[dropcap]W[/dropcap]When it is said that something is pure, it means that all the constituent particles of that substance are the same in their chemical nature. For ex. N2, O2, H2, Hg, sugar, common salt, water, iron, copper etc. Thus, a pure substance consists of a single type of particles. How can we identify a …
Pure Substances – The constituents of mixture can not be separated by simple physical methods. (i) Elements – Substance that cannot be decomposed into two or more different substances by a simple chemical process. e.g. hydrogen, oxygen (ii) Compounds – Substance of definite composition that can be decomposed into two or more different substances by a simple …
How do atoms exist? Atoms of elements exist in nature either in uncombined form or in combined form. (a) The atoms of some elements called the noble-gas elements (helium, neon, argon, krypton, xenon) are normally found in nature as isolated (single) atoms as they are chemically unreactive. (b) The atoms of most elements are chemically …
