Help me im in middle school btw
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Chemistry, 22.06.2019 11:40
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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Chemistry, 22.06.2019 13:30
Some animals that try to adapt to climate changes eventually die due to starvation, as climate change alters the web.
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Chemistry, 23.06.2019 02:00
Why does ammonia, nh3, behave as a base when it reacts with an acid? z
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History, 13.04.2020 22:19
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Mathematics, 13.04.2020 22:20
Mathematics, 13.04.2020 22:20