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

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 matterWords:

• color, texture, luster, odor, solid, liquid, gasMeasurements:

• a number and a unit

• A sample of CO2(s) and a sample of CO2(g) different in their 1) chemical composition 2) empirical formula 3) molecular structure 4) physical properties

Other physical properties includeDensity, 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 HNO3

• MP = 1085C• Density = 8.92 g/cm3

• Reacts to form green copper carbonate

• Shiny• Malleable• BP = 2570C

- physical

- physical- physical

- physical- physical

- physical

- chemical

- chemical

Matter goes through changes

Changes

Physical – identity

remains the same

Chemical – identity of

matter changes

Physical Change• The 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

• C6H12O6(s) C6H12O6(aq)Aq = dissolved in water

• Phase changes are physical changes

• No new substance is created (chemical formula stays the same)

• Ex: •ice melting: H2O(s) H2O(l)•water boiling: H2O (l) H2O(g)

Chemical Change•chemical change - identity of

matter is changed•new substance with unique

properties is formed•The chemical formula changes•Ex: 2H2O(l) 2H2(g) + O2(g)

Burning• Common 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 CH4(g) + 2O2(g) CO2(g) +

2H2O(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))