Qualification > Sciences
Chemistry Help HERE ONLY !!
asus:
--- Quote from: godfather93 on May 24, 2009, 08:27:58 pm ---first of all the definitions of reductant and oxidant are
reductant - causes the other element to be reduced. when this happens the reductant is oxidised (loses electrons)
oxidant - cause the other element to be oxidised. when this happens the oxidant is reduced (gains electrons)
zinc is the reductant because it is being oxidised. the metal is being transformed into ions and electrons are given out (hence the zinc rod becomes thinner)
hydrogen is the oxidant because the hydrogen ions in the electrolyte is being changed into hydrogen gas(hydrogen is being reduced)
--- End quote ---
i think i got it...
million thanks to u.. :D
godfather93:
welcome all the way! :D
MaNa:
I need help in chemistry oct/nov 08 second varient paper
Q 7ai)
Roza:
--- Quote from: ManaH on May 25, 2009, 08:39:12 am ---I need help in chemistry oct/nov 08 second varient paper
Q 7ai)
--- End quote ---
i actually got this question for my mocks
here's the working
volume of oxygen left
according to question according to equation
1 mol 6.5 mol
if 20cm3 x??
so 20 x 6.5 = 130cm3
150-130 = 20cm3
so volume of oxygen left = 20cm3
volume of carbondioxide formed
1 4
20 x??
so 20 x 4 = 80
volume of carbondioxide formed = 80cm3
MaNa:
--- Quote from: Roza on May 25, 2009, 10:01:21 am ---
--- Quote from: ManaH on May 25, 2009, 08:39:12 am ---I need help in chemistry oct/nov 08 second varient paper
Q 7ai)
--- End quote ---
i actually got this question for my mocks
here's the working
volume of oxygen left
according to question according to equation
1 mol 6.5 mol
if 20cm3 x??
so 20 x 6.5 = 130cm3
150-130 = 20cm3
so volume of oxygen left = 20cm3
volume of carbondioxide formed
1 4
20 x??
so 20 x 4 = 80
volume of carbondioxide formed = 80cm3
--- End quote ---
Thankyou but wont we use the formulaa???
n umm why did u subtracted it form 150?
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