find 25 chemicals formulae with criss cross method.
Answers
Answer:
as if 25 is so many here you go 5..,
A.Magnesium chloride
B.Calcium oxide
C.Copper nitrate
D.Aluminium chloride
E.Potassium nitrate
A.Magnesium chloride
We have to remember that the atomic number of Magnesium is 1212 and has a valency of 2. It means it has two electrons in the outermost shell for bonding. The atomic number of chlorine is 1717 and has 7 electrons in the outermost shell. It means it just needs one more atom for bonding. Hence, we will use atoms of chlorine to bond with one atom of magnesium.
We can apply the criss-cross method for this compound as,
(image 1)
Therefore, the chemical formula of magnesium chloride is MgCl2MgCl2.
B.Calcium oxide
We have to know that the atomic number of calcium 2020 and has a valency of 2, it means it has 2 two atoms in the outermost shell for bonding. The atomic number of Oxygen is 88 and has a valency of 2, it has 6 atoms in the outermost shell, it needs more 2 to complete the octet. Hence, we need one calcium atom to bond with one oxygen atom.
We can apply the criss-cross method for this compound as,
(image 2)
Therefore, the chemical formula of magnesium chloride is CaOCaO.
C.Copper nitrate
We have to know that the atomic number of copper is 2929 and has two atoms in the outermost shell for bonding. While a nitrate molecule has only one valence electron. We need 2 nitrate molecules to satisfy the valency of 1 copper atom.
We can apply the criss-cross method for this compound as,
(image 3)
Therefore, the chemical formula of magnesium chloride is Cu(NO3)2Cu(NO3)2.
D.Aluminium chloride
We have to know that the atomic number of aluminium is 13 and has a valency of 3 atoms and chlorine atom has a valency of 1. Since it has 7 electrons in the outermost shell. Thus, we need 3 chlorine atoms to satisfy the valency of 1 aluminium atom.
We can apply the criss-cross method for this compound as,
(image 4)
Therefore, the chemical formula of magnesium chloride is AlCl3AlCl3.
E.Potassium nitrate
We have to remember that the atomic number of potassium is 19 and has a valency of 1 and nitrate also has a valency of 1, since it needs one more atom to complete its octet. Hence, we need only one molecule of nitrate for one atom of potassium.
We can apply the criss-cross method for this compound as,
(image 5)
Therefore, the chemical formula of magnesium chloride is KNO3KNO3.
Note: As we know that the criss-cross method is the most efficient way to write the correct chemical formula of the molecule. It is generally used for finding out the formula of a bonding of a metal with a non-metal to form ionic bonds. Signs of the two ions are dropped, the ion value is crossed which becomes the subscript of the crossed atoms.
