Search found 20 matches

by E-Ming Huang 1L
Sun Mar 13, 2016 6:56 am
Forum: *Cycloalkenes
Topic: Q7A. 2011 Winter Final
Replies: 3
Views: 411

Re: Q7A. 2011 Winter Final

It is indicated in the answer. E-4-methylcyclopent-2-enol.
by E-Ming Huang 1L
Sun Mar 13, 2016 6:50 am
Forum: *Alkanes and Substituted Alkanes (Staggered, Eclipsed, Gauche, Anti, Newman Projections)
Topic: Positive/negative rotation?
Replies: 2
Views: 488

Re: Positive/negative rotation?

You rotate counter clockwise if its negative and clockwise if the angle is positive.
by E-Ming Huang 1L
Sun Feb 28, 2016 11:07 pm
Forum: *Alkanes
Topic: Structural Formulas
Replies: 2
Views: 234

Re: Structural Formulas

Unfortunately the only way is to draw the structures out or to be really familiar with the specific alkanes.
by E-Ming Huang 1L
Sun Feb 21, 2016 11:26 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Organic Reaction Mechanisms: 1e- movement
Replies: 1
Views: 231

Re: Organic Reaction Mechanisms: 1e- movement

The reason that we see transfers of two electrons most of the time is because there are really only about three types of electron transfers. Bond to bond, lone pair to bond, and bond to lone pair. All of these involves the transfers of two electrons. Half arrows are mostly used when the two electron...
by E-Ming Huang 1L
Sun Feb 14, 2016 6:42 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: zero order reaction
Replies: 2
Views: 518

Re: zero order reaction

Adding on to the above comment, zero-order reactions are independent of R because having a zero-order reaction means the rate is something like k*(concentration)^0 which equals k*1 which is simply a constant. The slope is going to be negative k because the concentration of the reactants is decreasing.
by E-Ming Huang 1L
Sun Feb 07, 2016 11:05 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 3
Views: 405

Re: Cell Diagrams

In the cell diagram, for the cathode, the product with the more electrons should be written last. For instance, Ag+ l Ag. The vice versa applies for the anode. Therefore, you always need to compare the products and reactants of the half-reactions to make sure you get the order of products and reacta...
by E-Ming Huang 1L
Sun Jan 31, 2016 10:31 pm
Forum: Balancing Redox Reactions
Topic: Nitric Acid and Metal
Replies: 2
Views: 290

Re: Nitric Acid and Metal

Can someone clarify for me why gold can't be dissolve by a single acid? Does this mean even a very strong concentration of nitric acid won't be able to dissolve gold?
by E-Ming Huang 1L
Sun Jan 24, 2016 8:08 pm
Forum: Phase Changes & Related Calculations
Topic: HW 8.43: Heating Curve
Replies: 1
Views: 294

Re: HW 8.43: Heating Curve

There is no y-intercept because having a y-intercept would mean the compound has a positive temperature even though there is no heat supplied to it which is not possible.
by E-Ming Huang 1L
Mon Jan 18, 2016 7:47 pm
Forum: Phase Changes & Related Calculations
Topic: Why does steam cause sever burns?
Replies: 4
Views: 444

Re: Why does steam cause sever burns?

This is because the process of Vapor--> Liquid is exothermic which means heat is released, burning the hand. On the top of p17 of your course reader, you can see that Liquid--> Vapor is endothermic. Therefore, the opposite process (Vapor --> Liquid) is exothermic.
by E-Ming Huang 1L
Sun Jan 10, 2016 10:50 pm
Forum: Phase Changes & Related Calculations
Topic: Phase Changes- Melting/Boiling
Replies: 4
Views: 534

Re: Phase Changes- Melting/Boiling

Keep in mind this only happens in theory though. In reality when you are heating a substance, usually, there's going to be certain spots that are hotter than others (spots closer to the heat source).
by E-Ming Huang 1L
Sun Dec 06, 2015 12:35 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: How do I know if an acid is weak
Replies: 3
Views: 841

Re: How do I know if an acid is weak

My TA said to just memorize the ones in the course-reader. So for strong acids, I would memorize HCl, HBr, HNO3, and H2SO4 as the strong acids. Weak acids would be H2CO3 and the C6H5COOH.

Strong bases would includes NaOH, CaO, Ca(OH)2 and Ba(OH)2
by E-Ming Huang 1L
Sun Nov 29, 2015 1:20 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: HF Acid
Replies: 3
Views: 501

Re: HF Acid

Keep in mind that polarity also affects bond strength. HF has a huge electronegativity difference which makes the bond very polar which also affects the strength of the molecules hold on the H.
by E-Ming Huang 1L
Sun Nov 22, 2015 9:57 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating Complex
Replies: 2
Views: 459

Re: Chelating Complex

You also have to check if the structure is stable to know if the chelating complex will work.
by E-Ming Huang 1L
Sun Nov 15, 2015 10:00 pm
Forum: Naming
Topic: Thiocyanato vs pentaaqua
Replies: 1
Views: 170

Re: Thiocyanato vs pentaaqua

It's a mistake in the book. Pentaaqua should've came first. The book was probably just trying to illustrate the thiocyanato-kS and thiocyanato-kN point in the toolbox and put thiocyanato first for "clarity".
by E-Ming Huang 1L
Sun Nov 08, 2015 6:44 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation State
Replies: 3
Views: 481

Re: Oxidation State

The oxidation state of an element is also determined by its electronegativity. More electronegative elements like oxygen generally gets negative oxidation state numbers. The less electronegative ones generally get positive oxidation states.
by E-Ming Huang 1L
Sun Nov 01, 2015 8:13 pm
Forum: Hybridization
Topic: Hybrid orbitals
Replies: 2
Views: 334

Re: Hybrid orbitals

Drawing the lewis structure of SF6, you will see that S has six single bonds in total. We know that you can have 1 s orbital, 3 p orbital and 5 d orbitals etc. So filling it in, we get the hybridization of sp3d2 (1s+3p+2d =6)
by E-Ming Huang 1L
Fri Oct 23, 2015 8:11 pm
Forum: Lewis Structures
Topic: Lewis structure
Replies: 3
Views: 484

Re: Lewis structure

For your example S2O2 2-, I would just put double bonds between all the atoms and it coincidentally uses all the 26 electrons.
by E-Ming Huang 1L
Sun Oct 18, 2015 6:15 pm
Forum: Ionic & Covalent Bonds
Topic: Breaking Bonds
Replies: 2
Views: 359

Re: Breaking Bonds

Most of the time, if you want to break the bonds in an already stabled atom, a large amount of energy is required since the atom wants to be in a stable state. Once broken, the atoms would be in an unstable state and would most likely react with something else to become stable again, kind of "r...
by E-Ming Huang 1L
Sun Oct 18, 2015 6:11 pm
Forum: Lewis Structures
Topic: Orientation of Atoms in Lewis Structures
Replies: 2
Views: 460

Re: Orientation of Atoms in Lewis Structures

Yep, it doesn't matter as long as the middle atom has the lowest ionization energy. Sometimes, we get same structures with differing arrangement of the atoms called isomers and this actually happens a lot with compounds made out of C, O and N.
by E-Ming Huang 1L
Sun Oct 04, 2015 2:05 pm
Forum: Properties of Light
Topic: Speed
Replies: 3
Views: 514

Re: Speed

My TA said that values like the speed of light is usually given on the quizzes and tests and we should just use the given values.

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