Search found 14 matches

by Trixie Le 3K
Tue Mar 08, 2016 1:25 pm
Forum: Calculating Work of Expansion
Topic: Enthalpy and Work
Replies: 1
Views: 332

Re: Enthalpy and Work

Sorry, I meant to say reversible process, not irreversible system. Moreover, can there be an enthalpy change in a bomb calorimeter since a bomb calorimeter only implies that the system will be at a constant volume?
by Trixie Le 3K
Tue Mar 08, 2016 1:23 pm
Forum: Calculating Work of Expansion
Topic: Enthalpy and Work
Replies: 1
Views: 332

Enthalpy and Work

Since enthalpy is the exchange of heat at a constant pressure, is it possible for there to be an enthalpy change in an irreversible system since the pressure is constantly being adjusted slowly?
by Trixie Le 3K
Thu Mar 03, 2016 8:12 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: Cis and Trans
Replies: 1
Views: 360

Re: Cis and Trans

When you have a double carbon bond, there are usually two ways in which it can be shaped. So you look at the two carbons and the two groups attached to the carbons. Compare the two groups that are attached to the carbons. You must compare the one carbon and determine which attached group is heavier ...
by Trixie Le 3K
Sat Feb 27, 2016 1:32 am
Forum: *Alkanes
Topic: Common Names
Replies: 1
Views: 290

Re: Common Names

it is but- because it has four carbons total, i think when naming it a common name such as iso, sec, and tert, you count the number of carbons overall of that certain structure. 2 methyl propane is also a valid name as well, and thats just naming it by the IUPAC way rather than the common way
by Trixie Le 3K
Sat Feb 20, 2016 12:54 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Pre-Equilibrium and Elementary Reactions
Replies: 1
Views: 405

Re: Pre-Equilibrium and Elementary Reactions

For this one the net rate of formation of O atoms is 0 because you know that this is the intermediate, which is formed and then decomposed, meaning that in the overall reaction there is no O in it. That is why O= k1[O3] - k1'[O2][O] - k2[O][O3}=0 because there is no O in the overall reaction. Then f...
by Trixie Le 3K
Sun Feb 14, 2016 1:05 pm
Forum: First Order Reactions
Topic: textbook number 15.29??
Replies: 2
Views: 505

Re: textbook number 15.29??

For this problem it asks what happens after the concentration increases to 0.018 M B, and since the reaction is A --> 3B + C, and you're doing everything by the reactant A since initial reactant A is 0.015M. What that means is how much of reactant A has reacted with reactant B so since there are 3 m...
by Trixie Le 3K
Fri Feb 05, 2016 12:29 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free energy in a nutshell?
Replies: 1
Views: 535

Re: Gibbs Free energy in a nutshell?

Gibbs free energy is something that combines the component of entropy and enthalpy to tell whether a reaction is likely to naturally happen in nature, or whether it needs an outside source of energy to happen. The change in Gibbs free energy is defined as the deltaH - T(delta)S which combines both t...
by Trixie Le 3K
Thu Jan 28, 2016 8:05 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: q and w in a reversible process
Replies: 1
Views: 543

Re: q and w in a reversible process

No, not necessarily. q = -w when it is an isothermal reversible process because the change in internal energy of an isothermal reversible process is 0 and (change in internal energy) = q +w and if q + w =0 then therefore you can transform the equation into q=-w because the temperature and internal e...
by Trixie Le 3K
Sun Jan 24, 2016 2:49 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Homework 9.19
Replies: 1
Views: 402

Re: Homework 9.19

The water is heated up to 100 C because that is the boiling point of water where water turns from liquid to gas. There is a change because the question asks for the standard enthalpy of vaporization of water at 85 C, which implies that it was a liquid that was heated up to 100C (accompanied by entro...
by Trixie Le 3K
Sun Jan 17, 2016 12:40 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: bond enthalpy
Replies: 1
Views: 395

Re: bond enthalpy

Benzene requires a different value because of the resonance of benzene. Since benzene has multiple trigonal planars that can form both pi bonds and omega bonds, those bonds overlap and then it becomes almost a cylinder shape and it becomes planar. Moreover, the resonance of benzene is the average of...
by Trixie Le 3K
Fri Jan 08, 2016 5:41 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Heat vs Work
Replies: 1
Views: 279

Re: Heat vs Work

Heat is the energy transferred as a result of a temperature difference and occurs when an object or system is in contact with something of a different temperature. When one object has more thermal energy interacts with a different object with less thermal energy, the molecules of the object with hig...
by Trixie Le 3K
Wed Jan 06, 2016 8:59 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Understanding Bond Enthalpies
Replies: 3
Views: 2347

Re: Understanding Bond Enthalpies

We are actually just adding up all the enthalpies of the equation, and in some cases some enthalpy values may be negative or positive depending upon whether it is an endothermic or exothermic reaction happening with that bond. In this case, breaking bonds is often endothermic, meaning that the value...
by Trixie Le 3K
Sat Oct 10, 2015 10:34 pm
Forum: Photoelectric Effect
Topic: Intensity with photoelectric effect
Replies: 1
Views: 443

Intensity with photoelectric effect

I know that increasing intensity does not matter regarding the photoelectric effect and if it did, then it would act like a wave in that sense. How would it act like a wave if intensity did affect the capability of the photons to eject electrons?

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