1 PPOGIL Concept How can atoms be counted Why Consider the

Last updated: 5/11/2023

1 PPOGIL Concept How can atoms be counted Why Consider the following equation for a chemical reaction 2 H O 2 H O This can be interpreted as two molecules of hydrogen and one molecule of oxygen combining to form two water molecules But how often do chemists limit their reactions to one or two molecules Usually a reaction is done with an unimaginable number of molecules How then do chemists know they have the right mix The molecules need to be quickly counted How do we count molecules The answer is the unit called the mole Weighing is often easier than counting Model 1 The Balanced Equation How can the coefficients in a chemical equation be interpreted Consider the reaction 1 CuCl 2 Ag 2 AgCl 1 Cu Key Questions 1 What are the coefficients for each of the following substances in the reaction