Have you ever wondered why sand piles up but water flows away? Or why the fragrance of incense spreads throughout a room? The particulate nature of matter explains these daily-life phenomena.
Matter, whether solid, liquid, or gas, consists of extremely tiny particles that we cannot see with our eyes. These particles have spaces between them, attract each other, and are always in motion.
The arrangement and movement of particles give rise to different states of matter. In this chapter, you will learn how the properties of solids, liquids, and gases depend on inter-particle spacing, attraction, and motion.
Particulate Nature of Matter Worksheet
Our worksheets include different types of practice questions like MCQs, fill in the blanks, and short and long answers. Learn the fundamental concept of matter being made up of tiny particles. Understand inter-particle forces, spacing, and movement in solids, liquids, and gases through simple experiments and real-life examples.
With our engaging and well-structured worksheets, students can reinforce their classroom learning, prepare for exams, and develop a strong foundation in science.
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- Matter is made up of particles
Matter is not continuous but made of very small particles called constituent particles.
These particles are too small to be seen with a simple microscope.
Examples: Grinding chalk → chalk powder → still chalk; Dissolving sugar → spreads into water particles.
- Characteristics of particles of matter
- Very small in size.
- Have spaces between them (interparticle space).
- Held together by interparticle forces of attraction.
- Particles are always in motion.
- Effect of Heat on Particles
- Heat increases particle motion.
- Solids melt at melting point.
- Liquids boil at boiling point.
- Evaporation occurs at all temperatures.
- Movement of particles
Shown by experiments with potassium permanganate in water and incense stick fragrance in air.
Movement increases with temperature.
- Real-life applications
- Perfume/fragrance spreading.
- Dissolving sugar/salt in water.
- Soap cleaning oily stains.
Particulate Nature of Matter Extra Question Answers
Q1. What is matter composed of?
Ans. Matter is composed of extremely small particles called constituent particles, such as atoms and molecules.
Q2. What is interparticle space?
Ans. The empty space present between constituent particles of matter is called interparticle space.
Q3. Why do solids have a fixed shape?
Ans. Because their particles are tightly packed with strong interparticle forces, preventing free movement.
Q4. Why can gases be compressed easily?
Ans. Gases have large interparticle spaces, which can be reduced on applying pressure.
Q5. Why does the smell of perfume spread quickly in a room?
Ans. Because gas particles move freely in all directions and help fragrance particles mix with air.
Q6. Describe how heating affects the state of matter with the example of ice.
Ans. When ice is heated, particles vibrate vigorously until they overcome attractive forces, changing into water at 0°C (melting point). On further heating, water boils at 100°C (boiling point) and changes into vapour, where particles move freely.