Two liquid reactants hydrazine and dinitrogen tetraoxide reacts to form gaseous nitrogen and water vapor. Write the chemical reaction for this process. Solution:
1. Write a skeleton equation in which the reactants are on left and products on right side.
N2H4 + N2O4 $\rightarrow$ N2 + H2O
2. Indicate the physical state after the formula for reactant and products.
N2H4(l) + N2O4(l) $\rightarrow$ N2(g) + H2O(g)
3. Balance the equation.
2N2H4(l) + N2O4(l) $\rightarrow$ 3N2(g) + 4H2O(g)
This is the final balanced equation for the reaction of hydrazine with dinitrogen tetraoxide.
Crystals of sodium hydroxide react with carbon dioxide from air to form a colorless liquid, water and a white powder, sodium carbonate which is commonly added to detergents as a softening agent. Write a balanced equation for this chemical reaction. Solution:
1. Write the skeleton equation for this reaction in which reactants on left side and products on right side.
NaOH + CO2 $\rightarrow$ Na2CO3 + H2O
2. Represent the physical state after the formulas of reactants and products.
NaOH(s) + CO2(g) $\rightarrow$ Na2CO3(s) + H2O(l)
3. Balance the chemical equation.
2NaOH(s) + CO2(g) $\rightarrow$ Na2CO3(s) + H2O(l)
This is the final balance equation for the reaction between sodium hydroxide and carbon dioxide in air.