Astudent wants to compare the amount of co2 given off by yeast provided with different amounts of sugar. the student places a balloon over each container to catch the released co2 which observation is a qualitative observation the student can make

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.