concepts for ochem/gchem

[Jo07]

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Here the rules/what to look for regarding the following:

Boiling point- cis alkene has greatest, internal>terminal
molecule with no branching has highest boiling pt.
OH have highest BP.

Melting point: trans alkene has higher.
branched, symmetrical molecule has highest.

Can someone add some concepts here???

most soluble: Hydrogen bonding to F, O, or N.
cmpds with Group 1A metals, and NH4
insol- Ag, Hg,Pb,BaSO4, CaCO3

Freezing point- compd with most particles -What is an easy way to figure this out?

Hydogen bonding increases BP, MP, viscosity, Surface tension, solubility.

If increasing temp. increases vapor pressure then how come the a high boiling point has a low vapor pressure???

Gas is most sol at low temps and high pressure (think 2L coke), and solids are more sol at high temps.

Ethers are most non-polar, only soluble if 4 C or less.

Can anyone add to these basic concepts or correct me if I'm wrong? I'm not trying to answer my own questions...just seeing if these are correct 🙂

 

[sacjumpman]

Everything looks good.

For your solubility rules, make sure you know the rest of them as well:

Soluble:
NH4+
Group IA
CO3- (carbonates)
NO3- (nitrates)
ClO3- (chlorates)

Cl-, Br-, I- except with Ag, Pb, Hg

SO43- (sulfates) except Ag, Pb, Hg and Group IIA

Insoluble
Phosphates except with NH4+ and Group IA
CO3- (carbonates) except with NH4+ and Group IA
O2- (oxides) except with NH4+ and Group IA

OH- except with NH4+, Group IA, and Group IIA from Ca down

S2- except with NH4+, Group IA, Group IIA

Not that you didn't know these, but just a reminder.

 

[lilietta2000]

👍