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how does a low density hydrogen cloud in space becomes a star?
please dont repeat the words of marking scheme..i need some detail
please dont repeat the words of marking scheme..i need some detail
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how does a low density hydrogen cloud in space becomes a star?
please dont repeat the words of marking scheme..i need some detail
in a.c motor carbon brushs r not used...split ring commutator is used....in DC motor carbon brush is used to chnge diretion of current every half turn so tht coil rotates is same direction..!!!
oohhh yeah...... i mixed em up....carbon brushes are used both in AC generator and DC motor to keep contact with circuit without restricting movement!
in AC generator, SLIP rings are used
in DC motor, SPLIT ring commutator is used
is the split-ring commutator function as reverse the current, not the carbon brush?in a.c motor carbon brushs r not used...split ring commutator is used....in DC motor carbon brush is used to chnge diretion of current every half turn so tht coil rotates is same direction..!!!
The answer would be d.can anyone explain this
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_s11_qp_42.pdf
why is Q6 answer not a?
because in P, the concentration is high, but surface area is low(zinc pieces)
an in Q, the concentration is low, and surface area is high(zinc powder)
wouldnt this account for same speed of reaction??
that i know, but why P is faster when surface area of zinc is less?The answer would be d.
observe the molarity of both of the acid.
this has been cleared man:is the split-ring commutator function as reverse the current, not the carbon brush?
But the amout of acid is low and the concentration is high. Second one is rather dilute one. So reaction would be fast at Pthat i know, but why P is faster when surface area of zinc is less?
answer is C?can anyone explain this
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_s11_qp_42.pdf
why is Q6 answer not a?
because in P, the concentration is high, but surface area is low(zinc pieces)
an in Q, the concentration is low, and surface area is high(zinc powder)
wouldnt this account for same speed of reaction??
can anyone explain this
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Chemistry (5070)/5070_s11_qp_42.pdf
why is Q6 answer not a?
because in P, the concentration is high, but surface area is low(zinc pieces)
an in Q, the concentration is low, and surface area is high(zinc powder)
wouldnt this account for same speed of reaction??
yes it is (c)answer is C?
ohk yes it IS (d)Answer is D -_____-
Answer is D -_____-
It's D.yes it is (c)
ohk dude i AGREE itz (d)..... -.-It's D.
Production depends upon the moles. And the rate of reaction on the conc. of acid!!
but yar wouldnt particle size also effect rate of reaction???But the amout of acid is low and the concentration is high. Second one is rather dilute one. So reaction would be fast at P
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