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Types of Chemical Reactions > Combination Reaction

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Topics

  • Definition: Combination Reaction
  • Chemical Equations: Combination Reaction
  • Key Points: Combination Reaction
CBSE: Class 10
Maharashtra State Board: Class 10

Definition: Combination Reaction

A reaction in which a single product is formed from two or more reactants is known as a combination reaction.

OR

When two or more reactants combine in a reaction to form a single product, it is a combination reaction.

CBSE: Class 10
Maharashtra State Board: Class 10

Chemical Equations: Combination Reaction

  • C + O₂ → CO₂
  • 2H₂ + O₂ → 2H₂O
  • 2Mg + O₂ → 2MgO
CBSE: Class 10
Maharashtra State Board: Class 10

Key Points: Combination Reaction

  • A combination reaction is a reaction where two or more substances combine to form a single product.
    Example: CaO + H₂O → Ca(OH)₂
  • Combination reactions are often exothermic, meaning they release heat.
    Example: Reaction of quick lime with water.
  • Respiration is an exothermic reaction where glucose combines with oxygen to release energy.
    C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy
  • One product is formed in combination reactions, regardless of the number of reactants (usually 2 or more).
Maharashtra State Board: Class 10

Introduction:

A combination reaction, also known as a synthesis reaction, occurs when two or more substances chemically combine to form a single new compound. This type of reaction is the opposite of a decomposition reaction, where a compound breaks down into simpler substances.

For example, when magnesium (Mg) burns in oxygen (O₂), it forms magnesium oxide (MgO) as a new product:

Mg + O₂ → MgO

Maharashtra State Board: Class 10

Types of Chemical Change or Chemical Reaction

A chemical change, or chemical reaction, is a process where substances transform into new products with different properties through the breaking and formation of chemical bonds. Unlike physical changes, chemical changes are typically irreversible and result in substances with distinct chemical and physical characteristics.

  • Chemical reactions are essential in both natural and industrial processes, including metabolism, medicine production, and material synthesis. Based on their nature and effects, chemical reactions are classified into combination, decomposition, displacement, double displacement, oxidation-reduction (redox), and exothermic/endothermic reactions.
  • Each type follows specific principles and occurs under certain conditions, making them significant in various scientific and technological applications. This classification helps in systematically studying chemical changes, enabling scientists and engineers to utilise them effectively in industries, laboratories, and everyday life.
Maharashtra State Board: Class 10

Experiment

1. Aim: To observe and understand combination reactions, where two or more substances combine chemically to form a single product.

2. Requirements

  • Apparatus: test tube, beaker, glass rod, tongs, burner.
  • Chemicals: Hydrochloric acid (HCl), ammonia solution (NH₃), magnesium strip (Mg), calcium oxide (CaO), water (H₂O).

3. Procedure

Activity 1: Reaction of Ammonia and Hydrogen Chloride

  1. Take a small amount of hydrochloric acid (HCl) in a test tube and heat it.
  2. Dip a glass rod in ammonia solution (NH₃) and hold it near the mouth of the test tube.
  3. Observe the formation of white smoke due to the reaction of NH₃ and HCl, forming ammonium chloride (NH₄Cl).

NH₃(g) + HCl(g) → NH₄Cl(s)

Activity 2: Burning of Magnesium in Air

  1. Hold a magnesium strip with tongs and ignite it.
  2. Observe the formation of white ash (magnesium oxide, MgO) due to the reaction between magnesium and oxygen.

2Mg + O₂ → 2MgO

Activity 3: Reaction of Calcium Oxide with Water

  1. Take water in a beaker up to half its capacity.
  2. Add a few pieces of calcium oxide (CaO) to the water.
  3. Observe the formation of calcium hydroxide (Ca(OH)₂) with the release of heat.

CaO + H₂O → Ca(OH)₂ + Heat

4. Conclusion: A combination reaction occurs when two or more reactants chemically combine to form a single product. These reactions can release heat (exothermic) and are commonly observed in various chemical and industrial processes.

Video Tutorials

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