Chemistry, 19.07.2019 10:30 nolanreano
Will mark as brainliest. what model is the basis for chemistry? a) virchow's model b) bohr's atomic model c) schwann's cell theory d) exponential growth and decay model
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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) โ h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 ยฐc. 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 21:00
Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon
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Chemistry, 23.06.2019 03:30
Calculate the ph of a .10m nh4cl solution. the kb value for nh3 is 1.8ร10^-5
Answers: 1
Will mark as brainliest. what model is the basis for chemistry? a) virchow's model b) bohr's atomic...
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