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IV. Answer briefly., 1., , State the law of conservation of mass., , 2., , State the law of constant, , 3., 3, 4., , proportions., , Write the, , properties of anode rays., Define valency of an element with respect, to hydrogen., , 5. Define the term ions or radicals., , 3.

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DIT., , as, , ne, on, , d, , during the, , chemical, , change, , was, , stated by, , a, , French chemist Lavoisier in 1774 It states, that during any chemical change, the total, total, mass of the products, is equal to the, mass, , of the, , reactants.)In, , other words the law, , af conservation of mass means that mass can

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Properties of Anode rays, , Anode rays travel in straight lines., Anode rays are made up of material particles., , Anode, , rays, , are, , magnetic fields., , by electric and, Since, they are deflected, , deflected, , towards the negatively charged plate, they, consist of positively charged particles., The properties of anode rays depend upon, the nature of the gas taken inside in the, , discharge tube.|3

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uITTtCU as tiIe, , of the other, , elements, , STallddra., , are, , valenci6, , expressed, , in terms, , of hydrogen. Thhus| valency of an element can, also be defined as the number of, hydrogen, atoms which combine with one atom of it) n, , hydrogen, , chloride molecule,, , one, , hydrogen

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atoms of different elements, , collectively lose, , or, , gain electrons to acquire _positive or negative, charge. Thus we can say, n atom or a, group of, atoms when they either lose or, gain electrons, get, converted into ions or radicals, , 5

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4.8 Chemical Equation, , A, , chemical, , representation of, , equation is, a, , short hand, , chemical reaction with, , rthe help of chemical symbols, tie, , a, , Every chemical equation, , and formulae.), , has two, , components: