The equation is already balanced:
CaCO3(s) --> CaO(s) + CO2(g)
Explanation
A balanced chemical equation is one where the number of atoms on both sides are equal. Chemical equations must be balanced because there is only a rearrangement of atoms in a reaction so the number of atoms you start off with must be the same as the number of atoms you end up with.
If we take a look at the equation, we can see that there is 1 calcium atom, 1 carbon atom and 3 oxygen atoms present on both sides. As the number of these atoms on both sides are equal, the equation is balanced.
The balanced chemical equation for the reaction between calcium carbonate (CaCO3) and hydrogen (H2) to form calcium oxide (CaO) is: CaCO3 + H2 -> CaO + CO2
The balanced equation for hydrochloric acid (HCl) reacting with calcium carbonate (CaCO3) is: 2HCl + CaCO3 -> CaCl2 + CO2 + H2O.
The balanced molecular equation for the reaction between CaBr2 and NaCO3 is: CaBr2 + 2NaCO3 -> CaCO3 + 2NaBr.
The equation is Ca(OH)2 + CO2 = CaCO3 + H2O.
The balanced chemical equation is Ca(OH)2 + Na2CO3 + 2HNO3 → Ca(NO3)2 + 2NaOH + CO2 + H2O
The balanced chemical equation for the reaction between calcium carbonate (CaCO3) and hydrogen (H2) to form calcium oxide (CaO) is: CaCO3 + H2 -> CaO + CO2
The answer is TWO (2)Na2CO3 + CaCl2 --> 2 NaCl + CaCO3
The balanced equation for the reaction between hydrochloric acid (HCl) and calcium carbonate (CaCO3) is: 2HCl + CaCO3 -> CaCl2 + H2O + CO2.
The balanced equation for hydrochloric acid (HCl) reacting with calcium carbonate (CaCO3) is: 2HCl + CaCO3 -> CaCl2 + CO2 + H2O.
The balanced molecular equation for the reaction between CaBr2 and NaCO3 is: CaBr2 + 2NaCO3 -> CaCO3 + 2NaBr.
The balanced chemical equation for this reaction is: CaCO3 --> CaO + CO2. Therefore, x would be calcium oxide (CaO).
The equation is Ca(OH)2 + CO2 = CaCO3 + H2O.
The balanced chemical equation is Ca(OH)2 + Na2CO3 + 2HNO3 → Ca(NO3)2 + 2NaOH + CO2 + H2O
The chemical equation is not balanced. A balanced equation would be: KOH + H2SO4 -> KHSO4 + H2O
The chemical equation is not balanced. It should be balanced as follows: H2 + Cl2 → 2HCl
The coefficient of HCl in the balanced equation is 2. This is because the balanced equation shows that 1 molecule of CaCl2 reacts with 1 molecule of H2CO3 to form 1 molecule of CaCO3 and 2 molecules of HCl.
The balanced equation is: CaCl2 + H2CO3 -> CaCO3 + 2HCl. So, the coefficient needed is 2 in front of HCl to balance the reaction.