What is the net force on the book in the following figure?
f2= 18n
f1= 20 n
a.2 n to the left
b.4 n to the left
c.2 n to the right
d.4 n to the right

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.