Pure Substances

Mr. SkirbstPhysical Science

Topic 12

Pure Substances

Pure Substances

Made of only one kind of material and has definite

properties

Pure SubstancesElements –

simplest pure substance

Pure SubstancesElements –

simplest pure substanceAtoms – basic building

block of all matter (simplest part of an element)

Pure SubstancesElements –

simplest pure substanceAtoms – basic building block

of all matter (simplest part of an element)

Symbols – element shorthand

Pure SubstancesCompounds –

- pure substance made of more than one element (chemically combined)- can be chemically broken down

Pure SubstancesCompounds –

- pure substance made of more than one element (chemically combined)- can be chemically broken downMolecule – smallest part of a compound keeping characteristics

Chemical FormulasShorthand for chemical

substances(ex. H2O, NaCl, CO2, HCl)

Subscript - # of atoms

Chemical EquationsShorthand for chemical reactionEx.

Coefficient - # of moleculesYields – arrow indicating

direction of reaction

Chemical Equations2 Fe + 3 S Fe2S3

(reactants) (yields) (products)