Which contributes to the dissolution of sugar in water?

a. a strong pull of water molecules on a polar covalent compound
b. the dissociation of an ionic compound in water
c. a strong pull of water molecules on an ionic compound
d. the dissociation of a polar covalent compound in water

and it's not a or d according to my test. please help

Which is true of chemicals? a. things containing chemicals always cost a lot of money. b. chemicals are never dangerous. c. chemicals are in many substances in a home. d. chemicals are rarely found on earth.

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.