[_ Old Earth _] basic chemistry

[jasoncran]

can anyone refresh me on the basics of chemistry here. i know the boer atomic model and recall the quantum theory and the valence shells and remember some of the periodic table.

jason

 

[VenomFangX]

The chemistry models which you were most likely taught at school is merely that, a model to help understanding to a limited degree and do not reflect the reality, nor the complexity of what is really there. Quantum theory is not really chemistry though the Heisenberg uncertainty principle is still taught which explains why you cannot find the momentum or location of an electron at the same time.
Stoichiometry still stacks up however, and is neat to understanding quantities of reactants to make the products taking into account factors of equilibrium. It gets really exciting when you delve into biochemistry and understand the intricate processes of living things. Not sure where you are at, but any High School Text book on chemistry is good to brush up lost skills. My favourite is making crystals. I love crystals,

 

[jasoncran]

The chemistry models which you were most likely taught at school is merely that, a model to help understanding to a limited degree and do not reflect the reality, nor the complexity of what is really there. Quantum theory is not really chemistry though the Heisenberg uncertainty principle is still taught which explains why you cannot find the momentum or location of an electron at the same time.
Stoichiometry still stacks up however, and is neat to understanding quantities of reactants to make the products taking into account factors of equilibrium. It gets really exciting when you delve into biochemistry and understand the intricate processes of living things. Not sure where you are at, but any High School Text book on chemistry is good to brush up lost skills. My favourite is making crystals. I love crystals,

i havent been to high school since 91, ere you were born. stoichiometric is a term used in the auto repair field. it means the ideal ratio is the 14.7/1 air/fuel ratio.

 

[Barbarian]

i havent been to high school since 91, ere you were born. stoichiometric is a term used in the auto repair field. it means the ideal ratio is the 14.7/1 air/fuel ratio.

That would be a chemical issue. It means that just enough oxygen for complete combustion of the gasoline can be gotten in a volume of air 14.7 times that of the appropriate amount of gasoline.

If one molecule of oxygen were sufficient for combustion of one molecule of gasoline, it would mean one mole of oxygen is in a volume of air 14.7 times the volume of a mole of gasoline. If gasoline were 100% unbranched octane (8 carbons in the gasoline molecule, than it would take 25 moles of oxygen for one mole of gasoline)

2 C8H10 + 25 O2 => 16 CO2 + 18 H2O

 

[jasoncran]

i havent been to high school since 91, ere you were born. stoichiometric is a term used in the auto repair field. it means the ideal ratio is the 14.7/1 air/fuel ratio.

That would be a chemical issue. It means that just enough oxygen for complete combustion of the gasoline can be gotten in a volume of air 14.7 times that of the appropriate amount of gasoline.

If one molecule of oxygen were sufficient for combustion of one molecule of gasoline, it would mean one mole of oxygen is in a volume of air 14.7 times the volume of a mole of gasoline. If gasoline were 100% unbranched octane (8 carbons in the gasoline molecule, than it would take 25 moles of oxygen for one mole of gasoline)

2 C8H10 + 25 O2 => 16 CO2 + 18 H2O

here's the kicker most cars operate slightly above or below that ration above=rich below lean the more above ration part is where smog is reduced.

jason

 

[VenomFangX]

C8H10....?? Assuming the main part of petrol is Octane that is C8H18, In this particular molecule C8H10 that would indeed have a peculiar property and structure.

trimethylpentane (isooctane), widely used in gasoline, has a chemical formula of C8H18 and it reacts with oxygen exothermically
2C8H18 + 25O2= 16CO2 + 18H2O +10.86MJ

 

[jasoncran]

C8H10....?? Assuming the main part of petrol is Octane that is C8H18, In this particular molecule C8H10 that would indeed have a peculiar property and structure.

trimethylpentane (isooctane), widely used in gasoline, has a chemical formula of C8H18 and it reacts with oxygen exothermically
2C8H18 + 25O2= 16CO2 + 18H2O +10.86MJ

octane like that is coming from ethanol in states is that the formula for that one. We went from menthanol a couple years ago. shoot some old timer through in lead in the forumla and i want to see that one.

jason

 

[Barbarian]

Yeah, typo, which then got carried into the equation. The general formula for alkanes is CH2+2.

All alkanes oxidize exothermically, BTW.

 

[jasoncran]

Yeah, typo, which then got carried into the equation. The general formula for alkanes is CH2+2.

All alkanes oxidize exothermically, BTW.

throw in nitrogen as that is in the atmosophere and also the various no(x) will occur unless the combustion process is cooled slighty by water, or exhaust gas.

jason

 

[VenomFangX]

Indeed, that is why Los Angeles has its smog. The nitrogen oxides turn into nitrogen dioxide due to photochemical reaction. Combines with water in your lungs to turn into nitric acid. Very corrosive on everything including car tyres.

 

[jasoncran]

they live in a valley with no means naturally to remove that smog.My hometown gets smog but the ocean breeze removes it.

the three way catlylitc converter removes a lot of the no(x) molecules.

jason

 

[VenomFangX]

Might be best to get back to horse and cart: but then again they will tax you on horse emissions.
VFX

 

[jasoncran]

Might be best to get back to horse and cart: but then again they will tax you on horse emissions.
VFX

lol, aint that the thruth.

 

[GojuBrian]

Hey! His horse passes more gas than mine does!!! :mad :D

I think military service is a great thing. It gives people the discipline they desperately need, but may not want.

I'll never regret serving in the military.

I really can't stand anti-military types either. :naughty

 

[jasoncran]

Hey! His horse passes more gas than mine does!!! :mad :D

I think military service is a great thing. It gives people the discipline they desperately need, but may not want.

I'll never regret serving in the military.

I really can't stand anti-military types either. :naughty

how's the last three lines relate to this op