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sodium and potassium
KCl is the chemical formula unit of potassium chloride not a chemical equation.
Because the calcium cation has a +2 charge and the nitrate anion has a -1 charge. Thus, it takes 2 of the nitrate anions (NO3-) to balance the charge of the calcium cation (Ca^2+). Because the nitrate anion is a polyatomic anion, the parentheses are used to avoid confusion and to show there are 2 of the polyatomic anions.
If your goal is to balance the equation, then yes, you have to chose the coefficients.
No because you always keep an equation in balance when solving it
s + p =
It is impossible to balance that equation.
2 KNO3 ↔ 2 KNO2 + O2
2NaCl(aq) + Ca(NO3)2(aq) -> 2NaNO3(aq) + CaCl2(aq)
No Reaction
weight of the container
The compound formed is calcium nitrate, Ca(NO3)2. Calcium forms a +2 ion and the nitrate polyatomic forms a -1 ion. In order to balance out the charges, you need two nitrate ions to bond with one calcium. This ratio is reflected in the formula, which places the nitrate in parentheses with the "2" subscript outside it, which means there are two of them.
Ca + Cl2 -> CaCl2
The reaction is the following:AgNO3 + KI = KNO3 = AgI(s)
If the copper nitrate formed is copper (I) nitrate, the equation balances with one atom of each metal and one formula weight of each nitrate. If the copper nitrate formed is copper (II) nitrate, the balanced equation is: 2 AgNO3 + Cu -> 2 Ag + Cu(NO3)2.
sodium and potassium
Cu(NO3)2 an NaCl don't react, so there is not a balanced equation.