When we study chemistry, terms such as molecules, atoms, ions, and many more keep bouncing around in the air. They are significant and have very precise meanings in the world of science.
As asked in the Atoms And Molecules Class 9th NCERT chapter, do atoms and molecules have a large impact on the world around us? Do we need to know about them to improve our understanding of the science environment?
Atoms and molecules class 9 NCERT is an important topic that lays the foundation of chemistry in the years ahead.
All of these questions with their atoms and molecules class 9th NCERT solutions will be answered in the chapter, Atoms and Molecules, the gist of which is given below.
Chemicals exist all around us in nature. Their existence, just like everything in science, comes with a specific set of rules. These rules help us understand the compositions of the things around us and also theorise the reasons behind the various behaviours of chemicals.
Law of Conservation of Mass
The law of conservation of mass says that mass can neither be created nor destroyed. It means that whatever happens in a chemical reaction, the mass recorded initially and finally will be exactly the same.
Law of Constant Proportions
The law of constant proportions, according to atoms and molecules class 9th NCERT solutions, tells us that any specific compound will have the same constituents in itself, regardless of how it was created, and who was involved in the preparation.
These laws are also mentioned in NCERT chapter class 9th science Atoms and Molecules. Using these laws, British chemist John Dalton gave the following postulates about his theory on the nature of matter:
(i) All matter is made of very tiny particles called atoms.
(ii) Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.
(iii) Atoms of a given element are identical in mass and chemical properties.
(iv) Atoms of different elements have different masses and chemical properties.
(v) Atoms combine in the ratio of small whole numbers to form compounds.
(vi) The relative number and kinds of atoms are constant in a given compound.
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