Question

Identify any ten chemical reactions taking place around you and try to write the
corresponding balanced chemical equations yourself.​

Answer 1

The ten chemical reactions taking place around us are:

(1) The rusting of iron:

Fe + O2 + H2O → Fe2O3.xH2O

(2) Photosynthesis:

6 CO2(g) + 6 H2O(l) + Energy → C6H12O6(s) + 6 O2(g)

(3) Acid-Base Neutralization (like in case of acidity in the stomach)

NaHCO3(s) + HCl (aq) → NaCl (s) + CO2 (g) + H2O (l)

(4) Burning of carbon:

C + O2 → CO2

(5) Aerobic Respiration:

C6H12O6 (s) + 6 O2 (g) → 6 CO2 (g) + 6 H2O (l) + energy

(6) Anaerobic Respiration:

C6H12O6 (s) → 2 C2H5OH(aq) + 2 CO2 (g) + Energy

(7) Combustion of octane in engines:

2 C8H10 (l) + 21 O2 (g) → 16 CO2 (g) + 10 H2O (g)

(8) The formation of the ozone layer:

3 O2 (g) → 2 O3 (g)

(9) Tarnishing of Silver:

Ag (s) + S (s) → AgS (s)

(10) Copper vessels turn green on exposing to moist air:

2Cu(s) + H2O (l) + CO2(g) + O2(g) → Cu(OH)2(s) + CuCO3(s)

Answer 2

Answer:

Concept:

Chemical reactions take place around you and their corresponding chemical equations.

Explanation:

1. Synthesis of ammonia.

Reaction: $3 \mathrm{H}_{2}(\mathrm{~g})+\mathrm{N}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{NH}_{3}(\mathrm{~g})$

Hydrogen gas and nitrogen gas are combined in the presence of a catalyst at a high temperature and pressure to produce ammonia gas.

2. Combustion of hydrogen / Electrolysis of water

Reaction: $2 \mathrm{H}_{2(g)}+\mathrm{O}_{2(\mathrm{~g})} \leftrightarrows 2 \mathrm{H}_{2} \mathrm{O}_{[\mathrm{l}]}$

Hydrogen gas and oxygen combine to produce liquid water.

3. Combustion of methane (hydrocarbons)

Reaction: $\mathrm{CH}_{4(\mathrm{~g})}+2 \mathrm{O}_{2(\mathrm{~g})} \rightarrow \mathrm{CO}_{2(\mathrm{~g})}+2 \mathrm{H}_{2} \mathrm{O}_{(\mathrm{g})}$

Methane gas and oxygen gas combine exothermically to produce carbon dioxide gas and water vapor.

4. Photosynthesis

Reaction: $\mathrm{CO}_{2(\mathrm{~g})}+6 \mathrm{H}_{2} \mathrm{O}_{(1)} \rightarrow 6 \mathrm{O}_{2(\mathrm{~g})}+\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6(\mathrm{aq})}$

Carbon dioxide and water combine in the presence of sunlight (and many biologically catalyzed reactions) to produce oxygen and glucose (sugar).

5. Synthesis of sulfuric acid

Reaction: $2 \mathrm{~S}(\mathrm{~s})+3 \mathrm{O}_{2}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow 2 \mathrm{H}_{2} \mathrm{SO}_{4(\mathrm{aq})}$

Sulfur is first oxidized to sulfur dioxide and then to sulfur trioxide. This gas is bubbled through water to produce sulfuric acid. There are other methods to synthesize this substance.

6. Equilibrium of carbonic acid and carbon dioxide gas.

Reaction: $\mathrm{H}_{2} \mathrm{CO}_{3}(\mathrm{aq}) \leftrightarrows \mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_{2} \mathrm{O}_{(\mathrm{l})}$

Carbonic acid breaks down to produce carbon dioxide gas and liquid water.

7. Biological formation of calcium carbonate.

Reaction: $\mathrm{Ca}^{2+}(\mathrm{aq})+\mathrm{CO}_{3}{ }^{2-}{ }_{(\mathrm{aq})} \rightarrow \mathrm{CaCO}_{3(\mathrm{~s})}$

Calcium ions combine with carbonate ions to produce insoluble calcium carbonate.

8. Rusting of iron.

Reaction: $4 \mathrm{Fe}_{(\mathrm{s})}+3 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{Fe}_{2} \mathrm{O}_{3(\mathrm{~s})}$

Iron metal combines with oxygen gas to produce iron (III) oxide.

9. Production of hydrogen from the action of acid on metal.

Reaction: $\mathrm{Zn}+\mathrm{H}_{2} \mathrm{SO}_{4(\mathrm{aq})} \rightarrow \mathrm{H}_{2(\mathrm{~g})}+\mathrm{ZnSO}_{4(\mathrm{aq})}$

Zinc combined with sulfuric acid produces hydrogen gas and soluble zinc sulfate.

10. Oxidation of alcohol.

Reaction: $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}_{(1)}+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CH}_{3} \mathrm{COOH}_{(\mathrm{aq})}+\mathrm{H}_{2} \mathrm{O}_{\text {(l) }}$

Ethyl alcohol and oxygen produce acetic acid and water.

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