Advanced Placement (AP)
Advanced Placement (AP), 15.09.2019 01:10, evanmc627

The u. s. penny has a diameter of 1.905 cm. the densities of copper and zinc are
8.96 g/cm3 and 7.14 g/cm3, respectively.
a. between 1944 and 1982, the penny was made of a brass alloy that is 95% copper and 5% zinc by mass. if the mass of the penny was 3.09 g, find the volume (in cm3) and thickness (in cm) of the penny in mm. (assume the penny is a cylinder, v = πr^2h)

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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.)
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Physics, 14.07.2019 15:30, fefe57
Not too long ago houses were protected from excessive currents by fuses rather than circuit breakers. sometimes a fuse blew out and a replacement wasn't at hand. because a copper penny happens to have almost the same diameter as a fuse, some people replaced the fuse with a penny. unfortunately, a penny never blows out, no matter how large the current, and the use of pennies in fu se boxes caused many house fires. make the appropriate measurements on a penn y, then calcul ate the resistance between the two faces of a solid-copper penny. (modern pennies have the same dimensions, but are made of zinc with a copper coating.)
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Chemistry, 25.10.2019 04:43, allytrujillo20oy0dib
The zinc within a copper-plated penny will dissolve in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can get to the zinc). the reaction between the acid and the zinc is as follows: 2h+(aq)+zn(s)→h2(g)+zn2+(aq). when the zinc in a certain penny dissolves, the total volume of gas collected over water at 25 ∘c was 0.955 l at a total pressure of 742 mmhg .
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Chemistry, 05.11.2019 04:31, babyface1686
The zinc within a copper-plated penny will dissolve in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can get to the zinc). the reaction between the acid and the zinc is as follows: 2h+(aq)+zn(s)→h2(g)+zn2+(aq). when the zinc in a certain penny dissolves, the total volume of gas collected over water at 25 ∘c was 0.953 l at a total pressure of 752 mmhg .
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The u. s. penny has a diameter of 1.905 cm. the densities of copper and zinc are
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