Question

. Какая реакция относится к реакциям замещения: а) Al2O3+HCl→, б) Na2O + H2O→, в) Fe + H2SO4 →, г) CaCO3 →.

Answer 1

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в

Answer 2

А) Al2O3+6HCl=2AlCl3+3H2O
В)2Fe+3H2SO4=Fe2(SO4)3+3H2

Answer 3

Reactions of Substitution

a) Al2O3 + HCl →

The reaction of Al2O3 with HCl does not result in a simple substitution reaction. Aluminum oxide (Al2O3) is amphoteric, meaning it can react with both acids and bases. When it reacts with hydrochloric acid (HCl), it forms aluminum chloride and water. The balanced chemical equation for this reaction is:

2Al2O3 + 6HCl → 2AlCl3 + 3H2O

This reaction involves the formation of aluminum chloride and water, and it does not fit the typical pattern of a substitution reaction.

b) Na2O + H2O →

The reaction of sodium oxide (Na2O) with water (H2O) results in the formation of sodium hydroxide (NaOH). This is a classic example of a base reacting with water to form a hydroxide ion. The balanced chemical equation for this reaction is:

Na2O + H2O → 2NaOH

This reaction does not fit the pattern of a substitution reaction, as it involves the formation of a hydroxide compound without the direct replacement of any elements.

c) Fe + H2SO4 →

The reaction of iron (Fe) with sulfuric acid (H2SO4) results in the formation of iron(II) sulfate and hydrogen gas. The balanced chemical equation for this reaction is:

Fe + H2SO4 → FeSO4 + H2

This reaction does not fit the pattern of a substitution reaction, as it involves the formation of iron sulfate and hydrogen gas without the direct replacement of any elements.

d) CaCO3 →

The decomposition of calcium carbonate (CaCO3) upon heating results in the formation of calcium oxide (CaO) and carbon dioxide (CO2). This is not a substitution reaction, but rather a decomposition reaction where a compound breaks down into simpler substances. The balanced chemical equation for this reaction is:

CaCO3 → CaO + CO2

This reaction involves the decomposition of calcium carbonate into calcium oxide and carbon dioxide, and it does not fit the typical pattern of a substitution reaction.

In summary, none of the given reactions fit the pattern of substitution reactions. Each reaction involves different chemical processes such as amphoteric behavior, formation of hydroxides, acid-base reactions, and decomposition, rather than direct substitution of elements.