Category : 10th Class
The chemical reactions are of following types
Combination reactions are those chemical reaction in which two or more elements or compounds combine together to form a single compound. e.g. Hydrogen and nitrogen reacts to form ammonia
e.g. Burning of carbon
For white washing solution of calcium hydroxide (slaked lime is used). It combines with carbon dioxide in air to form a layer of calcium carbonate which gives a shiny appearance to the surface of wall.
Those reactions in which single reactant breaks down to give simpler product.
e.g. Ferrous sulphate crystal on heating loses water and decomposes to form ferric oxide , sulphur di oxide and sulphur trioxide.
Those reactions in which more reactive element displaces the less reactive element from its salt solution. e.g.
The reactivity of metals can be known from the reactivity series of metals which is as follows:
Double Displacement Reaction
Double displacement reaction are those reactions in which two compounds interchange their ions and form two new compounds. e.g.
Precipitation reactions are double displacement reactions in which one of the compounds formed is insoluble. This insoluble compound is called precipitate and it settles at the bottom.
Those reactions in which simultaneous oxidation and reduction reactions take places.
Oxidation reactions: Those reactions which involves:
(i) Addition of oxygen
Here hydrogen is oxidized.
(ii) Removal of hydrogen.
Here hydrogen sulphide is oxidized
Reduction reaction: Those chemical reactions which involve
(i) Addition of hydrogen.
(iii) Removal of hydrogen
Here, Zinc Oxide is reduced.
Redox reaction: The reaction in which both reduction and oxidation takes place simultaneously is called redox reaction. e.g. \[ZnO+C\to Zn+CO\]
Oxidizing agents are those substances which can either donate oxygen or gain hydrogen.
Reducing agents are those substances which can either donate hydrogen or gain oxygen
(Oxidizing agent) (Reducing agent)
Thus we can say that loss of 0 is reduction and loss of H oxidation.
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