9th Class Chemistry Notes

Chapter 8 Chemical Reactivity 9th Class Chemistry Notes

Chapter 8 Chemical Reactivity 9th Class Chemistry Question#1) Define metals? What are the different groups of metals? Answer: METALS Metals are the elements (except hydrogen) which are electropositive and form cations by losing electrons.   Classification of Metals: Metals can be categorized. Very reactive:potassium, sodium, calcium, magnesium and aluminium. Moderately reactive :zinc, iron, tin and …

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Chapter 5 PHYSICAL STATES OF MATTER 9th Class Chemistry

PHYSICAL STATES OF MATTER 9th Class Question#1) What is Matter? Write a note on different physical states of matter? Answer: Matter: Any thing that has mass and occupy space is called matter. Matter exists in three physical states. 1) Gas.  2) Liquid.  3) Solid. 1) Gas or Gaseous state: State of matter that has neither fixed …

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STRUCTURE OF MOLECULE 9th Class Chemistry Chapter 4

Chapter#4   STRUCTURE OF MOLECULE 9th Class   Question#1) Define atom? Why do atoms forms chemical bond (Formation of Molecule)? Atom: Smallest entity of an element that show all the properties of that element and can enter into a chemical reaction is called atom. WHY DO ATOMS FORM CHEMICAL BONDS? 0R WHY DO ATOMS REACT? Answer: Atoms …

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Chapter 3 Periodic Table 9th Class Chemistry Notes

Chapter 3 Periodic Table 9th Class Chemistry Notes Question#1: Define Periodic table? What is the importance of periodic table? Answer: Periodic Table:- Periodic table is the arrangement of elements in order of increasing atomic number in such a way that those with similar properties are placed one above other in the form of a table. OR Periodic table …

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Chapter 2 STRUCTURE OF THE ATOM 9th Class Chemistry Notes

Chapter 2 STRUCTURE OF THE ATOM 9th Class Chemistry Notes   Q#1) What is atom? Write in short words about history of atoms? Answer: In 585 B.C, Ancient Greek philosopher Democritus suggested that matter is composed of tiny indivisible particles called atoms.The name ATOM was derived from the Latin word Atomos meaning indivisible. Daltons Atomic Theory : In 1808 …

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