Chemistry, 27.04.2021 18:50 tylerkitchen44
You are about to watch a video about a scientist who studies jellies like the one shown in this image. One thing she investigates is changes to the number of jellies living in an area. What ideas do you have about why the number of organisms in an area might increase?
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Chemistry, 21.06.2019 22:20, aidengalvin20
One or more substances changing into one or more substances is an example of a
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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
You are about to watch a video about a scientist who studies jellies like the one shown in this imag...
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