Chemistry, 20.01.2020 06:31 foreverrocky12p2asun
Why are hypothesis valuable even if it's not supported by data
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Write a paragraph at least 10 sentences explaining how rocks are used today in society
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In a reaction (at equilibrium) that makes more moles of gas than it consumes, what is the effect of increasing the pressure?
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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.)
Answers: 1
Why are hypothesis valuable even if it's not supported by data...
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