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cestrela7 [59]
4 years ago
9

Which equation shows a conservation of mass?

Chemistry
1 answer:
pychu [463]4 years ago
8 0
(4) PCl5--> PCl3+ Cl2 is the correct answer because we both have 1 P atom and 5 Cl atoms on both sides, and thus the masses of the elements don't change.
Hope this would help~
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Na is positive because
as we know it's atomic number is 11 that means it has 11 protons and 11 electrons
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and something same happens in clorine and because it gains one electron and the number of electrons increase in it by 1 whise charge is -ve so, the atom becomes negatively charged ion or anion which has a -1 charge.
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