Write the balanced equation for the following by inserting the correct coefficients in the blanks.

If red spheres represent oxygen atoms, blue spheres represent nitrogen atoms, and all the molecules are gases,

b. write a balanced equation for the reaction.

If purple spheres represent iodine atoms, white spheres represent hydrogen atoms, and all the molecules are gases,

b. write a balanced equation for the reaction.

Cobalt(II) chloride, a blue solid, can absorb water from the air to form cobalt(II) chloride hexahydrate, a pink solid. The equilibrium is so sensitive to moisture in the air that CoCl₂ is used as a humidity indicator.

a. Write a balanced equation for the equilibrium. Be sure to include water as a reactant to produce the hexahydrate.

Write the names for the elements in each of the following formulas of compounds used in medicine:

c. Demerol, C₁₅H₂₂ClNO₂

Determine the total sum of the coefficients after balancing the following equation. 

What is meant by the term 'balanced equation'?

Why is it not possible to balance an equation by changing the subscript on a substance, say from H₂O to H₂O₂?

Which of the following equations are balanced? Balance those that need it.

a. CaC₂ + 2 H₂O → Ca(OH)₂ +C₂H₂

b. C₂H₈N₂ + 2 N₂O₄ → 2 N₂ + 2 CO₂ + 4 H₂O

c. 3 MgO + 2 Fe → Fe₂O₃ + 3 Mg

d. N₂O → N₂ + O₂