Search found 9 matches

by 204863791
Mon Mar 13, 2017 1:06 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: entropy formula for change in volume
Replies: 2
Views: 344

Re: entropy formula for change in volume

When do I use 5/2*R and 7/2*R? To find deltaS= nRlnV2/V1 but I know there are some situations where we use deltaS=n*(5/2)*R*lnV2/V1 or the same equation but with (7/2)
by 204863791
Sun Mar 05, 2017 8:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 20031

Re: Quiz 3 Winter 2017

I've been studying the textbook as well as the course reader but I can't find the section concerning the transitions.... which pages can I find them on?
by 204863791
Sun Feb 26, 2017 9:26 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Lines in Lewis Structures
Replies: 2
Views: 3228

Re: Lines in Lewis Structures

So at the end of the two "triangle" bolded and striped, there is a Carbon Atom. This Lewis structure also gives us the structure in 3D; the bolded triangle means that the atom attached to its end is towards the front while the atom attached to the striped triangle is towards the back. Ther...
by 204863791
Sun Feb 26, 2017 9:22 pm
Forum: General Science Questions
Topic: Gases in Atmosphere
Replies: 1
Views: 372

Gases in Atmosphere

If O_3 is heavier than O_2, how come we find O_3 in the upper atmosphere?
by 204863791
Sun Feb 12, 2017 7:05 pm
Forum: Balancing Redox Reactions
Topic: Adding H20 AND H+
Replies: 3
Views: 1132

Re: Adding H20 AND H+

When balancing our redox reaction (by adding H2O, H+, and OH-) can we use the couple H2O/H+ for reactions in an acidic and basic solution both or do we have to use OH- instead of H+ when working with a chemical reaction done in a basic solution?
by 204863791
Sun Feb 05, 2017 11:41 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Bond Enthalpies
Replies: 7
Views: 690

Re: Bond Enthalpies

What is the difference between reaction enthalpy and standard formation enthalpy? How can we tell the difference in a reaction?
by 204863791
Sun Jan 29, 2017 3:50 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8223
Views: 1435204

Re: Post All Chemistry Jokes Here

What happens to Nitrogen when the sun sets?
It becomes daytrogen and goes to bed. Good nitrogen, sleep tightrogen, don't let the bed bugs bitrogen.
by 204863791
Fri Jan 20, 2017 6:42 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 8
Views: 1922

Sig Figs

Can anyone explain to me what sig figs are and how they work?
by 204863791
Sun Jan 15, 2017 1:18 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Constant pressure and volume
Replies: 1
Views: 264

Re: Constant pressure and volume

Heat capacity is greater for a system with constant pressure because more heat needs to be added to that type of system to be able to get the increase in temperature when compared to a system with constant volume.

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