Question

1. Elemental boron (as a gas) is produced in one industrial process by heating diboron trioxide with magnesium metal, also producing magnesium oxide as a by-product. Write the unbalanced chemical equation for this process. (Omit states-of-matter from your answer.)

2. Nitrous oxide gas (systematic name: dinitrogen monoxide) is used by some dental practitioners as an anesthetic. Nitrous oxide (and water vapor as byproduct) can be produced in small quantities in the laboratory by careful heating of ammonium nitrate. Write the unbalanced chemical equation for this reaction. (Omit states-of-matter from your answer.)

3. Plumbers, welders, or glass blowers often use the gas acetylene (C₂H₂) because it burns in oxygen with a very hot flame. The products of the combustion of acetylene are carbon dioxide and water vapor. Write the unbalanced chemical equation for this process. (Include states-of-matter under the given conditions in your answer.)

4. Balance each of the following chemical equations. (Use the lowest possible coefficients.)

(a)  Be₂C(s) +  H₂O(l) →  Be(OH)₂(s) +  CH₄(g)

(b)  CH₄(g) +  O₂(g) →  CO₂(g) +  H₂O(g)

(c)  NH₃(g) +  CO₂(g) →  (NH₂)₂CO(s) +  H₂O(g)

(d)  K₂SO₄(aq) +  BaCl₂(aq) →  BaSO₄(s) +  KCl(aq)

(e)  BaO₂(s) +  H₂O(l) →  Ba(OH)₂(aq) +  O₂(g)

(f)  NH₃(g) +  O₂(g) →  NO(g) +  H₂O(l)

(g)  K(s) +  H₂O(l) →  KOH(aq) +  H₂(g)

(h)  Mg(s) +  Mn₂O₃(s) →  MgO(s) +  Mn(s)

5.Balance each of the following chemical equations. (Use the lowest possible coefficients.)

(a)  Fe₂O₃(s) +  HNO₃(aq) →  Fe(NO₃)₃(aq) +  H₂O(l)

(b)  C₂H₅OH(l) +  O₂(g) →  CO₂(g) +  H₂O(g)

(c)  C₃H₈(g) +  O₂(g) →  CO₂(g) +  H₂O(g)

(d)  NH₃(g) +  O₂(g) →  NO(g) +  H₂O(g)

(e)  FeCO₃(s) +  H₂CO₃(aq) →  Fe(HCO₃)₂(aq)

(f)  KClO₃(aq) +  HBr(aq) →  Br₂(l) +  H₂O(l) +  KCl(aq)

Answer 1