Search found 18 matches

by Isa AbdulCader 3K
Sun Mar 13, 2016 11:44 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Drawing hydrogens
Replies: 2
Views: 462

Re: Drawing hydrogens

It would be safer to draw out the hydrogens, but if you do, make sure to be careful what direction you draw them in. Make sure to make the axial/equatorial differences visible, with alternating up/down between each.
by Isa AbdulCader 3K
Sat Mar 12, 2016 9:38 pm
Forum: *Cycloalkanes
Topic: Z vs E for cycloalkane with one substituent
Replies: 1
Views: 514

Z vs E for cycloalkane with one substituent

In Winter 2012 Final Exam, on Problem 5 Part II, it asks for the IUPAC name of molecule B, which is Z-cyclooct-4-enone. How is it considered cis- when there is only one substituent? Does the naming just default to Z when there is only one? Side question, what do you name (Z/E) when it is ambiguous (...
by Isa AbdulCader 3K
Tue Mar 08, 2016 5:28 pm
Forum: *Alkanes
Topic: Alphabetical order for multiples
Replies: 2
Views: 451

Alphabetical order for multiples

When you have for example, X,Y-dimethyl and Z-ethyl, which has alphabetical priority? Is it the D in dimethyl, or E in ethyl being before the M in methyl assuming the prefix isn't factored into alpha order? Also, what do you call it when there is a di/tri-methyl in a compound (I referred to it as mu...
by Isa AbdulCader 3K
Mon Mar 07, 2016 10:03 am
Forum: *Cycloalkanes
Topic: Naming for multiple cycloalkanes
Replies: 2
Views: 436

Naming for multiple cycloalkanes

How does the naming process work when there are multiple cycloalkanes of the same size? How do you prioritize which is the parent/which is the substituent, or is there a different approach? Thanks
by Isa AbdulCader 3K
Mon Feb 29, 2016 3:02 pm
Forum: *Alkanes
Topic: Cycloalkanes
Replies: 2
Views: 337

Re: Cycloalkanes

Cycloalkanes also appear in ringlike structures, with cyclopropane appearing as a triangle, and cyclopentane as a pentagon (just as examples).
by Isa AbdulCader 3K
Mon Feb 22, 2016 8:44 am
Forum: *Electrophiles
Topic: Why is F electrophile?
Replies: 5
Views: 1105

Re: Why is F electrophile?

F with 7 electrons has a net neutral charge, but it wants to complete its valence orbital with one more electron. The attraction of this electron makes it an electrophile. Once it has 8 electrons and a net negative charge of one, it is no longer an electrophile.
by Isa AbdulCader 3K
Mon Feb 08, 2016 2:26 pm
Forum: Balancing Redox Reactions
Topic: Coulomb
Replies: 4
Views: 677

Re: Coulomb

A coulomb is an SI unit of charge, as 1C = 1A x 1s, the charge transported at a constant current one ampere in one second, and is equivalent to the charge of 6.242x10^18 electrons
by Isa AbdulCader 3K
Fri Jan 29, 2016 12:12 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Calculating Standard Molar Entropy
Replies: 1
Views: 956

Calculating Standard Molar Entropy

Is there a way to calculate the standard molar entropy of a molecule without being given any information except the standard Gibbs free energy? Thanks
by Isa AbdulCader 3K
Wed Jan 20, 2016 2:12 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Enthalpy in a System
Replies: 2
Views: 503

Re: Enthalpy in a System

It is similar to the law of conservation of energy, in that the energy transfered (from surroundings to system or vice versa) has to be equal to the energy lost in that process.
by Isa AbdulCader 3K
Mon Jan 11, 2016 2:31 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8252
Views: 1444753

Re: Chemistry Jokes

What was the chemist's favorite attraction at the fair?

The ferrous wheel
by Isa AbdulCader 3K
Mon Jan 11, 2016 2:27 pm
Forum: Phase Changes & Related Calculations
Topic: Change from Graphite to Diamond
Replies: 2
Views: 459

Change from Graphite to Diamond

Why is it that graphite forming into diamond is an exothermic process? Are diamonds less stable than graphite despite being so structured? Thanks
by Isa AbdulCader 3K
Sat Dec 05, 2015 11:28 pm
Forum: Naming
Topic: Order of ligands
Replies: 2
Views: 511

Re: Order of ligands

To add onto that, when you writing out the name, not formula, you name ligands by alphabetical order (not including prefix). So penta-ammine would still come before cyano-
by Isa AbdulCader 3K
Mon Nov 09, 2015 12:33 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Precipitate
Replies: 3
Views: 420

Re: Precipitate

A precipitate usually forms when a molecule that can dissolve in water is present, and when the solution is saturated (it hits the maximum amount of dissolved solute), then the rest of the molecule that is added remains as a solid. This can also occur after a reaction and a non-soluble molecule is c...
by Isa AbdulCader 3K
Wed Nov 04, 2015 3:08 pm
Forum: Octet Exceptions
Topic: Boron Octet Exception HW 4.81
Replies: 2
Views: 697

Re: Boron Octet Exception HW 4.81

Yes, as having a completed octet is of higher priority in Lewis structures than balancing the FC. Have all atoms with filled valences first, and then balance FC to the best amount possible.
by Isa AbdulCader 3K
Wed Oct 28, 2015 11:03 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Electron Configuration
Replies: 2
Views: 451

Re: Electron Configuration

I don't believe it matters between px and py, but I think that pz is generally assumed to be the sigma orbital, being the one that is in line between the two nuclei.
by Isa AbdulCader 3K
Tue Oct 20, 2015 10:07 pm
Forum: Formal Charge and Oxidation Numbers
Topic: O having higher FC than N
Replies: 1
Views: 417

O having higher FC than N

Why is it that in [NO]+, there is a triple bond where N has an FC of 0 and O has an FC of +1 when O is more electronegative? Why doesn't it form a double bond so that N has the higher FC and O is at 0? For reference, this is 3.48.a, thanks.
by Isa AbdulCader 3K
Mon Oct 19, 2015 10:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shape under increased energy
Replies: 1
Views: 316

Shape under increased energy

Since the shapes (for example, tetrahedral) are in the lowest energy form, where equal electron densities are equally spread apart (at 109.5 degrees), what happens when there is an increase in energy? Can the molecule in a tetrahedral form undergo changes to the angles as energy increases, similarly...
by Isa AbdulCader 3K
Sat Oct 17, 2015 7:47 pm
Forum: Empirical & Molecular Formulas
Topic: Compounds burned in Air
Replies: 2
Views: 507

Re: Compounds burned in Air

To add onto the previous response, you cannot always assume that since the g of the initial compound are given it is composed of C, H, and O. In order to determine if there is any O present in the substance being burned, you have to calculate the moles of C and H present as a result of the combustio...

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