2. What will happen to the solute
in a jar of a sugar-water solution if
you leave it in a dark place for
several days without disturbing it?

The sugar crystals recrystallises, and settles at the bottom of the container especially if the temperature of the mixture cools down gradually with time when left undisturbed.

Explanation:

Solubility is the ability of some solids (solute) to dissolve in a liquid (solute) forming a solution. It depends on temperature, amount of solute to solvent etc.

In some cases, leaving the product undisturbed over time can revert the process, forcing the solid to recrystallise out of the solvent.

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.