Search found 16 matches
- Sat Mar 12, 2016 2:00 am
- Forum: *Cycloalkenes
- Topic: Final 2012 Question 5
- Replies: 1
- Views: 563
Re: Final 2012 Question 5
A ring structure has the carbons on the inside of each bond. When a double bond locks it into place, the ring forms bonds on the same side of the bond and not on opposite sides. A ring that has a trans structure is often unstable and irregulary looking. All circular rings will have a cis structure.
- Thu Mar 10, 2016 2:45 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3006374
Re: Chemistry Jokes
After chemistry class, a student asks a chemist for help with regards to rate constants. The chemist, in response says "k" !
- Fri Mar 04, 2016 5:32 pm
- Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
- Topic: Priority Groups
- Replies: 1
- Views: 493
Re: Priority Groups
If two groups are the same, it would mean that both chains would have exactly the same formula, therefore, it would be labeled as a dichloro (for your example) or (something like )a diethyl group. Because of this, priority would not matter because the chains would be equal anyways. In the regards of...
- Fri Feb 26, 2016 1:21 pm
- Forum: *Cycloalkenes
- Topic: Numbering for Cycloalkenes
- Replies: 2
- Views: 1009
Re: Numbering for Cycloalkenes
Also, the length of the substituent doesn't matter, only the placement does. A methyl group holds the same numbering priority as a larger substituting such as an isopropyl or tert-pentyl group. But as always, this ordering still has a lower priority than making the double bonds as low of a number as...
- Fri Feb 26, 2016 1:16 pm
- Forum: *Cycloalkenes
- Topic: Numbering for Cycloalkenes
- Replies: 2
- Views: 1009
Re: Numbering for Cycloalkenes
Double bonds hold priority. The best way to name cycloalkenes is to have the double bonds have priority over the substituents. However, the double bond with the most substituants directly in front of it should get the lower number, hence making the most substituent groups have lower numbers. Of cour...
- Sun Feb 21, 2016 2:55 am
- Forum: *Organic Reaction Mechanisms in General
- Topic: Arrow Electron Flow Ex from Course Reader
- Replies: 2
- Views: 578
Re: Arrow Electron Flow Ex from Course Reader
I am also assuming that when a BOND is broken, 2 e- will be transferred and when there is just a single dot drawn in the Lewis structure then only that one e- will be transferred.
- Sun Feb 21, 2016 2:13 am
- Forum: *Organic Reaction Mechanisms in General
- Topic: Arrow Electron Flow Ex from Course Reader
- Replies: 2
- Views: 578
Re: Arrow Electron Flow Ex from Course Reader
2 electrons are being transferred if there is a double-headed arrow, and only one electron is being transferred if there is a single-headed arrow (pg. 86 course reader).
- Sun Feb 21, 2016 2:00 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: k and rate of reaction
- Replies: 1
- Views: 479
Re: k and rate of reaction
To find a rate, a specific reaction must be given, from which a rate law can be established. Then a k value must be found by by using the Arrhenius equation and then it can be related back into the Rate law derived from a given reaction.
- Thu Feb 18, 2016 2:15 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Quiz 1, Winter 2014 Solving for Activation Energy
- Replies: 4
- Views: 6005
Re: Quiz 1, Winter 2014 Solving for Activation Energy
Does R stand for Rate or Gas constant here?
- Sat Feb 13, 2016 2:33 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Rate law
- Replies: 2
- Views: 594
Re: Rate law
A rate law explains the rate of reactions according to parameters given. A differential rate law is helpful for explaining the rate at a certain time. The integrated rate law is helpful for finding a time where an amount of material exists and the 1/2 life laws help to explain half lives. All use co...
- Fri Feb 05, 2016 12:45 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: How to figure out Cathode and Anode Reactions?
- Replies: 1
- Views: 581
Re: How to figure out Cathode and Anode Reactions?
Oxidation occurs when a substance loses an electron. Therefore the charge increases. Reduction occurs where a substance gains an electron and reduces a substance's chemical charge. The half reactions show oxidation and reduction separately, both balanced seperately so that all of the e- cancel out o...
- Thu Jan 28, 2016 6:32 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpies
- Replies: 3
- Views: 816
Bond Enthalpies
For some reason I can never do these problems properly. For bond enthalpies, do the broken bonds have their values negated or do the formed bonds have their enthalphy negated? Sorry if it's a dumb question but thank you in advance everyone.
- Tue Jan 26, 2016 5:29 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Elements in their most stable form
- Replies: 2
- Views: 11580
Re: Elements in their most stable form
An element is in its most stable form if it is in its most pure/stable state (For example Fe(s), Na(s), He(g), H2(g), C(s) are all n their elemental forms). In liquid and solid forms, an elemental state is a pure block or substance containing only that element (like a block of pure iron, or a block ...
- Fri Jan 22, 2016 3:35 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reversible and Irreversible
- Replies: 1
- Views: 518
Re: Reversible and Irreversible
A reversible process is one that takes place in equilibrium and is a slow gradual change from one position to the next. Because it is a continuous change, it can be reversed with an opposite reaction. On the contrary, irreversible processes occur when there is a spontaneous action of some sort such ...
- Fri Jan 15, 2016 12:16 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat Capacity
- Replies: 3
- Views: 678
Re: Heat Capacity
I find Heat Capacity as being still useful even though it is an extensive property because it can be used to derive other more specific heat capacities. By placing a mass measure to the extensive property of Heat Capacity, other specific heat capacities can be derived according to the mass measure t...
- Fri Jan 08, 2016 1:51 am
- Forum: Phase Changes & Related Calculations
- Topic: +VE and phase change
- Replies: 2
- Views: 3944
+VE and phase change
I am a little unsure of what the term "+VE" (Course reader Pg 17) means. Also, if VE+ is the result of endothermic reactions, could the term change to be negative in the case of exothermic state changes (e.g. freezing/condensation/deposition), or does state change only yield a positive VE+...