Which statement about enzymes is true?

a)they are large molecules that decrease the rate of reactions in the body.
b)they are large molecules that increase the rate of biologically important reactions.
c)they slow the rate of chemical reactions.
d)they are permanently changed in the course of a reaction.

Why is the vapor pressure of a warm lake higher than the vapor pressure of a cold lake? o a. warm water has a greater heat of vaporization. ob. warm water evaporates more quickly. cool water evaporates more quickly. od. cool water has a greater heat of vaporization.

Which of the following compounds would be expected to have the strongest ionic bonds? a)the compound that has b)the largest ions with the greatest charge c)the compound that has d)the largest ions with the least charge the compound that has the smallest ions with the greatest charge the compound that has the smallest ions with the least charge

Stoichiometry- i need with 14 and 15! an explanation would be appreciated!