Qualification > Sciences
Chemistry doubt
acash09:
Hey friends, what happens when an impurity is present in a substance, does:
* boiling point change; increase or decrease
* melting point change; increase or decrease
& when does ph increase or decrease?
e.g adding more water does what, not by neutralization.
thanks, acash09
WARRIOR:
An impure subsance melts at a rangge BELOW THE MELTING POINT
boils at a range ABOVE THE BOILING POINT
ph gr8er 7 is alkaline .....ph less than 7 is acidic .
adding more water just makes somethin more DILUTE ..means less acidic/or alkaline
J.Darren:
--- Quote from: Kimo Jesus on May 22, 2010, 05:55:15 pm ---An impure subsance melts at a rangge BELOW THE MELTING POINT
boils at a range ABOVE THE BOILING POINT
ph gr8er 7 is alkaline .....ph less than 7 is acidic .
adding more water just makes somethin more DILUTE ..means less acidic/or alkaline
--- End quote ---
Wait, I recall that back in 03 / 04 there is a reaction that involves Mg ribbon and acid, if you increase the volume of acid, the change in temp would decrease, same theory holds true for water, if it is a metal + water reaction, as we all know, salt and hydrogen is produced, yet the change in temperature would be smaller if greater volume of water is used. This is also a common question that appeared in Paper 6.
Kimo : Are you intended to compose a revision notes thingie for Physics P3 ?
WARRIOR:
--- Quote from: J.Darren on May 22, 2010, 07:11:29 pm ---Wait, I recall that back in 03 / 04 there is a reaction that involves Mg ribbon and acid, if you increase the volume of acid, the change in temp would decrease, same theory holds true for water, if it is a metal + water reaction, as we all know, salt and hydrogen is produced, yet the change in temperature would be smaller if greater volume of water is used. This is also a common question that appeared in Paper 6.
Kimo : Are you intended to compose a revision notes thingie for Physics P3 ?
--- End quote ---
if u mean chemistry paper 3 ..yep!
J.Darren:
--- Quote from: Kimo Jesus on May 23, 2010, 10:54:27 am ---if u mean chemistry paper 3 ..yep!
--- End quote ---
LOL my bad :D
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