Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
Vin:
--- Quote from: ahmediiii on June 05, 2010, 02:04:54 pm ---Umm...could someone tell me WHY increasing pressure favors the RHS of equation in gases... why it moves equilibrium to right
--- End quote ---
okay, image the pivot and scale as in physics.. reaction of N2 + H2 as an example..
____ _____
| N2| | |
|H2 | |NH3|
------ | |
-------------------------------
|
Always when a reversible reaction is in equilibrium and you make a change(inc/dec. pressure/temp), it will do what it can to oppose the change.
Temp::Increase the temp. the heat will be used to both for forward as well as the backward reaction. Forward: N2 and H2 combine, backward:heat used to break NH3 to form. This is a state of dynamic equilibrium.
Pressure::Increase the pressure(by adding more N2 and H2), the mixture will act to oppose the change and eliminates these molecules by combining them to form NH3 so the equi. shifts to the right..
MasterMath:
--- Quote from: JD46 on June 05, 2010, 02:24:44 pm --- u answered you own question!!
due to its property to noe dissolve in excess watering,rain, caco3 will not make the soil alkaline,on the other hand Cao is soluble to some extent and willl make the soil alkaline in PH
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but hmm... How does it neutralize the acidity of the soil without increasing its Ph >_< ?
I got what you mean but im a bit confused
MasterMath:
--- Quote from: MasterMath on June 05, 2010, 02:26:34 pm ---but hmm... How does it neutralize the acidity of the soil without increasing its Ph >_< ?
I got what you mean but im a bit confused
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You mean when you add either of them .. they react with the acidic parts or w.e and then just stop reacting unless they disolve ..? and when they disolve they would obviously make it Ph>7 ?
nid404:
--- Quote from: MasterMath on June 05, 2010, 02:22:49 pm ---I haveee justtt one question :D..there is this question about using Calcium carbonate instead of calcium oxide .. I know that calcium carbonate is not soluble so it remains longer in soil.. but they say in MS .. that calcium carbonate the Ph cant go above 7 , but with calcium oxide it can go.. i dont get that part.. thanks in advance!
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Carbonate is a salt...so it's pH is neutral
whereas oxide of group 2 metals are alkaline.
JD46:
Could someone scan their guide,or click a pic or anything,but post it up here,this is about chemistry excess reagents, could you scan the part in bob berry's guides and put it up here Pg 33 -34 i thnk as you can see many people are having doubts bout the reagent stuff!! so this time around someone DO STH!! the last i got NO RESPONSE!,it will benefit lots of people
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