Structure of Atom for class 7

Structure of Atom for class 7

1. A PRESENTATION ON CHEMISTRY STRUCTURE OF MATTER BY AVISHI SHARMA CLASS 7 H MENTOR MR.PRINCE SACHDEVA

2. WHAT IS MATTER MATTER IS ANYTHING WHICH HAS SOME MASS OR VOLUME OR WHICH COVERS SPACE

3. ATOM . MATTER IS MADE UP OF SEVERAL SMALL PARTICLES Called atom. ATOM IS THE BASIC UNIT OF MATTER

4. WHAT IS MOLECULE MOLECULE When two or more atom are linked together they make a larger particle called molecule. Molecule can be made up of like or alike atom eg .Oxygen gas molecule is made up of two oxygen atoms bonded together

5. pure substance A pure chemical substance is any matter that has a fixed chemical composition and characteristic properties. for example, Oxygen, is a pure chemical substance that is a colorless, odorless gas at 25°C

6. WHAT IS ELEMENT ELEMENTS – An  element , such as gray, metallic sodium, is a substance that cannot be broken down into simpler ones by chemical changes there are 118 elements known today and 96 in nature and rest by humans There are two types of elements which will be introduced in further classes

7. What is compound COMPOUNDS- A pure substance containing two or more elements combined together in a fixed proportion by weight can be decomposed into these element by suitable method eg - H 2 O etc.

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