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1. Periodic and Non periodic changes
2. Reversible and Irreversible changes
3. Physical and chemical changes
4. Desirable and Undesirable changes
5. Slow and Fast changes
6. Natural and Man made changes

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Useful for CBSE, ICSE, NCERT & International Students Grade :6 Subject : Chemistry Lesson : Changes Around us Topic: PERIODIC AND NON PERIODIC CHANGES Changes which are repeated after regular intervals are called periodic changes. The occurrence of day and night and even the change of periods in your school are examples of periodic changes.

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Chemical & Physical Changes of Matter CLEAR & SIMPLE

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1. https://www.quia.com/quiz/303980.html
2. http://www.edinformatics.com/math_science/a_p_chem.htm