Chemistry, 17.03.2020 04:38, andrewmena05
Modern pennies are composed of zinc coated with copper. A student determines the mass of a penny to be 2.483 g and then makes several scratches in the copper coating (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)+2HCl(aq)→H2(g)+ZnCl2(aq) The student collects the hydrogen produced over water at 25 ∘C. The collected gas occupies a volume of 0.894 L at a total pressure of 794 mmHg . Part A Calculate the percent zinc in the penny. (Assume that all the Zn in the penny dissolves.)
Answers: 1
Other questions on the subject: Chemistry
Chemistry, 22.06.2019 17:20, banna01man
Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.
Answers: 2
Chemistry, 22.06.2019 18:00, kamjay2006
The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.
Answers: 1
Do you know the correct answer?
Modern pennies are composed of zinc coated with copper. A student determines the mass of a penny to...
Questions in other subjects:
Mathematics, 12.08.2020 04:01
