Es why the rusting of an iron nail in the presence of water and oxygen is an oxidation-reduction reaction? water is a reactant electrons are transferred. nonmetals and a metal are invo 0 energy is released.

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.)

Apush or pull that moves or changes and object when to objects touch

Which of these features are formed when hot groundwater is forced out through cracks in the earth's surface?