SOLUTIONS TO THE TUTORIAL REVISION

SOLUTIONS TO REVISION(A)THE PANCH TATVA ARE EARTH, WATER, SKY, FIRE, AIR.ATOMS; MOLECULES.GREEK(A)DEMOCRITUSJOHN DALTONJOHN DALTON(A) THIS LAW STATES THAT THE MASS OF THE REACTANTS IS ALWAYS EQUAL TO THE MASS OF THE PRODUCTS IN A CHEMICAL REACTION.(B) IT SAYS THAT A COMPOUND ALWAYS CONTAIN THE SAME ELEMENTS COMBINED IN THE SAME PROPORTION.(i) THE ATOMS OF PARTICULAR ELEMENTS ARE ALIKE, BUT DIFFER FROM THE ATOMS OF OTHER ELEMENTS.(ii) ATOMS ARE INDESTRICUBLE.(iii) ATOMS COMBINE IN SMALL WHOLE NUMBERS TO FORM MOLECULES.(iv) AN ATOM OF AN ELEMENT HAS A CHARACTERISTIC MASS.THE DALTON’S ATOMIC THEORY WAS UNABLE TO EXPLAIN THE FOLLOWING THINGS – DISCOVERY OF ELECTRONS, PROTONS AND NEUTRONS.DISCOVERY OF ISOTOPES AND ISOBARS. PARTICLEPROTONELECTRONNEUTRONSYMBOLPenCHARGE+ve-veNeutralCHARGE IN COULOMBS+1.602 X 10-19 Coulombs-1.602 X 10-19 Coulombs0RELATIVE MASS11ABSOLUTE MASS1.67 X 10-219.10 X 10-251.67 X 10-21DISCOVERERE. GoldsteinJ.J. ThomsonJames ChadwickYEAR OF DISCOVERY19321897RESIDENCY OF THE DISCOVERERGerman physicistBritish physicistBritish physicist mass of a hydrogen atom.