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Answer:
A chemical reaction is in which the bonds are broken within reactant molecules, and new bonds are formed within product molecules in order to form a new substance.
Types of Chemical Reactions
The basis for different types of reactions is the product formed, the changes that occur, the reactants involved and so on. Different types of reactions are
Combustion reaction
Decomposition reaction
Neutralization reaction
Redox Reaction
Precipitation or Double-Displacement Reaction
Synthesis reaction
1. Combustion Reaction
A combustion reaction is a reaction with a combustible material with an oxidizer to give an oxidized product. An oxidizer is a chemical a fuel requires to burn, generally oxygen. Consider the example of combustion of magnesium metal.
2Mg+O2→2MgO+Heat
Here, 2 magnesium atoms react with a molecule of oxygen producing 2 molecules of the compound magnesium oxide releasing some heat in the process.
2. Decomposition Reaction
A Decomposition reaction is a reaction in which a single component breaks down into multiple products. Certain changes in energy in the environment have to be made like heat, light or electricity breaking bonds of the compound. Consider the example of the decomposition of calcium carbonate giving out CaO (Quick Lime) which is a major component of cement.
CaCO3(s)→HeatCaO(s)+CO2(g)
Decomposition Reaction
Here, the compound Calcium carbonate when heated breaks down into Calcium Oxide and Carbon Dioxide.
3. Neutralization Reaction
A Neutralization reaction is basically the reaction between an acid and a base giving salt and water as the products. The water molecule formed is by the combination of OH– ions and H+ ions. The overall pH of the products when a strong acid and a strong base undergo a neutralization reaction will be 7. Consider the example of the neutralization reaction between Hydrochloric acid and Sodium Hydroxide giving out sodium chloride(Common Salt) and water.
HCl+NaOH→NaCl+H2O
Here, an acid and a base, Hydrochloric acid and Sodium Hydroxide react in a neutralization reaction to produce Sodium Chloride(Common Salt) and water as the products.
4. Redox Reaction
A REDuction-OXidation reaction is a reaction in which there is a transfer of electrons between chemical species. Let us consider the example of an electrochemical cell-like redox reaction between Zinc and Hydrogen.
Zn+2H+→Zn2++H2
Here, A Zinc atom reacts with 2 ions of positively charged hydrogen to which electrons get transferred from zinc atom and hydrogen becomes a stable molecule and Zinc ion is the product.
5. Precipitation or Double-Displacement Reaction
It is a type of displacement reaction in which two compounds react and consequently, their anions and cations switch places forming two new products. Consider the example of the reaction between silver nitrate and sodium chloride. The products will be silver chloride and sodium nitrate after the double-displacement reaction.
AgNO3+NaCl→AgCl+NaNO3
Double-Displacement Reaction
Here, Silver Nitrate and Sodium Chloride undergo a double displacement reaction. Wherein Silver replaces Sodium in Sodium Chloride and Sodium joins with Nitrate becoming Sodium Nitrate along with the Silver Chloride as the product.
6. Synthesis Reaction
A Synthesis reaction is one of the most basic types of reaction wherein multiple simple compounds combine under certain physical conditions giving out a complex product. The product will always be a compound. Let us consider the Synthesis reaction of sodium chloride with reactants solid sodium and chloride gas.
2Na(s)+Cl(g)→2NaCl(s)
Here, we have 2 Atoms of solid Sodium reacting with Chlorine gas giving out Sodium Chloride viz. Common Salt as the product.
Explanation:
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Explanation:
combination reaction- lithium reacting with sulfur to give lithium sulfide.
decomposition reaction - CaCO3 → CaO + CO2.
Neutralization reaction- When Sodium hydroxide is added to hydrochloric acid.
displacement reaction- Reaction of iron nails with copper sulphate solution.
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