VIEWS: 2 PAGES: 1 POSTED ON: 1/6/2012
Balancing Chemical Equations • A chemical reaction is the process by which the atoms the atoms of one or more substances are rearranged to form different substances. • Some chemical reactions are hard to see while others are very obvious as they release large amounts of energy or there is a color change. • The starting substances in a chemical reaction are the reactants and the ending substances are the products. • A chemical equation is one in which the chemical formulas of the reactants and the products are shown separated by an arrow pointing to the products (right). • The Law of Conservation of Matter states that matter cannot be created or destroyed in a chemical reaction. Therefore, the same number of each element must be present in the reactants and the products. • This is called a balanced equation. Coefficients are numbers placed in from of the different compounds in the chemical equation to balance it. Balancing Equations Step 1 – Write the skeleton equation. Be sure to put the reactants on the left and the products on the right. NaOH + CaBr2 Ca(OH)2 + NaBr Step 2 – Count the atoms of each element of each side. Reactant: Na – 1 Product: Na - 1 OH – 1 OH - 2 Ca – 1 Ca - 1 Br – 2 Br – 1 Step 3 – Adjust the coefficients. 2NaOH + CaBr2 Ca(OH)2 + 2NaBr Step 4 – Check to see that the coefficients are at the lowest possible ratio. Step 5 – Recount the atoms Reactant: Na – 2 Product: Na - 2 OH – 2 OH - 2 Ca – 1 Ca - 1 Br – 2 Br – 2
"Balancing Chemical Equations(3)"