Answer:
what is that i connot understand your question
Explanation:
im sorry i connot answer your question
One thing that does not change is the chemical composition of water, which is still H2O. And maybe mass, if all of the particles remain inside the beaker, which was never mentioned in the question so I am not sure.
Waves travel through matter, so I am 99.9% sure that is the answer.
Id look through your lesson to be sure!
17) 8.4 / 20 x 100
18) 20 . 0.5150
19) 6,50% because (as you said) the law of definite proportions states that regardless of the amount, a compound is always composed of the same elements in the same proportion by mass
