Match the glacial feature with its description
The correct answer are
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Chemistry, 15.12.2020 08:00 SpeechlessZzz9920
Match the glacial feature with its description
The correct answer are
Answers: 3
Chemistry, 21.06.2019 19:00
Agood hypothesis includes which of the following? a: prediction b: data c: uncertainty d: conclusion
Answers: 1
Chemistry, 22.06.2019 00:10
Which of the following best describes the formation of plasma?
Answers: 1
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
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