Class 8 Science - ODISHA
Particulate Nature of Matter
The chapter 'Particulate Nature of Matter' introduces Class 8 students under the Odisha BSE board to the building blocks of everything around us. It explores the microscopic world, proving that matter is made up of tiny particles called atoms and molecules. Students will learn about the three states of matter—solid, liquid, and gas—and how the arrangement and movement of particles explain their physical properties, such as compressibility, diffusion, and interconversion of states. This chapter forms the foundation of chemistry and is crucial for scoring well in board exams, frequently appearing in conceptual and reasoning questions.
Start Learning FreeKey Concepts
States of Matter
Matter exists in three main states: solid, liquid, and gas, which differ based on the spacing and attraction between their constituent particles.
Intermolecular Space
The empty space present between the particles of matter, which is least in solids and maximum in gases.
Intermolecular Force
The attractive force between particles that holds them together; it is strongest in solids and weakest in gases.
Diffusion
The spontaneous mixing of particles of two different types of matter on their own, caused by the motion of particles.
Compressibility
The property of matter by virtue of which its volume can be reduced by applying pressure, prominently seen in gases.
Important Formulas
Board Exam Info
In the Odisha BSE Class 8 Science examinations, this chapter typically carries around 5 to 8 marks. Questions commonly include short-answer reasoning questions, state differences between solids, liquids, and gases, and define key terms like diffusion and intermolecular force.
Frequently Asked Questions
Why can we compress gases easily but not solids?
Gases have large intermolecular spaces between their particles, allowing them to be pushed closer together when pressure is applied. Solids have negligible space between their tightly packed particles.
What causes the smell of hot sizzling food to reach us several metres away?
It is due to the rapid diffusion of food vapours into the air. Heat increases the kinetic energy of the particles, making them move faster.
Why do liquids flow while solids do not?
In liquids, the intermolecular forces are weaker than in solids, allowing the particles to slide past one another. In solids, rigid forces lock the particles in fixed positions.
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