Q1
What is matter made up of?
AAtoms and molecules
BOnly light
COnly energy
DNothing specific
ICSEClass 7 (ICSE)ScienceCh 8 · Topic 1
Matter and Its Composition
Matter is made up of tiny particles called atoms and molecules, and understanding this composition helps explain matter's properties and beh
Core concept
All matter is composed of atoms, the smallest units of an element, which combine to form molecules.
How it works
The arrangement and movement of particles differ in solids (tightly packed), liquids (loosely packed), and gases (widely spread).
Why it matters
Particle theory explains why solids hold their shape, liquids flow, and gases expand to fill their container.
Key detail
Understanding matter's composition helps explain physical properties like density, states of matter, and how substances interact.
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• Matter is made of atoms and molecules.
• Atoms are the smallest units of an element.
• Atoms combine to form molecules.
• Solids have tightly packed particles.
• Liquids have loosely packed particles.
• Gases have widely spread particles.
• Particle theory explains states of matter.
• This explains why solids, liquids and gases behave differently.