Q1
How is matter classified in chemistry?
APure substances or mixtures
BOnly solids
COnly liquids
DOnly gases
ICSEClass 8 (ICSE)ScienceCh 9 · Topic 1
Matter (Chemistry)
In chemistry, matter is studied at the atomic and molecular level, understanding its composition, properties, and how substances interact.
Core concept
Matter can be classified as pure substances (elements and compounds) or mixtures, based on whether it has a fixed or variable composition.
How it works
The properties of matter, both physical (like colour, density) and chemical (like reactivity), help us identify and classify substances.
Why it matters
Changes of state and chemical reactions both involve rearrangement of particles, though chemical reactions form entirely new substances.
Key detail
Understanding matter at this level helps us predict how substances will behave and interact in different conditions and reactions.
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• Matter is studied at atomic and molecular level in chemistry.
• It's classified as pure substances or mixtures.
• Pure substances have fixed composition.
• Physical properties: colour, density.
• Chemical properties: reactivity.
• Changes of state rearrange particles.
• Chemical reactions form new substances.
• Understanding matter predicts substance behaviour.