the thickness of the water's container
the answer is orange juice
Ionic salts, for example nitrates.
decreasing the temperature of the water
Rubbing alcohol evaporates faster than Pepsi.
Crushing the sugar cube allows more surface area with the water that hydrates (dissolves) the sugar molecules. Therefore, it will dissolve faster. Stirring helps.
highest possible temperature for the water, without boiling
Good aerodynamics and as much power as possible (emissions and reliability, being the deciding factors).
advil
the answer is orange juice
vinegar
Starbucks VIA
hot water
Calcium Carbonate minerals such as gypsum, selenite and barite
coke
i think advil dissolve the fastest
i don't know, doing science fair project on this; which soda can dissolve steak fastest... COKE, DR PEPPER, or SPRITE
a marshmallow is made up of corn syrup which increases its ability to dissolve and soda pop is caffeine which can dissolve it fastest