Q1
What is matter made up of?
AAtoms and molecules
BOnly light
COnly energy
DNothing specific
ICSEClass 7 (ICSE)ScienceCh 8 · Topic 2
Practice and Revision - Matter and Its Composition
Let us practise and revise what we learned about matter and its composition. Matter is made up of tiny particles called atoms and molecules,
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.