Match the factors which affect the rate of dissolving/dissociation/diffusion. 1. increased surface area
2. like dissolves like
3. temperature
4. stirring spreads

rate proportional to kinetic energy
matching polarity
finely divided solute
solute throughout solution

Increased surface area - finely divided solute

like dissolves like - matching polarity

temperature - rate proportional to kinetic energy

stirring spreads - solute throughout solution

c is the answer because when something is left after something evaporates that shows the chemical change.

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg