I don't know the answers to the last two, but I think I know the answer to the first one.
Answer:
1. B
Explanation:
1. I believe that the answer is B - hypo means without, so the one that started low and built concentration of the solute was initially (at the beginning) without/had less solute - therefore, it's hypotonic.
Answer:
The solvent
Explanation:
After the solid is recoverd by decanting the liquid, some solvent particles may still adhere to the solid.
In order to remove the solvent that may have adhered to the solid completely , the solid is washed before it is now dried.
Because those can leak and cause cancer
i’m pretty sure 5 valence electrons