An atom with 4 protons, 5 neutrons, and 4 electrons has an atomic mass of amu.
(place a whole...
Chemistry, 27.06.2019 01:10 joshsd8479
An atom with 4 protons, 5 neutrons, and 4 electrons has an atomic mass of amu.
(place a whole number)
Answers: 1
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
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Is 9 correct? and can someone me with 10? it’s due tomorrow, you
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Chemistry, 22.06.2019 14:30
What state of matter is ice a. liquid b. element c. solid d. gas
Answers: 1
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