Anything that has mass and occupies space
description
Transcript of Anything that has mass and occupies space
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))