Matter in our surroundings Class 9 Notes CBSE Science Ch 1
CBSE NCERT Class 9 Revision Notes Science contains physics, chemistry and biology notes of chapter 1 Matter in our surroundings topics given in textbook are part of Revision Notes for Class
Science Notes cover an overview of the main given points of every concepts and Topics in the NCERT TextBooks Class 9th Revision Science this Chapter Notes includes topic/concepts wise explanations for all the topic provided in the book such as
• Physical and chemical classification • Molecular theory of matter • Molecular structures and properties
• Solids, • Liquids, and • Gases are the three types of matter.
It is categorised as • Elements based on its chemical properties.
Compounds and mixtures.
The majority of matter exists as a combination of two or more pure elements.
Well prepared Class 9th Science All Chapters Notes will guidance students understand the topics ,concepts and themes covered in all the chapters of Ncert Text book of 9th Revision Notes
Matter in our surroundings
** Physical Nature of Matter **
Every matter is made cles which differ in from other up of certain parti- in Shape, size and nature types of matter the particles of matter very Small.
* Characteristics of particles of Matter.
Particles of Matter have Space between them.
Particles of Matter are continuously moving. and They posses an energy called kinetic energy. As the temperature rises. The Kinetic energy of the particle increases hence, particles moving fast.
Particles of matter attract each other. A force of attraction exists between the particles called Intermolecular force of Attraction cohesive force.
Diffusion : Intermixing of particles of two different type of matter. Their own is called diffusion.
States of matter :- Solid, Liquid,
** Properties of solid.
Solid State have definite shape.
Have distinct boundaries. and Incompressibility. Have Rigidity and Have definite volume.
Properties of liquid state
Have fluidity (Not rigid).
Low compressibility. No definite shape and boundaries.
Have definite volume.
* Properties of Gaseous.
Have fluidity and high compressibility. Have Have no no definite boundaries. definite shape and volume.
Change in Physical state of Matter be done in two ways: can by changing the temperature:
Melting point: The temperature at which Solid melts to form atmospheric form liquid at pressure.
{The melting point of ice. is 273.15 k
The process of melting is also known as fusion.
As the heat energy is absorbed by ice in temperature,
Without Showing any is considered that it gets. hidden inte The contents and is known as the Latent heal.
The amount of heat energy. that change 1kg of a is require Solid into liquid
Sailing pain! The temperature at which CL Liquid boils to form atmospheric pressure. Vapours at is called boiling point Boiling point of H20. is 372k / 200's.
Latent heat of vaporization - The amount of beat required to change 1kg liquid. to its gaseous Heat freezing Solid State state at atmospheric pressure THeat Liquid state Gaseous State cooling At 25°C
Water is Liquid water is Solid (ice) Water is Gaseous (Steam). At 100° c
Sublimation Change of solid directly into Уа heating without passing on through Liquid state. Ex Camphor is called Sublimation. → Vapour
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