Chemistry, 02.09.2019 03:10 Loggtech24
Agraduated cylinder contains multiple different
liquid layers. very small samples are taken from
the liquids at various heights and tested for
density, viscosity, and boiling point.
the data are listed in the table:
how many different liquids are present in the
graduated cylinder?
a) 1 b) 3 (6)7 d) 10
Answers: 1
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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.)
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Agraduated cylinder contains multiple different
liquid layers. very small samples are taken fr...
liquid layers. very small samples are taken fr...
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