CHE 105 Lecture 2: Chapter 2

• School: University of Kentucky
• Department: Chemistry
• Course: CHE 105
• Professor: Josh Owen

Document Summary

Modern atomic theory and the laws that led to it. Law of conservation of mass in a chemical reaction, matter is neither creator nor destroyed. The mass of the reactants must equal the mass of the products. Law of definite proportions no matter what mass the ratio has to be the same. Law of multiple proportions elements combined to form more than one type of compound. Dalto(cid:374)s" ato(cid:373)i(cid:272) theor(cid:455) (cid:894)(cid:1005)8(cid:1004)8(cid:895: each element is composed of tiny, indestructible particles called atoms, all atoms of a given element are identical. The atoms of one element are different from all other elements: compounds are composed of atoms of one or more than one element. The relative number of atoms of each element on a given compound is always the same: a chemical reaction involved only the separation, combination or rearrangement of atoms. Atoms are not created or destroyed in a chemical reaction.