- 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).
Topics
Chemical Reactions and Equations
- Chemical Reactions in Daily Life
- Chemical Equations
- Balancing Chemical Equation
- Types of Chemical Reactions > Combination Reaction
- Types of Chemical Reactions > Decomposition Reaction
- Types of Chemical Reactions > Single Displacement Reaction
- Types of Chemical Reactions > Double Displacement Reaction
- Chemical Properties of Carbon Compounds > Oxidation
- The Effects of Oxidation Reactions in Everyday Life
Acids, Bases and Salts
- Acids and Bases in Daily Life
- Acids and Bases in the Laboratory
- Acids and Bases React with Metals
- Reaction of Metal Carbonates with Acids
- Acids and Bases Reaction with each other
- Reaction of Metallic Oxides with Acids
- Reaction of a Non-metallic Oxide with Base
- Common Properties of Acids and Bases
- The pH Scale
- Importance of pH in Everyday Life
- Salts > Family of Salts
- Salts > pH of Salts
- Salts > Chemicals from Common Salt
- Salts > Water in Salt Crystals
Metals and Non-metals
Carbon and its Compounds
- Importance of Carbon
- The Covalent Bond
- Allotropes of Carbon > Diamond
- Allotropes of Carbon > Graphite
- Allotropes of Carbon > Fullerene
- Carbon: A Versatile Element
- Organic Compounds
- Classification of Hydrocarbons
- Carbon Compounds: Chains, Branches, Rings
- Homologous Series
- Nomenclature
- Chemical Properties of Carbon Compounds > Combustion
- Ethanol
- Ethanoic Acid
- Soaps and Detergents
Life Processes
- Life Processes in Living Organisms
- Nutrition
- Autotrophic Nutrition
- Heterotrophic Nutrition
- Nutrition in Human Beings
- Dental Caries
- Cellular Respiration
- Human Respiratory System
- Production of ATP
- Blood Circulatory System
- Human Heart
- Blood Vessels Entering and Leaving The Heart
- Valves of the Heart
- Blood Pressure (B.P.)
- Blood Vessels
- Composition of Blood > Cellular Elements: Blood Platelets (Thrombocytes)
- Tissue Fluid (Or Intercellular Fluid)
- Lymph and Lymphatic System
- Transportation in Plants
- Transportation of Water
- Transportation of Food and Other Substances
- Excretion
- Excretion in Human Beings
- Kidney and Its Internal Structure
- Structure of a Kidney Tubule (Nephrons)
- Dialysis and Artificial Kidney
- Excretion in Plants
- Organ and Body Donation
Control and Co-ordination
- Human Nervous System
- Neuron (Or Nerve Cell)
- Synapse
- Nerves
- Reflex Action
- Reflex Arc
- The Human Brain
- The Spinal Cord
- Mechanism of Muscle Action Under Nervous Control
- Coordination and Response to Stimuli in Plants
- Tropic Movements in Plants
- Phototropism
- Geotropism
- Hydrotropism
- Thigmotropism
- Chemotropism
- Hormonal Regulation in Animals
How do Organisms Reproduce?
Heredity
Light – Reflection and Refraction
- Light and Its Straight-Line Propagation
- Reflection of Light
- Spherical Mirrors
- Image Formation by Spherical Mirrors
- Representation of Images Formed by Spherical Mirrors
- Image Formation by Concave Mirror
- Image Formation by a Convex Mirror
- Sign Convention for Reflection by Spherical Mirrors
- Ray Optics - Mirror Formula
- Refraction of Light
- Refraction through a Rectangular Glass Slab
- The Refractive Index
- Refraction by Spherical Lenses
- Image Formation by Lenses
- Image Formation in Lenses Using Ray Diagrams
- Sign Convention for Spherical Lenses
- Lens Formula
- Power of a Lens
The Human Eye and the Colourful World
- The Human Eye
- Defects of Vision and Their Correction
- Defects of Vision and Their Corrections > Myopia
- Defects of Vision and Their Corrections > Hypermetropia
- Defects of Vision and Their Corrections > Presbyopia
- Refraction of Light Through a Prism
- Dispersion of Light
- Atmosphere Refraction
- Scattering of Light
Electricity
Magnetic Effects of Electric Current
- Magnetic Effect of Electric Current
- Applications of Biot-Savart's Law > Magnetic Field due to a Finite Straight Current-Carrying Wire
- Magnetic Field Due to a Current-Carrying Conductor
- Right-hand Thumb Rule
- Applications of Biot-Savart's Law > Magnetic Field at the Centre of a Circular Loop
- Applications of Ampere’s Circuital Law > Magnetic Field of a Long Straight Solenoid
- Force on a Current Carrying Conductor in a Magnetic Field
- Fleming’s Left Hand Rule
- Magnetism in Medicine
- Domestic Electric Circuits
Our Environment
- Definition: Combination Reaction
- Chemical Equations: Combination Reaction
- Key Points: Combination Reaction
CBSE: Class 10
Maharashtra State Board: 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
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
Maharashtra State Board: Class 10
Key Points: Combination Reaction
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
- Take a small amount of hydrochloric acid (HCl) in a test tube and heat it.
- Dip a glass rod in ammonia solution (NH₃) and hold it near the mouth of the test tube.
- 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
- Hold a magnesium strip with tongs and ignite it.
- 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
- Take water in a beaker up to half its capacity.
- Add a few pieces of calcium oxide (CaO) to the water.
- 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.
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Complete the table given below.
| Heat on Copper Nitrate | Colour of acidic gas evolved |
