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Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife
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How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer
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Which of the following best supports the concept that genetic information is passed on to offspring from both of their parents, not just one?
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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) → 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
Can gravity be considered a force?...
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