CHE-1101 Lecture Notes - Lecture 9: Chemical Equation, Unified Atomic Mass Unit, Molecular Mass

• School: App State
• Department: Chemistry
• Course: CHE-1101
• Professor: Liyana Ariyadasa

Document Summary

The reactants are on the left and the products are on the right. Reactants are the starting materials and products are the end products. When determining the number of atoms of an element, multiply the coefficient of the element by the subscript of the element. Balancing chemical equations is based on the law of conservation of mass, which states that during a chemical equation mass is not gained or lost. When balancing chemical equations, you have to change the coefficients of the reactants and products until the number of each element is balanced. To do this, start with an element that is only one reactant and only in one product. # of oxygens: combination reactions: 2 substances react to form one product, decomposition reaction: one substance breaks down into 2 or more substances, combustion reaction: typically involve oxygen and usually result in a flame. Formula weight is the total of the atomic weights of each element in a chemical formula.