Q1
What is a pure substance?
AA substance with fixed composition
BA combination of substances
CA type of force
DA type of mixture
ICSEClass 6 (ICSE)ScienceCh 11 · Topic 1
Pure Substances and Mixtures
A pure substance has a fixed composition, like an element or compound, while a mixture combines substances that keep their individual proper
Core concept
A pure substance, like gold or water, has a consistent composition throughout and specific, definite properties.
How it works
A mixture, like sand and salt or salad, combines two or more substances that are not chemically bonded and can be separated.
Why it matters
Mixtures can be homogeneous (uniform throughout, like saltwater) or heterogeneous (not uniform, like a salad).
Key detail
Mixtures can be separated using physical methods like filtration, evaporation, or sorting, since substances aren't chemically combined.
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• A pure substance has a fixed composition.
• Examples: gold, water.
• A mixture combines substances without chemical bonding.
• Examples: sand and salt, salad.
• Homogeneous mixtures are uniform, like saltwater.
• Heterogeneous mixtures are not uniform, like salad.
• Mixtures can be separated by physical methods.
• Methods include filtration, evaporation and sorting.