what is the chemical reactions for these...
2Na+2H2O->2NaOH+H2
2FeS2+3O2->Fe2O2+2SO2
CaCO3->CO2+CaO
The chemical reactions you mentioned are:
1. 2Na + 2H2O -> 2NaOH + H2:
This is the reaction of sodium (Na) with water (H2O) to produce sodium hydroxide (NaOH) and hydrogen gas (H2). To balance this equation, you need to ensure that the number of atoms on both sides of the equation is equal. In this case, there are two sodium atoms on both sides, two oxygen atoms on both sides, and four hydrogen atoms on both sides. The balanced equation is:
2Na + 2H2O -> 2NaOH + H2.
2. 2FeS2 + 3O2 -> Fe2O3 + 2SO2:
This is the reaction between iron pyrite (FeS2) and oxygen (O2) to produce iron(III) oxide (Fe2O3) and sulfur dioxide (SO2). To balance this equation, you need to make sure that the number of atoms on both sides is equal. In this case, there are two iron atoms on both sides, four sulfur atoms on both sides, and six oxygen atoms on both sides. The balanced equation is:
2FeS2 + 3O2 -> 2Fe2O3 + 4SO2.
3. CaCO3 -> CO2 + CaO:
This is the decomposition reaction of calcium carbonate (CaCO3) into carbon dioxide gas (CO2) and calcium oxide (CaO). To balance this equation, you need to ensure that the number of atoms on both sides is equal. In this case, there is one calcium atom on both sides, one carbon atom on both sides, and three oxygen atoms on both sides. The balanced equation is:
CaCO3 -> CO2 + CaO.
Remember, when balancing chemical equations, you want to ensure that the number of atoms (of each element) on both sides of the equation is the same.