04 August, 2010

Types of reactions:

Students of grade 7 were taken to the laboratory to perform experiments on the topic types of reactions.

Students were divided into groups of two, each performing a different experiment.

Two types of reactions were demonstrated followed by practicals.

1) Simple displacement reaction is a type of reaction in which one element displaces another element from a compound and takes its place.

A representation of the reaction is as follows:

A + BC → AC + B

Iron filings were put in a test tube containing blue colored copper sulphate. The iron displaces copper out from copper sulphate to form a green colored iron (II) sulphate. The displaced copper gets deposited on the iron filings.

Fe + CuSO4→ FeSO4 + Cu

(blue) (green)

2) Double Decomposition reaction is a type of reaction in which two substances react by exchanging their radicals.

A representation of the reaction is as follows:

AB + CD → AD +C B

Silver nitrate solution was added to a test tube containing sodium chloride solution. Silver nitrate and sodium chloride mutually exchange their radicals forming silver chloride and sodium nitrate.

AgNO3 + NaCl → AgCl + NaNO3

No comments: