Chemistry, 26.07.2019 22:50 louiecampos
What are two solid structures that expand and contract
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Chemistry, 22.06.2019 02:40
The difference between the atomic number of an element and the element’s atomic mass is the number of ions.
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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
Chemistry, 22.06.2019 23:00
What is the oxidation state of an individual bromine atom in nabro3?
Answers: 2
What are two solid structures that expand and contract...
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