Chapter 1 Pages

 Properties of matter and changes of matter  Matter: anything that has mass and takes up space

 Any substance that has a definite composition ◦ Always made of the same stuff in exactly the same proportions  Examples: H 2 O, NaCl, C 12 H 22 O 11  All around us

 Changes in chemicals ◦ Ex: things growing, food cooking, taking a photo (film)  We use reactions to produce chemicals ◦ Ex: plastics, acids

 Solid, Liquid, Gas ◦ What is the difference between ice, water, steam?  Solid ◦ Definite shape, definite volume  Liquid ◦ No definite shape, definite volume  Gas ◦ No definite shape, no definite volume

 Properties that can be measured or observed without changing it’s identity ◦ Length, mass, color, odor, density, boiling point, melting point

 Matter can change ◦ Ice melts, water fogs a mirror, bike spokes rust, red clothes fade, milk sours  2 types of changes

 A change in which the identity of a substance does not change ◦ Change physical properties  Melting, freezing, dissolving, crushing, boiling

 Also called a chemical reaction  Things turn into something new  2 parts of a chemical reaction ◦ Reactants – things that react ◦ Products – things that are produced

Reactant + Reactant  Product + Product Propane + Oxygen  Carbon Dioxide + Water

 1 of 4 things must happen 1. A gas is produced 2. Formation of a precipitate 3. Release of heat and light 4. Color change