Law of constant proportion

THIS PPT CONTAINS contents related to the law of constant proportion of class 9th CBSE

1. Class - 9 th Laws of chemical combination (Part- 2) Bittu Kumar Integrated B.Sc. - B.Ed. School of Education, LPU

2. Law of constant proportion

3. The law of constant proportions was given by Proust in 1779 .

4. A chemical compound always consists of the same elements combined together in the same proportion by mass. law of constant proportions

5. W ater is a compound C onsists of 2 hydrogen and 1 Oxygen atom E xample

6. S ame constant proportion of 1 : 8 by mass (1 part by mass of hydrogen and 8 parts by mass of oxygen) Water

7. Decompose 100 grams of pure water -----11 grams (H) + 89 grams (O2) R epeat this experiment by taking pure water from different sources (like river, sea, well, etc.), the same masses of hydrogen and oxygen elements are obtained in every case. This experiment shows that water always consists of the same two elements, hydrogen and oxygen, combined together in the same constant proportion of 11 : 89 or 1 : 8 by mass. And this is the law of constant proportions.

8. In an experiment, 1.288 g of copper oxide was obtained from 1.03 g of copper. In another experiment, 3.672 g of copper oxide gave, on reduction, 2.938 g of copper.

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