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# Unit 1: Matter, Measurement, and Experimental Analysis ## Enduring Understandings * Matter is conserved because atoms are conserved in chemical and physical processes. The law of conservation of matter (mass) states that, regardless of how substances within a closed system are changed, the total...

# Unit 1: Matter, Measurement, and Experimental Analysis ## Enduring Understandings * Matter is conserved because atoms are conserved in chemical and physical processes. The law of conservation of matter (mass) states that, regardless of how substances within a closed system are changed, the total mass remains the same. * The products formed in a chemical reaction have different properties than the original reactants. * Chemical formulas are used to represent compounds. Subscripts represent the relative number of each type of atom in a molecule or formula unit. * Matter consists of atoms held together by electromagnetic forces. * Matter exists as different substances which can be utilized based on their properties. * Intramolecular bonds form between atoms to achieve stability. ## Essential Knowledge and Skills * Distinguish between chemical and physical properties * Distinguish between pure substances/mixtures, homogeneous/heterogeneous mixtures * Classify elements as metals, metalloids, or nonmetals * Name chemical formulas for binary covalent and ionic compounds * Recognize the relationship between types of compounds, names and the use of "formula units" versus "molecules" * Calculate the percent yield and percent error for a given procedure. * Describe the purpose and implementation of chromatography, filtration, decanting, magnetic separation, evaporation, and centrifugation for separating mixtures ## Examples of Separation Techniques * **Decantation:** separating sand and water * **Evaporation:** separating salt from water * **Filtration:** straining pasta * **Chromatography:** separating pigments * **Distillation:** distilling alcohol * **Centrifugation:** separating blood components