Search found 22 matches

by Ivanna_Tang_3B
Thu Mar 16, 2017 9:28 pm
Forum: *Alcohols
Topic: 2013 final Q6B
Replies: 2
Views: 533

2013 final Q6B

Hello, how do we know that the common names are?
we can chose from cstearic acid, glycerin, and cetyl alcohol
Thank you!
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by Ivanna_Tang_3B
Sun Mar 12, 2017 11:57 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 887368

Re: Post All Chemistry Jokes Here

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by Ivanna_Tang_3B
Sun Mar 05, 2017 11:32 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: equilibrium, reversible, delta U
Replies: 1
Views: 301

equilibrium, reversible, delta U

I thought that I heard from or read somewhere that equilibrium meant that the reaction was also reversible and so delta U was equal to 0. but apparently that's not true? So how would we know when a reaction is reversible (without the problem specifically saying so) and therefore when delta U=0? than...
by Ivanna_Tang_3B
Sun Feb 26, 2017 11:52 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 887368

Re: Post All Chemistry Jokes Here

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credit to Bill Watterson, Calvin and Hobbes Cartoonist :)
by Ivanna_Tang_3B
Sun Feb 19, 2017 5:30 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 887368

Re: Post All Chemistry Jokes Here

A chemistry teacher is recruited as a radio operator in the first world war. He soon becomes familiar with the military habit of abbreviating everything. As his unit comes under a sustained enemy attack, he is asked to urgently inform his HQ. "NaCl over NaOH! NaCl over NaOH!" he says. &quo...
by Ivanna_Tang_3B
Tue Feb 14, 2017 1:34 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: midterm 2015 #4&5 B
Replies: 3
Views: 437

midterm 2015 #4&5 B

Ron mispronounces the spell, causing his balloon to expand uncontrollably. The balloon starts at 3.3 L and room temperature (298) but ends up at a whopping 9.2x10^5 L and 333K, forcing the entire class to flee the classroom. Calculate deltaS for Ron's balloon. Assume that Helium in the balloon is a ...
by Ivanna_Tang_3B
Mon Feb 13, 2017 11:48 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 2014 midterm #8
Replies: 4
Views: 392

2014 midterm #8

The question reads:
Using standard cell potentials:
F2+2H++2e--->2HF E=3.03V
F2+2e--->2F- E=2.87

How do we know which one will be the anode and which one will be the cathode, so we know which equation to flip?

question asks to calculate the Ka for HF.

Thank you!
by Ivanna_Tang_3B
Sat Feb 11, 2017 2:47 pm
Forum: Calculating Work of Expansion
Topic: quiz 1 #4, finding standard rxn enthalpy
Replies: 1
Views: 253

quiz 1 #4, finding standard rxn enthalpy

Quiz 1 #4 The question gives that, the formation of of lactic acid from glucose is C6H12O6-->2C3H6O3 and asks you to calculate the standard enthalpy change. I ended up with -113.8kJ and then divided by 2 to get -56.9kJ/mol. But this part was marked wrong, and apparently -113.8kJ is correct. Why am I...
by Ivanna_Tang_3B
Sun Feb 05, 2017 8:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: order of galvanic cell
Replies: 2
Views: 247

order of galvanic cell

How do we tell which are the reactants and products in a galvanic cell? is there a particular order?
For example,
C(gr)|H2(g)||H+(aq)||Cl-(aq)|Cl2(g)|Pt(s)
is products to reactants from inward to outward, or left to right?

Thank you!
by Ivanna_Tang_3B
Mon Jan 30, 2017 3:25 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 887368

Re: Post All Chemistry Jokes Here

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baby thermodynamics!
by Ivanna_Tang_3B
Sun Jan 22, 2017 11:13 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 887368

Re: Post All Chemistry Jokes Here

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by Ivanna_Tang_3B
Sun Jan 15, 2017 11:34 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 887368

Re: Post All Chemistry Jokes Here

What Happens To Nitrogen When The Sun Rises?

It becomes daytrogen
I’m going to bed.
Good nitrogen
Sleep tightrogen
Don’t let the bed bugs bitrogen
by Ivanna_Tang_3B
Sat Dec 03, 2016 8:35 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: 2014 final #8
Replies: 2
Views: 462

2014 final #8

A buffer solution of volume 300.0 mL is 0.200M CH3COOH and 0.300M NaCH3CO2. The pKa for acetic acid is 4.75. In part A, the initial pH of the solution is found to be 4.93. Part B asks: what mass of NaOH would have to be dissolved in this solution to bring the pH to 6.0? the solution writes: 6.0 = 4....
by Ivanna_Tang_3B
Sun Nov 27, 2016 11:27 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 887368

Re: Post All Chemistry Jokes Here

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by Ivanna_Tang_3B
Thu Nov 17, 2016 9:18 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 887368

Re: Post All Chemistry Jokes Here

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by Ivanna_Tang_3B
Sat Nov 12, 2016 1:46 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 887368

Re: Post All Chemistry Jokes Here

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by Ivanna_Tang_3B
Fri Nov 04, 2016 3:45 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 887368

Re: Post All Chemistry Jokes Here

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by Ivanna_Tang_3B
Mon Oct 24, 2016 11:04 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: when to switch pi and sigma in p-level
Replies: 1
Views: 376

when to switch pi and sigma in p-level

Hello, when drawing molecular orbital models, how do I know what order to draw the pi and sigma energy levels in the p-orbital (the left model or the right model)? and especially if the atoms are different. Thank you! https://scontent-sea1-1.xx.fbcdn.net/v/t34.0-12/14813726_1014482815330656_67949938...
by Ivanna_Tang_3B
Fri Oct 21, 2016 4:40 pm
Forum: Lewis Structures
Topic: Lewis structure of H3PO4
Replies: 1
Views: 245

Lewis structure of H3PO4

Is it more accurate to draw the Lewis structure of H3PO4 with ionic bonds since PO4^3- is a polyatomic ion, or better to draw it with covalent bonds? https://scontent.xx.fbcdn.net/v/t34.0-12/14798839_1011685678943703_1963603948_n.jpg?oh=24008ab39260f8109db496b0484e25fb&oe=580D1151 Thank you!
by Ivanna_Tang_3B
Tue Oct 11, 2016 7:52 pm
Forum: Balancing Chemical Reactions
Topic: quiz 1 prep #1: state of PCl3
Replies: 1
Views: 502

quiz 1 prep #1: state of PCl3

Hi, how can I tell what the state of the product will be? The problem reads : Solid phosphorus reacts with chlorine gas to produce phosphorus trichloride. I looked it up and the internet says that PCl3 at room temperature is a liquid, but I can't assume that for the reaction, right?
thank you!
by Ivanna_Tang_3B
Mon Oct 03, 2016 10:52 pm
Forum: Photoelectric Effect
Topic: photoelectric effect post assessment #17: work function
Replies: 2
Views: 383

photoelectric effect post assessment #17: work function

Hi, #17 on the photoelectric effect post assessment #17 is as follows: Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m*s^-1. The work function for sodium is 150.6 kJ*mol^-1. I was wondering what it meant by the work function and how to use the 150.6 kJ*mol^...
by Ivanna_Tang_3B
Mon Sep 26, 2016 9:51 pm
Forum: Student Social/Study Group
Topic: Chemistry Jokes
Replies: 31
Views: 4270

Re: Chemistry Jokes

What do you call a tooth in a glass of water?
A one molar solution

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