CrO4-2
This is an impossible reaction. However if you turn it around and do AgNO3 plus K2CrO4 then it is equal to Ag2CrO4 plus 2KNO3.
Silver chromate is not soluble in water.
The chemical formula of silver phosphide ia Ag3P. The ion of silver is Ag+.
The chemical formula for sodium selenide is Na2Se.
This is not a chemical formula or equation.
The chemical formula for aluminum chloride is AlCl3. This is because the aluminum ion carries a 3+ charge, while the chloride ion carries a 1- charge. To balance the charges, three chloride ions are needed for every one aluminum ion.
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K+ is the chemical symbol for the potassium ion, which has a positive charge. PO4^3- is the chemical formula for the phosphate ion, which has a negative three charge.
The formula for barium nitride would be Ba3N2. This is because the 2+ charge of barium needs three nitride ions (each with a 3- charge) to balance out the charges in the compound.
Cobalt phosphate has the chemical formula Co3(PO4)2.
The chemical formula for NH is ammonia (NH₃) and the chemical formula for CO is carbon monoxide. When they react, they form the compound HCN (hydrogen cyanide).
H2O is 2 hydrogens plus 1 oxygen and that makes the chemical formula for water.