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Chemistry, 21.06.2019 22:00, creepycrepes
Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.
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Chemistry, 22.06.2019 05:00, YoEsMyles3115
0.2348 grams of pbcl2 used to form 44.0 ml of solution.
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Chemistry, 22.06.2019 10:00, ellaemtagedeane
Nonpoint source pollution is difficult to control because it
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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
Mathematics, 22.12.2019 01:31
Biology, 22.12.2019 01:31
Mathematics, 22.12.2019 01:31
Mathematics, 22.12.2019 01:31
Mathematics, 22.12.2019 01:31