Qualification > Sciences
CHEMISTRY PAPER 1 HERE
GodOfWar:
aquous means dissolved in water or solution
molten means just melted, in pure liquid form
GodOfWar:
--- Quote from: sweetest angel on June 11, 2009, 09:30:54 pm ---
--- Quote from: cockyxrocker on June 11, 2009, 09:19:18 pm ---Nov 2008 questions 15,20,29
help!..
--- End quote ---
15) C...if it absorbs 10 from 1000cm^3 then it would absorb twice as much of heat from 500cm^3 since volume is halved!
20)HCL + BaNO3-->HNO3+BACL ....therefore the acidic nitric acid decrease the pH and since barium reacts with chlorine,therfore no precipitate
29)metals donot have 6 in their outa shell and always form ionic compounds thus B
--- End quote ---
for 15 the answer is A not C since the reaction is enothermic !
buh i still dont get it how will the solution absorb more heat if it has been halved ???. This is what i made out of it: since one of th rectants is being halved you wud need only half the energy .
....:
--- Quote from: GodOfWar on June 11, 2009, 09:51:01 pm ---
--- Quote from: sweetest angel on June 11, 2009, 09:30:54 pm ---
--- Quote from: cockyxrocker on June 11, 2009, 09:19:18 pm ---Nov 2008 questions 15,20,29
help!..
--- End quote ---
15) C...if it absorbs 10 from 1000cm^3 then it would absorb twice as much of heat from 500cm^3 since volume is halved!
20)HCL + BaNO3-->HNO3+BACL ....therefore the acidic nitric acid decrease the pH and since barium reacts with chlorine,therfore no precipitate
29)metals donot have 6 in their outa shell and always form ionic compounds thus B
--- End quote ---
for 15 the answer is A not C since the reaction is enothermic !
buh i still dont get it how will the solution absorb more heat if it has been halved ???. This is what i made out of it: since one of th rectants is being halved you wud need only half the energy .
--- End quote ---
It is just like physics. It takes double the amount of heat energy to increase the temperature of 1000 cm3 of water by 1 degree celsius, than to increase the temperature of 500, by 1 degree. Thus, if there is half the volume of water, and the same amount of heat, the temperature change will be double. Take an example of sharing money (assume, it is heat) between 10 children (assume its 1000 cm3 of water). If we half the number of children to 5 (volume decreased to 500), the amount of money each will get, will double (temperature increases). :)
Priceless:
wow i-insane....im soooo impressed...ur soooo smart.....n rely gud n effective eg.....
all da best 4 tom....Take care n cya :)
examfreak:
cud any1 plz xplain why is the answer for Q13 un nov. 2008 is B and not D?
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