Distinguishing Elements and CompoundsElementsCompoundsKey DifferencesBreaking down compoundsProperties of CompoundsBoth are Substances

Substances and MixturesSubstances MixturesDefinite compositionCan be separated

chemicallyElements and

compounds

Variable compositionCan be separated

PhysicallyHomogeneousHeterogeneous

Symbols and FormulasUsed to represent elements and compoundsChemical Short HandChemical symbols1st letter is always capitalized2nd letter is never capitalizedChemical FormulasSmall whole number ratio of elements

presentH2O

Section 2.3 ReviewHow are compounds different from elements?How can you distinguish a substance from a

mixture?What are chemical symbols and formulas

used for?Name methods used to break down

compounds into simpler substances.

Sec 2.3 review cont.ID each of the following as an element,

compound, or mixture.Table sugarCough syrupTap waterNitrogenAirCarbon dioxide

Compound AnalysisAcetaminophenC8H9O2N

Name the elements and their ratio in this compound