Search found 20 matches

by Jenny_Luu_2A
Sun Mar 19, 2017 9:00 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Bond Angles of equatorials and axials
Replies: 3
Views: 669

Re: Bond Angles of equatorials and axials

If the problem asks for the mot stable conformation, then you want to put the biggest substituents of the cyclohexane on the equatorial position.
by Jenny_Luu_2A
Sun Mar 19, 2017 8:35 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7741
Views: 1058369

Re: Post All Chemistry Jokes Here

Two atoms are walking down the street.
Says one atom to the other, "Hey I think I lost an electron!"
The other says, "Are you sure?"
"Yes, I'm positive!"
by Jenny_Luu_2A
Sun Mar 19, 2017 8:32 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7741
Views: 1058369

Re: Post All Chemistry Jokes Here

Q: What animal is made up of calcium, nickel and neon?
A: A CaNiNe
by Jenny_Luu_2A
Sun Mar 19, 2017 8:26 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7741
Views: 1058369

Re: Post All Chemistry Jokes Here

Q: What do you do with a sick chemist?
A: If you can't helium, and you can't curium, then you might as well barium.
by Jenny_Luu_2A
Sun Mar 19, 2017 8:25 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7741
Views: 1058369

Re: Post All Chemistry Jokes Here

Did you know that you can cool yourself to -273.15˚C and still be 0k?
by Jenny_Luu_2A
Sun Mar 19, 2017 8:20 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7741
Views: 1058369

Re: Post All Chemistry Jokes Here

Q: How did the chemist survive the famine?
A: By subsisting on titrations.
by Jenny_Luu_2A
Sun Mar 19, 2017 8:11 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7741
Views: 1058369

Re: Post All Chemistry Jokes Here

Q: What happened to the man who was stopped for having sodium chloride and a nine-volt in his car?
A: He was booked for a salt and battery.
by Jenny_Luu_2A
Sun Mar 19, 2017 7:40 pm
Forum: Resonance in Organic Compounds
Topic: writing reaction rate laws [ENDORSED]
Replies: 4
Views: 1662

Re: writing reaction rate laws [ENDORSED]

If it doesn't cancel out then it is okay.
by Jenny_Luu_2A
Thu Mar 16, 2017 9:42 am
Forum: *Alkenes
Topic: Alkenes and Functional Groups
Replies: 4
Views: 765

Re: Alkenes and Functional Groups

It would still be a pentane, any double bonds that are part of a functional group are only considered as part of that functional group. If you had a double bond elsewhere, that is when you change the name of the alkane to an alkene.
by Jenny_Luu_2A
Mon Mar 06, 2017 2:04 pm
Forum: *Free Energy of Activation vs Activation Energy
Topic: equation derivation
Replies: 1
Views: 725

equation derivation

How is the equation Ea=delta H of activation + RT derived?
by Jenny_Luu_2A
Mon Mar 06, 2017 1:23 pm
Forum: *Alkanes
Topic: Drawing/Labeling reaction profile
Replies: 3
Views: 348

Re: Drawing/Labeling reaction profile

You would be able to tell that the reaction is exothermic precisely because the reactants have a higher energy level than the products do. In an exothermic reaction, energy is released when you form bonds. And when bonds are formed to make products, they are going to be more stable than the reactant...
by Jenny_Luu_2A
Thu Mar 02, 2017 2:20 pm
Forum: *Organic Reaction Mechanisms in General
Topic: the line with two crosses
Replies: 1
Views: 219

Re: the line with two crosses

I think it is the delta G/H, etc of the transition state.
by Jenny_Luu_2A
Thu Mar 02, 2017 2:17 pm
Forum: *Organic Reaction Mechanisms in General
Topic: HBr example from lecture
Replies: 2
Views: 358

Re: HBr example from lecture

In this electrophilic addition example, I think the order does matter, because there are two transition states that need to be drawn for the two steps of the reaction. The nucleophile is first the hydrocarbon, so a pair of electrons goes toward the partially positive hydrogen in the electrophile HBr...
by Jenny_Luu_2A
Thu Feb 23, 2017 3:41 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7741
Views: 1058369

Re: Post All Chemistry Jokes Here

Q: What happened to the man who was stopped for having sodium chloride and a nine-volt in his car?
A: He was booked for a salt and battery.
by Jenny_Luu_2A
Wed Feb 08, 2017 10:43 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7741
Views: 1058369

Re: Chemistry Jokes

A small piece of sodium that lived in a test tube fell in love with a Bunsen burner. "Oh Bunsen, my flame," the sodium pined. "I melt whenever I see you," The Bunsen burner replied, "It's just a phase you're going through."
by Jenny_Luu_2A
Thu Jan 26, 2017 6:15 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Equipartition Theorem
Replies: 2
Views: 407

Equipartition Theorem

Can someone explain the equipartition theorem and its applications?
by Jenny_Luu_2A
Wed Jan 18, 2017 2:44 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Work Integral Negative? [ENDORSED]
Replies: 2
Views: 336

Re: Work Integral Negative? [ENDORSED]

When the system is compressed, the formula has a negative sign and when the system is expanded it has a positive sign.
by Jenny_Luu_2A
Sun Jan 15, 2017 6:59 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy of Phase Changes
Replies: 2
Views: 279

Re: Enthalpy of Phase Changes

What about enthalpy being a state property makes it so that the reverse and forward processes for enthalpy changes are equal but with opposite signs?
by Jenny_Luu_2A
Fri Jan 13, 2017 10:59 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 7
Views: 466

Re: Bond Enthalpies

In using this method, when a bond is formed do we write it as negative energy, and when a bond is broken, we write it as positive energy to add them up?

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