The Arithmetic of Equations Using Balanced Equations Balanced

The Arithmetic of Equations

Using Balanced Equations • Balanced equations help processes carried out in manufacturing to be economical.

Balanced Equations • Example: Parts to make a tricycle: frame(F), seat(S), wheels(W), handlebars(H), and pedals(P) • F + S + 3 W + H + 2 P FSW 3 HP 2 • This is the balanced equation for making a single tricycle • This shows you how you can use a balanced equation to manufacture a specific number of tricycles.

Balanced Chemical Equations • Balanced chemical equations are the recipes that tell chemists what amounts of reactants to mix and what amounts of products to expect. • You can determine the quantities of reactants and products in a chemical reaction from a balanced chemical equation. • When you know the quantity of one substance in a reaction, you can calculate the quantity of any other substance consumed or created in the reaction.

Stoichiometry • The calculation of quantities in chemical reactions is a subject of chemistry called stoichiometry. • Calculations using balanced equations are called stoichiometric calculations.

Interpreting Chemical Equations • You can describe a chemical reaction in terms of quantities of products and reactants. These quantities include the number of molecules, atoms, and moles; mass; and volume. • Two quantities – number of atoms and mass – do not change during a reaction. • In any chemical reaction, the number of atoms of each reactant equals the number of atoms of that reactant in the products. • The mass of the reactants equals the mass of the products.