5. Classification & Balancing of Chemical Reactions

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

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

Determine whether each of the following chemical equations is balanced or not balanced:

d.

Balance each of the following chemical equations:

c. Sb₂S₃(s) + HCl(aq) → SbCl₃(aq) + H₂S(g)

Balance each of the following chemical equations:

d. Al(s) + HCl(aq) → H₂(g) + AlCl₃(aq)

Balance each of the following neutralization equations:

a. HCl(aq) + Mg(OH)₂(s) → H₂O(l) + MgCl₂(aq)

Balance each of the following neutralization equations:

a. HNO₃(aq) + Ba(OH)₂(s) → H₂O(l) + Ba(NO₃)₂(aq)

High temperature combustion processes, such as in combustion engines and coal-fired power plants, can result in the reaction of nitrogen and sulfur with oxygen to form nitrogen oxides (NO_𝓍) and sulfur oxides (SO_𝓍), where x can vary. These NO_𝓍 and SO_𝓍 compounds subsequently undergo further reaction in the atmosphere to create acidic compounds that contribute to acid rain.

a. Do some research to determine the common products that are formed (i.e., what are the values of x) for the reactions of N and S with oxygen. Write balanced equations for these reactions.

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