: Exothermic vs. Endothermic

I believe this is an endothermic reaction because the ice pack takes up heat while the knee along with the surroundings will cool down.
by Darlene Fung 1J
Wed Dec 02, 2015 3:30 pm
Forum: Bronsted Acids & Bases
Topic: Metal oxides
Replies: 2
Views: 439

Re: Metal oxides

Yes.
MO +H2O = MOH
For example:
CaO + H2O = Ca(OH)2
by Darlene Fung 1J
Sat Nov 28, 2015 2:07 am
Forum: Lewis Acids & Bases
Topic: Strong Acid
Replies: 3
Views: 594

Re: Strong Acid

Table 12.3 lists strong acids.
by Darlene Fung 1J
Wed Nov 18, 2015 9:55 pm
Forum: Naming
Topic: Adding "-ate" to a metal
Replies: 5
Views: 851

Re: Adding "-ate" to a metal

You add "-ate" to the TM when the complex has a negative charge.
by Darlene Fung 1J
Fri Nov 13, 2015 1:12 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Determining the Coordination Number
Replies: 2
Views: 351

Re: Determining the Coordination Number

# of bonds = Coordination #
by Darlene Fung 1J
Thu Nov 05, 2015 5:24 pm
Forum: Lewis Structures
Topic: Lewis Structure of NO3-
Replies: 2
Views: 544

Re: Lewis Structure of NO3-

Because Oxygen is not in the 3rd period or below. Therefore it cannot hold more than 8 valence electrons and has to abide to the octet rule.
by Darlene Fung 1J
Thu Oct 29, 2015 12:41 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 3
Views: 1443

Re: Polarity

Isn't there some uncertainty to this? You can't say it is nonpolar because you don't know whether the 2 F atoms or the 2 Cl atoms are across from each other in order for them to cancel out.
by Darlene Fung 1J
Fri Oct 23, 2015 4:22 pm
Forum: Octet Exceptions
Topic: Why does Sulfur accommodate expanded octet?
Replies: 2
Views: 3761

Re: Why does Sulfur accommodate expanded octet?

Atoms of the third period and beyond can exceed the octet rule.
by Darlene Fung 1J
Thu Oct 15, 2015 7:50 pm
Forum: DeBroglie Equation
Topic: Finding wavelenght when speed is given [ENDORSED]
Replies: 5
Views: 1200

Re: Finding wavelenght when speed is given [ENDORSED]

Shouldn't it be 1.3 x 10^-31 m? Because if you convert 1.5 grams to kilograms, it becomes 1.5 x 10^-3 kg.
by Darlene Fung 1J
Fri Oct 09, 2015 11:43 pm
Forum: Properties of Light
Topic: Shorter vs Longer Wavelength
Replies: 6
Views: 1770

Re: Shorter vs Longer Wavelength

The smaller the wavelength, the larger the energy. The larger the wavelength, the smaller the energy.
by Darlene Fung 1J
Fri Oct 02, 2015 4:08 pm
Forum: Molarity, Solutions, Dilutions
Topic: Chromatography?
Replies: 2
Views: 588

Re: Chromatography?

Chromatography is a technique used to separate the different components of a mixture. This technique relies on the ability of different phases to absorb substances to different extents.

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