Search found 9 matches

by Crystal Ma
Fri Mar 11, 2016 5:19 pm
Forum: *Cyclopropanes and Cyclobutanes
Topic: Eclipse
Replies: 1
Views: 543

Eclipse

When we say that a cyclohexane is eclipsed, should we say all the carbon-carbon bonds are eclipsed, or Carbon-hydrogen bonds are eclipsed?
by Crystal Ma
Tue Feb 09, 2016 11:02 am
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Perfect Crystal
Replies: 1
Views: 1544

Perfect Crystal

What is the definition for perfect crystal? and what does professor mean by that there is no impurity and defect?

Also, According to the formula, , should the entropy be 0 if W=1, even when the temperature is not 0 degree?
by Crystal Ma
Sun Feb 07, 2016 11:49 pm
Forum: Balancing Redox Reactions
Topic: Anode and Cathode
Replies: 3
Views: 430

Re: Anode and Cathode

The reactant in the reaction that has the lower cell potential will give out electron in the whole electrochemical reaction (aka being oxidized), and become the anode.
by Crystal Ma
Sun Jan 17, 2016 11:24 am
Forum: Phase Changes & Related Calculations
Topic: Steam Burns vs. Water Burns
Replies: 6
Views: 2634

Re: Steam Burns vs. Water Burns

It requires energy to turn water from a room temperature to 100 degrees (the boiling point), and it also requires energy to turn boiling water to steam. To convert one gram of water to steam requires 540 calories. Thus steam stores more energy than water, thus causes more damage.
by Crystal Ma
Fri Dec 04, 2015 7:22 pm
Forum: Calculating the pH of Salt Solutions
Topic: Why is H-H Equation an approximation
Replies: 2
Views: 571

Why is H-H Equation an approximation

I think I heard prof say Henderson-Hasselbalch Equation is a way to get the approximate pH. I didn't get why. Would anybody explain?

Also why the beginning of the pH curve of a strong acid-strong base titration flatter than a strong acid-weak base titration?

Thank you.
by Crystal Ma
Fri Nov 20, 2015 11:49 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Methane classification
Replies: 3
Views: 502

Re: Methane classification

I'd say methane is a very weak acid because it is a proton donor but can be ionized at a low level.
by Crystal Ma
Sun Oct 25, 2015 5:58 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Energy Change When Losing a Electron
Replies: 2
Views: 373

Energy Change When Losing a Electron

From the book we know that removing a e- requires energy, so does it mean after the e- is moved, the energy of the atom(ion) will increase?

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