name any two feathers of chemical reactions and give one example of each
Answers
Explanation:
The 5 primary types of chemical reactions are: Combination reaction. Decomposition reaction.
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Combination Reaction. A reaction in which two or more reactants combine to form a single product is known as a combination reaction. ...
Decomposition Reaction. ...
Displacement Reaction. ...
Double Displacement Reaction. ...
Precipitation Reaction.
Explanation:
1.Evolution of gas:
The chemical reaction between zinc and dilute sulphuric acid is characterized by the evolution of hydrogen gas.
Zn(s)+H2SO4(aq)→ZnSO4(aq)+H2(g)
2.Change in colour:
The reaction between the lead nitrate solution and potassium iodide solution.
Pb(NO3)2(aq)+2KI→PbI2(s)+2KNO3(aq)
In this reaction colour changes from colourless to yellow.
3.Formation of precipitate:
The action of Barium Chloride on sodium sulphate.
BaCl2(aq)+Na2SO4(aq)→BaSO4(s+2KNaCl(aq)
4.Change in temperature:
The action of dilute sulphuric acid on zinc:
Zn(s)+H2SO4(aq)→ZnSO4(s)+H2(g)
In this reaction, heat is evolved.
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5.Change in the state:
When the wax is burnt in the form of the wax candle then water and carbon dioxide are formed. Wax is solid, water is a liquid whereas carbon dioxide is a gas.