Properties and Changes in Matter PROPERTIES OF MATTER

Physical Properties • Can be observed or viewed without changing the sample’s composition –

Properties Extensive • Properties that depend on the amount of substance present • Example:

Chemical Properties • How a substance interacts with another substance (ability or inability) •

Physical Changes • Alter a substance without changing the composition • Example: bend, grind,

Chemical Changes • Process in which a substance(s) is changed into one or more

Chemical Equation • Use of symbols to represent a chemical reaction • Example: CH

Reactants Products • Starting substances • Substances formed • Found on the left hand

Law of Conservation of Mass • Mass is neither created or destroyed during a

Chemical Reaction Signs • • • Bubbling (gas production) Color change Precipitate forms (solid

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Properties and Changes in Matter

PROPERTIES OF MATTER

Physical Properties • Can be observed or viewed without changing the sample’s composition – Example: density, color, odor, state of matter, boiling point, melting point, shape – Use your senses

Properties Extensive • Properties that depend on the amount of substance present • Example: Volume, mass Intensive • Properties that are independent of the amount of substance present • Can be used to identify a substance • Example: density, boiling point, temperature

Chemical Properties • How a substance interacts with another substance (ability or inability) • Example: iron can react with oxygen, carbon dioxide is not flammable

CHANGES IN MATTER

Physical Changes • Alter a substance without changing the composition • Example: bend, grind, crumple, split, phase change

Chemical Changes • Process in which a substance(s) is changed into one or more new substances • Example: combust, ferment, burn, rot, tarnish • Also known as a chemical reaction

Chemical Equation • Use of symbols to represent a chemical reaction • Example: CH 4 + O 2 → CO 2 + H 2 O

Reactants Products • Starting substances • Substances formed • Found on the left hand side • Found on the right of a chemical equation hand side of a chemical equation

Law of Conservation of Mass • Mass is neither created or destroyed during a chemical reaction • Mass of the reactants = mass of the products

Chemical Reaction Signs • • • Bubbling (gas production) Color change Precipitate forms (solid formation) Energy change (temperature change) The only way to know for sure is to check the composition before and after!!