gen. Chem theory

[kING701]

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It seems as though people are stressing that general Chemistry theory is where people lose their marks on the actual DAT.

I will list all of the theory I know here (just briefly).
Feel free to add anything I miss. The more people that add to this tread, the less chance of us not knowing a concept!

• 1st law of thermodynamics - energy is conserved
• 2nd law of thermodynamics - spontaneous rxns increase entropy of universe
• 3rd law of thermo. - entropy of pure crystal at absolute (-273 deg cel)
• Periodic table trends (affinity, ionization, electroneg, melting point, boiling point)
• Geometry of molecules
• Types of bonds (ionic, metallic, covalent, molecular)
• Quantum numbers (n, l, ml, ms)
• Definitions of acids/bases (lewis, bronstead, arren)
• All the gas laws (graham, dalton, boyle, ideal, charles)
• kinetic theory of gases
• Heat curves (understand/know how to read them)
• phase diagrams (understand/know how to read)
• Colligative properties
• Ksp/ion products and other K terms
• Redox rxns/oxidizing agent/reducing agent
• Galvanic/electrolytic cells
• Hess's law
• Gibbs free energy
• Rates of rxn
• enzymes (role in reaction and how they are affected)
• Nuclear decay partles (alpha, beta, gamma)

Okay so this is what I know, if I'm missing stuff ADD to the thread so we can totally own the gen. chem section.

 

[Nate G]

That looks like a good list. Can any of you that have taken it verify if those are the types of questions that would be good to study?

 

[kING701]

damn! I was expecting more activity.😴

 

[TheWiredNerv]

Looks good so far.
- Light Spectra ( Radio to UV : longer to shortest)
- Kinetic Graphs for 0, 1st and second orders including half-life.
- Titrations of strong base to strong acid, wa + sb, sa + wb and their titration curves (including polyprotic acids,)
- Solubility trends.

All I can think of right now.

 

[TheWiredNerv]

Oppsies. Not light spectra. I meant radiation spectrum.

 

[Mstoothlady2012]

ROYGBIV (wavelength, freq & energy)
electromagnetic waves - CGXUVIMR ( freq, energy, wavelength
catalyst
buffer system

 

[Jo07]

my brain hurts. no more. when will it ever endddd??😱

Tomorrow I'll go over my gchem notes and add on.

 

[Jo07]

Mstoothlady:

Did you have any rate of rxn questions? Where you actually look at each concentration and compare A and B then do the rate thingy?


UGH

 

[Jo07]

Whem metal oxides (CaO, K2O) react with H20--> basic solutions and basic anhydrides.

Non-metal oxides (CO2, SO3) react with H20--> acid anhydrides.

 

[TheWiredNerv]

Balmer Series: Visible Light, Excited -> N = 2
Lyman Series: UV, Excited to N = 1
Paschen: IR " " to N = 3
Brackett: IT " " to N = 4

 

[beccaaron]

Balmer Series: Visible Light, Excited -> N = 2
Lyman Series: UV, Excited to N = 1
Paschen: IR " " to N = 3
Brackett: IT " " to N = 4

What is that?

 

[DkD]

Emission spectra. When an electron is excited (moves from a lower energy level to a higher level), energy is absorbed, and when it does just the opposite, the energy released can be of variable wavelengths. For e.g. In the Balmer series, it involes an electron moving from a higher energy state to n=2 level, releasing waves having wavelengths in the visible light spectrum 400-700nm.

 

[jigabodo]

Balmer Series: Visible Light, Excited -> N = 2
Lyman Series: UV, Excited to N = 1
Paschen: IR " " to N = 3
Brackett: IT " " to N = 4

I wish I remembered this when I was taking the DAT.

 

[shoombol tallah]

so does anyone know what a question would look like with those emmission spectra values? Not exact DAT questions but a general question...i've never seen that before.