Search found 12 matches

by Helen_Lee_1L
Sat Mar 18, 2017 3:33 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1013681

Re: Post All Chemistry Jokes Here

A photon checks into a hotel and is asked if he needs any help with his luggage. He says, "No, I'm traveling light."
by Helen_Lee_1L
Fri Mar 03, 2017 1:07 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1013681

Re: Post All Chemistry Jokes Here

Person 1: Hey, what was on the organic chemistry test?
Person 2: There were alkynes of problems.
by Helen_Lee_1L
Fri Feb 24, 2017 9:56 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1013681

Re: Post All Chemistry Jokes Here

Why can't ammonia get any girlfriends?

Because he's so basic.
by Helen_Lee_1L
Sun Jan 29, 2017 8:14 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Adiabatic Expansion Question
Replies: 1
Views: 229

Adiabatic Expansion Question

In an adiabatic expansion, the volume goes from 1 Liters to 2.56 Liters at an external pressure of 1 atm. It releases 73J of heat at 1 atm, and returns to its original delta U. Find final volume. So I understand that in an adiabatic expansion q=0, and so delta U equals work. Therefore, work (w) equa...
by Helen_Lee_1L
Thu Jan 19, 2017 12:52 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated Systems [ENDORSED]
Replies: 2
Views: 380

Isolated Systems [ENDORSED]

Are there other examples of isolated systems other than bomb calorimeters?
by Helen_Lee_1L
Fri Jan 13, 2017 6:01 pm
Forum: Phase Changes & Related Calculations
Topic: Path dependent property
Replies: 1
Views: 211

Path dependent property

In the course reader, it says that work (w) and heat (q) depend on the path taken, and therefore are not state properties. So, my question is, what does it mean to be path dependent?
by Helen_Lee_1L
Fri Nov 18, 2016 12:40 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Bronsted Acids Clarification
Replies: 1
Views: 288

Bronsted Acids Clarification

Why are all molecules that have a carboxyl group (COOH) weak acids?
by Helen_Lee_1L
Thu Nov 10, 2016 5:14 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1013681

Re: Post All Chemistry Jokes Here

For people who have a general knowledge of mainstream music:
What is David Guetta's favorite element?
Titanium
by Helen_Lee_1L
Thu Nov 10, 2016 5:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Solids in Equilibrium Reactions
Replies: 1
Views: 208

Solids in Equilibrium Reactions

In the course reader, it says that "molar concentration of a pure substance (solid or liquid) does not change in a reaction." However, during lecture, Professor Lavelle mentioned that solids do not show up in equilibrium reactions. Can anyone explain to me why this rule exists? Thank you!
by Helen_Lee_1L
Wed Oct 19, 2016 12:46 pm
Forum: Ionic & Covalent Bonds
Topic: Difference in Electronegativity [ENDORSED]
Replies: 3
Views: 631

Difference in Electronegativity [ENDORSED]

So I know that if the electronegativity difference > 2, then it's considered an ionic bond. And that if the electronegativity difference <1.5, then it's considered a covalent bond. What if the electronegativity difference is between the intervals of 1.5 and 2? How do you determine if the heteronucle...
by Helen_Lee_1L
Tue Oct 04, 2016 4:45 pm
Forum: Limiting Reactant Calculations
Topic: Reaction Stochiometry L.3 [ENDORSED]
Replies: 3
Views: 799

Re: Reaction Stochiometry L.3 [ENDORSED]

Thank you so much! :) Makes so much more sense now!
by Helen_Lee_1L
Mon Oct 03, 2016 5:31 pm
Forum: Limiting Reactant Calculations
Topic: Reaction Stochiometry L.3 [ENDORSED]
Replies: 3
Views: 799

Reaction Stochiometry L.3 [ENDORSED]

L.3 Compounds that can be used to store hydrogen in vehicles are being actively sought. One reaction being studied for hydrogen storage is Li3N + 2 H2 ---> LiNH2 + 2 LiH. (a) What amount (in moles) of H2 is needed to react with 1.5 mg of Li3N? (b) Calculate the mass of Li3N that will produce 0.650 m...

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