If a hot tub gave you - 3,000 J of heat energy, how much heat did you absorb, assuming none was lost

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

In a water molecule, hydrogen and oxygen are held together by a(an) bond. a) double covalent b) ionic c) nonpolar covalent d) hydrogen e) polar covalent

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures