Home work
1 aluminium reacts with sulphuric
i below -
o 2 al 13 h₂o - alo (souls
a
2 y 20 og of aluminium are put in the
ning 1157 of sulphuncatid
a which reagent is limiting
b) how many moles of hydrogen gas will
c how many moles and grams of the
excess will remain after the reaction

pie chart because it is in percents ( % )

1 is the answer to this problem

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.