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Biology; Chemistry; Physics: Post your doubts here!

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i
(i) is correct
(ii) is inversely proportional
(iii) is correct, though i dont know about directly proportional. T increases as I increases!
if T increases as I increases and T increases as R increases so the current and resistance should b directly proportional no??..:sleep:
 

asd

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less hydrogen atoms would mean that less amount of hydrogen gas will be produced, it doesnt affect the rate of reaction!
only factors affecting rate are:
temp
concentration
surface area

the volume, mass or amount of reactants dont affect rate of reaction
dude, see this : 5/1000 * 0.2 = 0.001 moles in P
20/1000 * 0.1= 0.05 moles in Q

This DOES mean that more hydrogen will be produced in Q, but note the no. of moles in the given concentration.
But, volume dilutes the acid. And more moles of H in a diluted acid will take MORE time.

If you take one acid of 0.2 mol/dm3 and other of the same concentration. If the first one has more moles, which will take more time? :)
 

asd

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i
if T increases as I increases and T increases as R increases so the current and resistance should b directly proportional no??..:sleep:
No.
In V=IR, for the same voltage, I will decrease if you increase R, and vice versa,
And it would be 'R increases as T increases'
 

asd

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K ash, you're right then, but tell me will they cut my marks for magnification ?
 
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asd

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isn't that the same thing i said??
No not the same thing, my thing suggests that I is independent, and T is dependent. T increases if I increases. So temperature increase will cause resistance to increase, and consequently, I will decrease. So it's wrong to say I increases with T, It would actually decrease with T.
However, it's appropriate to say that T increases with I.
 
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K ash, you're right then, but tell me will they cut my marks for magnification ?
yar , it was for only two marks, so one mark would have been for large realistic drawing, etc. the other would have been for the accurate inside placing, as far as i think.
but for magnification, i dont think they will cut your mark if u have shown both on your drawing and on the figure which measurement you have taken, and completed your answer according to correct formula. U wud easily be awarded the e.c.f. mark for the actual magnification value eg 1000x, 900x, etc. becoz lately they dont actually give actual magnification value in marking scheme.
 
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sorry! i meant to say that I decreases as T increases.
see the first link for exact answers, and other for detailed reading:
http://answers.yahoo.com/question/index?qid=20080306001612AAHhpM2

http://wiki.answers.com/Q/Investiga...rough_a_length_of_wire_and_its_heating_effect
a) Current decreases as temperature increases due to the atoms in the material getting more energetic hindering the flow of electrons. this is written there ...:/ v just agreed that T increases as I increases..
 

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a) Current decreases as temperature increases due to the atoms in the material getting more energetic hindering the flow of electrons. this is written there ...:/ v just agreed that T increases as I increases..
talking to me?
 
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No not the same thing, my thing suggests that I is independent, and T is dependent. T increases if I increases. So temperature increase will cause resistance to increase, and consequently, I will decrease. So it's wrong to say I increases with T, It would actually decrease with T.
However, it's appropriate to say that T increases with I.
thanx!!!!!!!!!!!!!...=D
 
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