Which of these changes produces the greatest
increase in entropy?
(1) caco3(s) --> cao(s) + co2(g)
(2) 2 mg(s) + o2(g) --> 2 mgo(s)
(3) h2o(g) --> h2o(l)
(4) co2(g) --> co2(s)

Explain how the integumentary system plays a crucial role in the ability to maintain homeoestasis

Consider this equilibrium: n29) + o2(g) + 2no(c).nitrogen gas and oxygen gas react when placed in a closed container. as the reaction proceeds towards equilibrium, what happens to the rate of thereverse reaction?

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)