Answers: 1
Chemistry, 22.06.2019 05:50, zaleemawhite
Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.
Answers: 2
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
Chemistry, 22.06.2019 12:30, murtaghliam1
Word equation for k(s) +h2o(l) yield koh (aq) + h2
Answers: 3
Chemistry, 23.06.2019 01:10, minasotpen1253
Volume is a measurement of how fast particles of a substance are moving
Answers: 3
Explain why boiling is a reversible change...
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