Answers: 1
Chemistry, 22.06.2019 11:40, Wemaybewrong
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.)
Answers: 1
Chemistry, 22.06.2019 16:00, annsmith66
What statement goes against the kinetic theory of gases
Answers: 1
Chemistry, 22.06.2019 19:00, cindyroxana229
Nan element’s square on the periodic table, the number with the greatest numerical value represents the
Answers: 3
The number of bonds an atom of an element can form is the same as the number of...
Mathematics, 26.04.2021 15:30
Advanced Placement (AP), 26.04.2021 15:30
Mathematics, 26.04.2021 15:30
Mathematics, 26.04.2021 15:30