Make up the formulas of the substances: zinc chloride, copper (I) oxide, calcium oxide, sulfur oxide (VI), nitric oxide (V).

| September 11, 2021 | education

Chemical formulas of substances are composed according to the valence of the atoms that make up the molecule. Find the total multiple of the valencies of the atoms, divide it by the valence of each atom, and the number of each type of atom (index) is obtained.

Zinc chloride. The total multiple of the valences of zinc (II) and chlorine (I) is two. Dividing the common multiple of 2 by the valence of zinc (II), we get one zinc atom. Dividing the same common multiple of 2 by the valence of the chlorine atom (I), we get two chlorine atoms. Answer: ZnCl2.

Copper (I) oxide. The total multiple of the valences of copper (I) and oxygen (II) is two. Dividing the common multiple of 2 by the valence of copper (I), we get two copper atoms. Dividing the same common multiple of 2 by the valence of the oxygen atom (II), we get one oxygen atom. Answer: Cu2O.

Calcium oxide. The total multiple of the valencies of calcium (II) and oxygen (II) is two. Dividing the common multiple of 2 by the valence of calcium (II) gives one calcium atom. Dividing the same common multiple of 2 by the valence of the oxygen atom (II), we get one oxygen atom. Answer: CaO.

Sulfur oxide (VI). The total multiple of the valencies of sulfur (VI) and oxygen (II) is 6. Dividing the total multiple of 6 by the valence of sulfur (VI) gives one sulfur atom. Dividing the same common multiple of 6 by the valence of the oxygen atom (II), we get three oxygen atoms. Answer: SO3.

Nitric oxide (V). The total multiple of the valencies of nitrogen (V) and oxygen (II) is 10. Dividing the total multiple of 10 by the valence of nitrogen (V) gives two nitrogen atoms. Dividing this same common multiple of 10 by the valence of the oxygen atom (II), we get five oxygen atoms. Answer: N2O5.



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