If a neutral atom of oxygen has 8 protons, 8 electrons, and 7 neutrons, what number is the mass number of this atom?
a. 8
b. 15
c. 16
d. 23

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.

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

What effect does a decrease in temperature have on the overall rate of a chemical reaction? a decrease in temperature decreases . the reaction rate will