I can statements

• I can develop models to describe the atomic composition of simple  molecules.

• I can develop models to describe the atomic composition of extended structures.

• I can analyze data on the properties of substances before and after the substances interact to determine if a  chemical reaction has occurred.

• I can interpret data on the properties of substances before and after the substances interact to determine if a  chemical reaction has occurred.

• I can develop a model to describe how the total number of  atoms remains the same during a chemical reaction and thus mass is conserved.

• I can use a model to describe how the total number of  atoms remains the same during a chemical reaction and thus mass is conserved.