CHM135H1 Chapter Notes - Chapter 2: Mercury(Ii) Oxide, Cathode Ray, Joseph Proust
90
CHM135H1 Full Course Notes
Verified Note
90 documents
Document Summary
2. 1 conservation of mass and the law of definite proportions. Robert boyle: the first to define an element as a substance which could not be chemically broken down into anything simpler. Joseph priestley: prepared and isolated oxygen gas by heating mercury(ii) oxide. Antoine lavoisier: discovered that the products of combustion are equal to the mass of the starting reactants: law of conservation of mass: mass is neither created nor destroyed in chemical reactions. Joseph proust: law of definite proportions: different samples of a pure chemical substance always contain the same proportion of elements by mass, elements combine in specific proportions and not in random proportions. 2. 2 dalton"s atomic theory and the law of multiple proportions. John dalton proposed a new theory of matter: elements are made up of tiny particles called atoms, each element is characterized by the mass of its atoms.
