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✦define atom and molecule:-
A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge.
✦what are the laws of chemical combination
There are five basic laws of chemical combination that govern the chemical combinations of elements:
Law of Conservation of Mass.
Law of Definite Proportions.
Law of Multiple Proportions.
Gay Lussac's Law of Gaseous Volumes.
Avogadro's Law.
✦state the law of conservation of mass. explain by taking an example
The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.
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