Answers: 3
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 15:30, sanchez7489
Draw the lewis dot structure for each of the following polyatomic ions
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Chemistry, 22.06.2019 16:00, anferneebcoleman
How many moles of oxygen react with 12 moles of aluminum
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Chemistry, 22.06.2019 18:40, johnnysteeler9934
What is one real world example of a colligative property?
Answers: 2
Answer in the correct significant figures: 31.2 x 4.13*...
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