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CBSE IX Science | Matter – Nature and Behaviour: NCERT Exercise – 2
Matter – Nature and Behaviour: NCERT Exercise – 2 Question 1. What is meant by a pure substance? Answer. A pure substance is a single substance or matter which can not be separated into other kind of matter by any physical process. All elements and compounds are pure substances. Question 2. Differentiate between homogeneous and…
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CBSE 9th Science | Matter around us: Concept review
CBSE 9th Science | Matter around us: Concept review QUICK CONCEPT REVIEW SUBSTANCE (OR CHEMICAL SUBSTANCE): A “substance” is a kind of matter that can not be separated into other kinds of matter by any physical process, e.g. gold, silver, iron, sodium chloride, calcium carbonate etc. [NOTE: Most of the naturally occurring materials on…