For a new chemical reaction involving several reactants

For a new chemical reaction involving several reactants, the order of reaction with respect to each reactant
    
 a.
is easily determined from reactions similar to the one in question.
 b.
may be determined from the coefficient for the respective reactant in the balanced chemical equation.
 c.
must be determined from the rate constant at time = 0.
 d.
must be determined from the overall order of the reaction.
 e.
must be determined experimentally using one or more methods.


    
In order to calculate the molality of a solution from its molarity, what other information would be needed?

 a.
molar mass of solute and molar mass of solvent
 b.
molar mass of solute and density of solvent
 c.
molar mass of solute and density of solution
 d.
molar mass of solvent and density of solution
 e.
molar mass of solvent and density of solute


Sand is insoluble in both polar and nonpolar solvents because
   
 a.
the interactions between the particles of sand are much stronger than the interactions between nonpolar molecules.
 b.
grains of sand have hydrophobic interiors and hydrophilic exteriors.
 c.
grains of sand have hydrophobic exteriors and hydrophilic interiors.
 d.
its atoms are held together by strong dipole-dipole forces.
 e.
its atoms are held together by a three-dimensional network of strong covalent bonds.