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Chemical combination reaction: H₂ + Cl₂ = ?

Question:

Determine which substances should be inserted instead of the question mark in the equation: H₂ + Cl₂ = ?

Chemical reaction solution

This is a combination reaction between hydrogen (H₂) and chlorine (Cl₂). The result is hydrogen chloride (hydrochloric acid).

Answer: H₂ + Cl₂ = 2HCl

🧪 Determining the type of reaction

Hydrogen (H₂) and chlorine (Cl₂) are simple substances consisting of identical atoms. When they interact, a complex substance, hydrogen chloride (HCl), is formed. This is a typical combination reaction.

⚗️ Determining the reaction product

Hydrogen has a valency of I, and chlorine also has a valency of I. When combined, they form HCl - hydrogen chloride (hydrochloric acid in aqueous solution).

⚖️ Balancing the chemical equation

Initial equation: H₂ + Cl₂ → HCl

Left side: 2 hydrogen atoms, 2 chlorine atoms
Right side in HCl: 1 hydrogen atom, 1 chlorine atom
To balance, a coefficient of 2 must be placed before HCl

Balanced equation: H₂ + Cl₂ = 2HCl

Visual demonstration of the reaction

The diagram shows how atoms rearrange during a chemical reaction

H

H

H₂

hydrogen

+

Cl

Cl

Cl₂

chlorine

→

reaction

H

Cl

HCl

H

Cl

HCl

2 molecules of hydrogen chloride

(hydrochloric acid in aqueous solution)

🎯 Practical significance

HCl is used in industry for metal cleaning
Hydrochloric acid is used in the food industry
HCl is involved in digestion in the human stomach
Used to obtain metal chlorides

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