Class 7 Science - ICSE-CHEMISTRY
Matter
The chapter 'Matter' in Class 7 ICSE Chemistry introduces students to the fundamental building blocks of everything around us. It covers the definition of matter, its general characteristics, and the three primary states of matter: solid, liquid, and gas. Students will explore the particulate nature of matter, inter-particle space, and inter-particle forces of attraction to understand why solids are rigid, liquids flow, and gases expand. Additionally, the chapter explains the phenomenon of change of state through heating and cooling, such as melting, vaporization, condensation, and freezing. This foundational topic is crucial for scoring well in ICSE Chemistry board exams as it forms the basis for advanced chemical bonding and physical chemistry concepts in higher classes.
Start Learning FreeKey Concepts
Matter
Anything that has mass, occupies space, and can be perceived by our senses is called matter.
Inter-particle Space
The empty space present between the constituent particles (atoms or molecules) of matter.
Inter-particle Force
The force of attraction between the particles of matter that holds them together, which is strongest in solids and weakest in gases.
Change of State
The process by which matter changes from one physical state to another, such as solid to liquid, upon the absorption or release of heat.
Latent Heat
The heat energy absorbed or released during a change of state without causing any change in the temperature of the substance.
Important Formulas
Board Exam Info
In ICSE Chemistry (Class 7), this chapter typically carries around 5 to 8 marks in the terminal examinations. Common question types include defining key terms, giving scientific reasons for properties of states of matter, differentiating between solids, liquids, and gases based on particle arrangement, and explaining processes like sublimation and vaporization.
Frequently Asked Questions
Why do gases fill the entire container available to them?
Gases have very weak inter-particle forces of attraction and extremely large inter-particle spaces, allowing their particles to move freely in all directions at high speeds.
Why does the temperature not rise during melting even though heat is being supplied?
The heat supplied is used entirely as latent heat of fusion to overcome the forces of attraction between solid particles, changing its state rather than increasing its kinetic energy.
What is the difference between evaporation and boiling?
Evaporation is a surface phenomenon that occurs at any temperature below the boiling point, whereas boiling is a bulk phenomenon that occurs at a fixed temperature throughout the liquid.
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