Question

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Answer 1

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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.

Answer 2

1. Atoms are defined as “the basic building blocks of matter”. It is the smallest constituent unit of matter that posses the properties of the chemical element. ... Molecules consist of one or more atoms bound together by covalent (chemical) bonds.
2. It states that matter can neither be created nor destroyed. It stated that a given compound always contains exactly the same proportion of elements by weight.
3. The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

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