CLASS IX NCERT SCIENCE Chapter 2 Is Matter around us pure
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Matter (Based on constituent particles) Pure Substances Mixtures CompoundsHomogeneous Heterogeneous Mixtures Elements Mixtures
Pure Substances Fixed composition as single kind of particles. Only one kind of atoms or molecules. No impurities. r Cannot be separated into other kinds of matter by physical process Homogenous throughout its mass. Ex- Water, Sulphur.
Pure substances Elements compounds metals metalloids non metals
Elements Robert Boyle first scientist to use the term element. Basic form that cannot be broken down into more simpler forms by physical or chemical methods. Because made up of only one kind of atoms. Ex- hydrogen, carbon , iodine, bromine etc.
CI He SODIUM A nutrient in table salt CARBON Found in charcoal briquettes CHLORINE Used in swimming pools HELIUM Used to inflate balloons Ca Au AI Si SOCA ALUMINUM Used in oda can SILICON Used to build computer chips CALCIUM GOLD A nutrient in dairy products Ancient currency and ornament Examples of Elements
There are 118 elements known at present Out of which 94 elements occur in nature while 24 elements are man-made. Majority elements are solid, 11 are gases and only 2 are liquid i.e. bromine and mercury.
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