Tag: CBSE 9th Science

  • 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…