Two Hydrogen atoms are bonded with one Oxygen atom. H2O.
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The "2" in the formula for water (H2O) indicates that one molecule of water is composed of two hydrogen atoms and one oxygen atom bonded together. It represents the ratio of hydrogen to oxygen atoms in a water molecule.
The formula for the sulfate ion is SO4^2-. The prefix "AG" may indicate silver, in which case the formula would be Ag2(SO4)2.
It is called a subscript. For example: In the formula for water (H2O), 2 is the subscript indicating that there are 2 hydrogen atoms in the compound .
The chemical formula of lime-water is Ca(OH)2, which is calcium hydroxide.
The chemical formula for water, liquid, solid or gaseous is the same - H2OIn some texts you will find a little cursive L in brackets to indicate that it is liquid, or a little g to indicate gas, or a little s to indicate solid.
Yes, "aq" is commonly used in chemistry to indicate that a compound is dissolved in water, meaning it is in an aqueous solution. It helps to specify the state of the compound in a chemical reaction or formula.