The mass of a piece of iron is 39 g and its volume is 5 cm. What is its density?
A. 6.7 g/cm3
B. 9.2 g/cm
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C. 34 g/cm3
D. 7.8 g/cm3
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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.