Class 9 Science

NCERT Class 9 Science Solution, Notes , Atoms and molecules

Atoms and molecules 33.Mass of 1 mole of a substance is called its molar mass 34.Atoms of different elements are…

2 years ago

NCERT Class 9 Science Solution, Notes, Atoms and molecules

NCERT Class 9  Atoms and molecules NCERT Class 9 science subject 25.Rules for writing formula of compound: Formula of compound…

2 years ago

NCERT Class 9 Science Solution, Notes, Atoms and molecules

Atoms and molecules An ion is a charged particle and can be negatively or positively charged A negatively charged ion…

2 years ago

NCERT Class 9 Science Solution, Notes, Atoms and molecules

Atoms and molecules One atomic mass unit is a mass unit equal to exactly one twelfth(1/12th) the mass of one…

2 years ago

NCERT Class 9 Science Solution, Notes, Atoms and molecules

Atoms and molecules Atoms are building block of all matter Atomic radius is measured in nanometres (1 m = 109…

2 years ago

NCERT Class 9 Science Solution, Notes, Atoms and molecules

Atoms and molecules 1.        Laws of chemical combination Law of conservation of mass: Mass can neither be created nor destroyed…

2 years ago

NCERT Class 9 Science Lesson Structure of atom Solution and Notes

Structure of atom Ionisation of gases in the discharge tube proved that atoms have subatomic particles Summary of characteristics of…

2 years ago