Recent content by jeannagui

you don't need a moving train to see if a ball moves with wind! Actualy the question would be why didn the ball remain in its place in space when you threw it in the air and didn go bakward? in fact, you re stick to the train but it's not? why didn it loose the train speed when not being...

well, that in case they ARE in the same reaction medium but it's still right because any atom wants to get the electronic confugaration of the nearest noble gas so for Na it's Na+ Ne and for Cl its Cl- Ar

yea,well , right but it's asking the number of double bonds so pobably that's what he meant!

man WOW! it's much simpler electron affinity is inversly propertianal to atomic radius RIght? why? and atomic radius is directly proportianal to number of positive charges right? why?

no it can't happen electonegativity must be different for element to another because the number of protons,electrons,atomic radius and number of energie lvls are different between elemnts. the problem is that some numbers are very close like (2.489347458 and 2.497483834) well, those long...

Ygggdrasil the question state it's an organic acide ->only one structural formula it's simple -> always back to the alkanes formula Cn H2n+2 since the COOH group origanly replace a H atom of an anlkan so the molecular formula would be C11H20 well, in a normal alkane 20 atoms of H are not...

well u is the emf of the source right ? but what is this ---------u1 ? wat's U1

well it's not clear for me but i'll try to help: the one u’ve found(immersed weight=weight-weight of displaced fluid) is used in case the body is not floating totally immersed well it’s not the case because density of the body(continental crust: 2800 kg/m3) less than that of the...

-1- no force: |------|......|---------| A1-> area of small piston |_A1__|......|___A2 __| A2-> area of large piston |_____|......|________| no force applied |------|......|---------| |------|......|---------| |------|____________|---------|...

it's pretty clear 1-0.8=0.2N