anything that has mass and occupies space
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Anything that has mass and occupies space. - PowerPoint PPT PresentationTRANSCRIPT
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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
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Properties – used to characterize
matter
Physical –how they look
Chemical – how they react with
others
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Physical Properties•Describe the appearance
and form of matterWords:
• color, texture, luster, odor, solid, liquid, gasMeasurements:
• a number and a unit
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• 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
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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
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Other physical properties like volume and mass depend on sample size
Extensive Properties: sample
size matters
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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
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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
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Matter goes through changes
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Changes
Physical – identity
remains the same
Chemical – identity of
matter changes
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Physical Change• The form or appearance of sample
may change but identity remains same– Cutting, crushing, grinding, tearing
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• 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
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• 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)
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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)
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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)
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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))