A solution containing a mixture of metal cations was treated as outlined. Dilute HCl was added and a precipitate formed. The precipitate was filtered off.
H2S was bubbled through the acidic solution. No precipitate formed.
The pH was raised to about 9 and H2S was again bubbled through the solution. A precipitate formed and was filtered off.
Finally, sodium carbonate was added to the filtered solution. A precipitate formed and was filtered off.
What can be said about the presence of each of these groups of cations in the original solution?
Options: None of these ions were present
At least one of these ions was present
All of these ions were present
Unknown

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"

so she was walking and she stepped on warm jeffy , uh uh uhh dadye i just pooped my pants

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.