How are the number of protons represented in the periodic table?

a. atomic mass

b. mass number

c. atomic number

d. isotope

List four observations that indicate that a chemical reaction may be taking place

What overall charge must all compounds have

The equation below shows the reaction of zinc with hydrochloric acid (hcl). zn (s) + 2 hcl (aq) —> zncl2 (aq) + h2 (g) what will happen if the concentration of hcl is decreased? a. more zncl2 will be produced. b. the reaction rate will slow down. c. the hydrochloric acid will become more acidic. d. the reaction will produce water instead of hydrogen gas.