Search found 10 matches

by vanessachin2h
Mon Mar 07, 2016 3:01 pm
Forum: *Chem3D
Topic: Types of strain
Replies: 3
Views: 1078

Re: Types of strain

There is also bond angle strain, which is when a molecule's bond angels are not ideal.
by vanessachin2h
Mon Feb 29, 2016 3:28 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Intermediates
Replies: 1
Views: 375

Re: Intermediates

For electrophilic addition reaction, there are two transition states and one intermediate. Looking at an energy profile for this type of reaction (http://chemwiki.ucdavis.edu/@api/deki/files/1618/=Reaction_Coordinate_(1"onclick="window.open(this.href);return false;).gif?revision=1), you can see two ...
by vanessachin2h
Thu Feb 25, 2016 10:06 pm
Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Topic: Tert vs neo
Replies: 2
Views: 428

Re: Tert vs neo

"Tert" is used when a carbon is attached to three other carbons. "Neo" is used when a substituent whose second-to-last carbon of the chain has three methyl groups attached to it.
by vanessachin2h
Wed Feb 17, 2016 5:02 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: bond enthalpies
Replies: 2
Views: 447

Re: bond enthalpies

Another way to think about it is that the average bond enthalpy for breaking a single c-c bond is 348 kj/mol, whereas the average bond enthalpy for breaking a double c=c bond is 614 kj/mol. The c-c bond enthalpy is not exactly half of the c=c bon enthalpy.
by vanessachin2h
Mon Feb 08, 2016 8:38 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G equal maximum work
Replies: 2
Views: 1074

Re: Delta G equal maximum work

The negative value of delta G represents the amount of free energy the system releases. The released free energy is the amount of energy available to do work.
by vanessachin2h
Wed Feb 03, 2016 2:56 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Residual Entropy
Replies: 1
Views: 400

Re: Residual Entropy

For residual entropy, use S=(kb)ln(W), where W is degeneracy or the number of ways to to achieve a given energy state. W is the number of ways to achieve the given energy state raised to the number of particles or Avogadro's number.
by vanessachin2h
Mon Jan 25, 2016 11:04 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpy
Replies: 3
Views: 504

Re: Bond Enthalpy

Make sure you balance the equation first and also divide your final answer by 2, so your calculation is for 1 mole of Butane. 2(C4H10)+13(O2)-->8(CO2)+10(H2O) These were the my calculations: Bonds broken: 16776 C-H (412x10x2) C-C (348x3x2) O=O (496x13) Bonds formed: 21148 C=O (743x2x8) O-H (463x2x10...
by vanessachin2h
Fri Jan 22, 2016 12:04 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Cp,m
Replies: 2
Views: 1339

Re: Cp,m

I think the "m" stands for melting or fusion, so Cp,m is the molar heat capacity of a substance that is changing states, specifically going from a solid to a liquid.
by vanessachin2h
Wed Jan 13, 2016 3:22 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: reversible and irreversible process
Replies: 3
Views: 452

Re: reversible and irreversible process

An irreversible process is not in equilibrium, whereas a reversible process is at equilibrium. A reversible process does more work than an irreversible process.
by vanessachin2h
Fri Jan 08, 2016 5:20 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy Units
Replies: 2
Views: 628

Re: Enthalpy Units

Enthalpy values from tables are given in kJ/mol. The standard enthalpy of formation will always have the units kJ/mol because by definition, it is “the standard reaction enthalpy for the formation of ONE MOLE of a substance from its elements in their most stable form.” The coefficient for the produc...

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