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what is double displacement reaction?give example and explain the example. what is thermal decomposition?give examples and explain the examples

what is double displacement reaction?give example and explain the example.
 
what is thermal decomposition?give examples and explain the examples

Grade:10

1 Answers

Vasanth Bhaskara
401 Points
7 years ago
Double displacement reaction:-
Take about 3 ml of Sodium sulphate solution in a test tube.
In another test tube take about 3 ml of Barium chloride
Mix the two solutions
 
We will observe a white precipitate. 
Any reaction which produces a precipitate can be called a precipitate reaction
 
Na2SO4(aq) + BaCl2(aq) -------------> BaSO4(s) + 2NaCl(aq)
Sodium sulphate + Barium chloride -----------------> Barium sulphate + Sodium chloride
 
A double displacement reaction, also known as a double replacement reaction or metathesis, is a type of chemical reactionwhere two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products
 
Thermal decomposition:-
Thermal decomposition, or thermolysis, is a chemical decomposition caused by heat. The decomposition temperature of a substance is the temperature at which the substance chemically decomposes. The reaction is usually endothermic as heat is required to break chemical bonds in the compound undergoing decomposition
, which is an industrially important product.quick limeThe reaction is used to make  CaCO3 → CaO + CO2

  • Some oxides, especially of weakly electropositive metals decompose when heated to high enough temperatures. A classical example is the decomposition of mercuric oxide to give oxygen and mercury metal. The reaction was used by Joseph Priestley to prepare samples of gaseous oxygen for the first time.
  • When water is heated to well over 2000 °C, a small percentage of it will decompose into OH, monotomic oxygen, monotomic hydrogen, O2, and H2.
  • The compound with the highest known decomposition temperature is carbon monoxide at ≈3870 °C (≈7000 °F)
 
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