Chemistry, 26.10.2021 23:10 ashiteru123
How many half-lives have passed if a rock contains 25% parent isotopes and 75% daughter isotopes?
Answers: 2
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) â 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 13:00
What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?
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Chemistry, 22.06.2019 15:00
âwhich reaction would most likely require the use of an inert electrode?
Answers: 1
Chemistry, 22.06.2019 19:00
What information does a complete ionic equation give that the balanced equation doesnât show?
Answers: 1
How many half-lives have passed if a rock contains 25% parent isotopes and 75% daughter isotopes?...
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