Search found 20 matches

by Jessie_Chen_2L
Mon Mar 13, 2017 9:27 am
Forum: *Ketones
Topic: Naming
Replies: 1
Views: 530

Re: Naming

I think it can be both.
by Jessie_Chen_2L
Mon Mar 06, 2017 9:32 am
Forum: *Cycloalkenes
Topic: Naming Cycloalkenes
Replies: 1
Views: 298

Re: Naming Cycloalkenes

You would go with the one with more carbons, so you would use the chain as the base of the name and you would name the cycloalkane as a substituent. For example if we had a cyclobutane and a heptane chain attached, you would say cyclobutylheptane, since the heptane is the longer carbon chain.
by Jessie_Chen_2L
Wed Mar 01, 2017 1:05 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1015464

Re: Post All Chemistry Jokes Here

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by Jessie_Chen_2L
Mon Feb 20, 2017 6:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Rate law of rxn mechanisms
Replies: 1
Views: 242

Re: Rate law of rxn mechanisms

According to the course reader, the pre-equilibrium approach is simpler, but less flexible. You also need the reaction before the rate limiting step is equilibrium. For the steady-state approach, the concentration of intermediate in the assumed to be constant.
by Jessie_Chen_2L
Mon Feb 13, 2017 1:18 pm
Forum: Phase Changes & Related Calculations
Topic: Equation to find standard reduction potentials?
Replies: 2
Views: 290

Re: Equation to find standard reduction potentials?

It is actually a table of values that they have found by experimentation when one is the standard hydrogen electrode.
by Jessie_Chen_2L
Mon Feb 06, 2017 1:37 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1015464

Re: Post All Chemistry Jokes Here

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by Jessie_Chen_2L
Mon Jan 30, 2017 9:24 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 3
Views: 314

Re: Bond Enthalpies

Yes, you would multiply the bond enthalpies by the number of moles so that you can find the total amount required to break and form all the bonds.
by Jessie_Chen_2L
Mon Jan 23, 2017 6:21 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 8.31 HW problem
Replies: 1
Views: 258

Re: 8.31 HW problem

For part a, the molar heat capacity of a monatomic ideal gas at constant pressure, like Kr(g), is C P,m = (5/2)R. To calculate the heat that is released, we use q = nC P,m (T final -T initial ) to get -90.6J. We have all the information because we can convert the gas to the amount of moles of gas an...
by Jessie_Chen_2L
Thu Jan 19, 2017 11:54 am
Forum: Phase Changes & Related Calculations
Topic: Different enthalpy of vaporizations for water
Replies: 3
Views: 267

Re: Different enthalpy of vaporizations for water

The standard state just means what phase the substance is at 1atm and at 25 degrees Celsius. For example, the standard state of water under these conditions would be liquid. If it's not at 1atm, then it's not in its standard state, so you would find the reaction enthalpy.
by Jessie_Chen_2L
Thu Jan 12, 2017 9:17 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1015464

Re: Post All Chemistry Jokes Here

"I don't trust atoms...they make up everything."
by Jessie_Chen_2L
Thu Dec 01, 2016 1:28 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Homework Help 12.69
Replies: 1
Views: 265

Re: Homework Help 12.69

The Cl ion does not affect the pH of the solution at all so we can just ignore it. Only the NH4 affects the pH because it can donate a proton to H2O.
by Jessie_Chen_2L
Fri Nov 25, 2016 3:54 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Indicators of strong or weak acid/base
Replies: 3
Views: 397

Indicators of strong or weak acid/base

Hi, I am still sort of confused as to how we can tell if an acid or a base is strong or weak and why most inorganic acids are strong compared to organic acids. I know that strong acids lose a proton easily and the resulting anion must be stable, but I remember that we can somehow tell from K a and K...
by Jessie_Chen_2L
Tue Nov 15, 2016 6:05 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1015464

Re: Post All Chemistry Jokes Here

A man walks into a bar. He says, "I'll have some H20."

The man next to him says, "I'll have some H20 too!", then drinks it and dies.
by Jessie_Chen_2L
Fri Nov 11, 2016 11:20 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: HW Problem 4.59.A
Replies: 1
Views: 241

Re: HW Problem 4.59.A

For all atoms with an atomic number less than 8 (so anything before oxygen), the pi orbital is more stable because it has less energy than the sigma orbitals for 2p, so they fill up first. For all atoms with an atomic number greater than or equal to 8, the sigma orbital fills up before the pi orbital.
by Jessie_Chen_2L
Thu Nov 03, 2016 11:13 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond order of B2 molecule
Replies: 1
Views: 17147

Re: Bond order of B2 molecule

The molecular orbital diagram for B 2 is http://img.sparknotes.com/figures/8/83ce1fb7be648ede5785ea60c96b495c/b2correlate.gif You can see that there are two electrons in the σ 2s and two electrons in the σ* 2s and two in the π 2p orbitals. We now know that there are two electrons in the antibonding ...
by Jessie_Chen_2L
Thu Oct 27, 2016 10:18 pm
Forum: Sigma & Pi Bonds
Topic: sigma/pi bonds [ENDORSED]
Replies: 1
Views: 294

Re: sigma/pi bonds [ENDORSED]

All of the single bonds are sigma bonds and for the double bond, one of the bonds is a pi bond.

For a single bond, there is a sigma bond.
For a double bond, there is a sigma bond and a pi bond.
For a triple bond, there is a sigma bond and two pi bonds.
by Jessie_Chen_2L
Tue Oct 18, 2016 12:46 am
Forum: Trends in The Periodic Table
Topic: Electron Affinity [ENDORSED]
Replies: 3
Views: 498

Re: Electron Affinity [ENDORSED]

Electron affinity is the amount of energy released when an electron is added to a gas-phase atom. A positive electron affinity means that energy is released when an electron is added. A negative electron affinity means that energy must be supplied for an atom to gain an electron.
by Jessie_Chen_2L
Thu Oct 13, 2016 8:07 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7582
Views: 1015464

Re: Post All Chemistry Jokes Here

I'm a female.
Fe = Female
Male = Man
Therefore, I am Iron Man.
by Jessie_Chen_2L
Thu Oct 06, 2016 4:28 pm
Forum: Properties of Light
Topic: Calculating Wavelength
Replies: 1
Views: 315

Re: Calculating Wavelength

We know that the frequency is 99.5 MHz, so you would be able to find the wavelength by using the equation .

Substitute in the speed of light for c and your frequency above (remember to convert to Hz) (1 MHz = 10^6 Hz) to find the wavelength.
by Jessie_Chen_2L
Fri Sep 30, 2016 3:16 pm
Forum: Properties of Light
Topic: Increasing Intensity in Photoelectric Effect [ENDORSED]
Replies: 9
Views: 979

Re: Increasing Intensity in Photoelectric Effect [ENDORSED]

Hi, from what I know, the threshold value is the minimum amount of energy it requires to remove an electron from the metal. It is also called the work function. And yes, the wavelength must be shorter to increase the frequency, which in turn increases the energy so that there is enough energy to rem...

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