s stands for solid, and g stands for gas. For completeness sake I will include the fact that l stands for liquid. Hence, the symbols refer to which 'state' the chemicals/compounds in a chemical equation are in.
e.g. if you see H2O (g) this means water vapour/steam. if you see H2O (l) this means liquid water. if you see H2O (s) this means solid/frozen water i.e. ice.
The chemical equation for the reaction between aluminum and steam is 2Al(s) + 3H2O(g) → Al2O3(s) + 3H2(g).
The chemical equation for the decomposition of sodium carbonate (Na2CO3) is: 2Na2CO3(s) → 2Na2O(s) + 2CO2(g) + O2(g).
The chemical equation for the thermal decomposition of lead nitrate is: 2Pb(NO3)2(s) → 2PbO(s) + 4NO2(g) + O2(g)
The chemical equation for the oxidation of carbon to carbon dioxide is: C(s) + O2(g) -> CO2(g)
The balanced equation is: 2Cr(s) + 3Cl2(g) → 2CrCl3(s)
The chemical equation for the reaction between aluminum and steam is 2Al(s) + 3H2O(g) → Al2O3(s) + 3H2(g).
The chemical equation for the decomposition of sodium carbonate (Na2CO3) is: 2Na2CO3(s) → 2Na2O(s) + 2CO2(g) + O2(g).
The chemical equation for the thermal decomposition of lead nitrate is: 2Pb(NO3)2(s) → 2PbO(s) + 4NO2(g) + O2(g)
The chemical equation for the oxidation of carbon to carbon dioxide is: C(s) + O2(g) -> CO2(g)
The balanced equation is: 2Cr(s) + 3Cl2(g) → 2CrCl3(s)
The balanced chemical equation for the reaction of calcium carbonate (CaCO3) is: CaCO3(s) -> CaO(s) + CO2(g)
2Na (s) + O2 (g) ---> 2Na2O (s)
The balanced chemical equation for bismuth heated strongly in oxygen is: 4 Bi(s) + 3 O2(g) → 2 Bi2O3(s)
The balanced chemical equation for the formation of Fe2O3 from Fe and O is: 4Fe + 3O2 -> 2Fe2O3
The balanced chemical equation for heating magnesium metal is: 2Mg(s) + O2(g) -> 2MgO(s)
Cl2(g) + 2NaI(s) --------> 2NaCl(s) + I2(s)
it is a combustion. the word equation would be: sulfur + oxygen → sulfur dioxide the balanced chemical equation: S(s) + O₂(g) → SO₂(g)