What happens when : (give balanced chemical equations only)

1. Caustic soda reacts with carbon dioxide
2.caustic soda reacts with zinc hydroxide
3.potassium reacts with oxygen
4.sodium carbonate is fused with silicon dioxide
5. when bleaching powder reacts with hydrochloric acid

You probably should have this information from lecture notes or the text. Go through those first, then post what you don't understand here. The first equation is given here but you must balance it.

NaOH + CO2 ==> Na2CO3

To determine the balanced chemical equations for the given reactions, we need to understand the chemical formulas of the reactants and products involved in each reaction. Let's go through each reaction step-by-step:

1. Caustic soda (sodium hydroxide, NaOH) reacts with carbon dioxide (CO2):
The chemical equation is given by:
2 NaOH + CO2 → Na2CO3 + H2O

2. Caustic soda (sodium hydroxide, NaOH) reacts with zinc hydroxide (Zn(OH)2)
The chemical equation is given by:
2 NaOH + Zn(OH)2 → Na2ZnO2 + 2 H2O

3. Potassium (K) reacts with oxygen (O2):
The chemical equation is given by:
4 K + O2 → 2 K2O

4. Sodium carbonate (Na2CO3) is fused with silicon dioxide (SiO2):
The chemical equation is given by:
Na2CO3 + SiO2 → Na2SiO3 + CO2

5. Bleaching powder (calcium hypochlorite, Ca(ClO)2) reacts with hydrochloric acid (HCl):
The chemical equation is given by:
Ca(ClO)2 + 2 HCl → CaCl2 + H2O + Cl2

By following the rules of conservation of mass and charge, we can balance the chemical equations for these reactions.