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There are 9.23 x 1023 molecules of water in a beaker, how many moles are there?...
Chemistry, 18.05.2021 22:40 mayachojnicki
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There are 9.23 x 1023 molecules of water in a beaker, how many moles are there?
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Which substances have the lowest melting points: ionic covalent, or metallic
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In which phase(s) do the molecules take the shape of the container?
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Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5
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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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