NEW UNIT: UNIT 3 fold next section in your notes TOPIC: Properties of Matter Do Now: 1) Define Matter: 2)Fill in page 2 in packet mass space Anything that has mass and occupies space

Properties – used to characterize matter Physical –how they look Chemical – how they react with others

Physical Properties Describe the appearance and form of matter Words: color, texture, luster, odor, solid, liquid, gasMeasurements: a number and a unit

A sample of CO 2 (s) and a sample of CO 2 (g) different in their 1) chemical composition 2) empirical formula 3) molecular structure 4) physical properties

Other physical properties include Density, boiling point (BP), and melting point (MP) (where can you find the density of Al? Fe?) Solubility in water (g/ml) (how well it dissolves in water) Intensive Properties: sample size DOES NOT matter

Other physical properties like volume and mass depend on sample size Extensive Properties: sample size matters

Chemical Properties Describe how matter behaves in presence of other matter Describe how matter changes into another kind of matter –Flammable –Corrosive –Ability to neutralize acids or bases

Physical or Chemical? Reddish brown Forms new substances with HNO 3 MP = 1085  C Density = 8.92 g/cm 3 Reacts to form green copper carbonate Shiny Malleable BP = 2570  C - physical - chemical

Matter goes through changes

Changes Physical – identity remains the same Chemical – identity of matter changes

Physical Change identityThe form or appearance of sample may change but identity remains same –Cutting, crushing, grinding, tearing

Dissolving is physical change Think of sugar in water still have sugar – you just spread it out with water molecules in between C 6 H 12 O 6 (s)  C 6 H 12 O 6 (aq) Aq = dissolved in water

Phase changes are physical changes No new substance is created (chemical formula stays the same) Ex: ice melting: H 2 O(s)  H 2 O(l) water boiling: H 2 O (l)  H 2 O(g)

Chemical Change chemical change - identity of matter is changed new substance with unique properties is formed The chemical formula changes Ex: 2H 2 O(l)  2H 2 (g) + O 2 (g)

Burning oxidation reactionCommon name for oxidation reaction Burning means reacting with oxygen Burning is chemical change, because original substance is changed into new kinds of matter Ex: COMBUSTION CH 4 (g) + 2O 2 (g)  CO 2 (g) + 2H 2 O(g)

Evidence of Chemical a Chemical Change Bubbles (formation of a gas) Color change Heat Light new substance form (if 2 liquids mix and solid is formed, we call this a precipitate(ppt))