Chemistry, 22.01.2021 08:10 ceceshelby51631
I really need help :( How can you differentiate or measure the strengths of acids and bases qualitatively and quantitatively?
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Chemistry, 22.06.2019 11:30, samantha9430
Determine the reaction and balance the following equations urgent due in the morning
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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.)
Answers: 1
I really need help :(
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