Chapter 2 Properties of Matter. 2.1 Properties of Matter 2.1 Classifying Matter.
Atom The “smallest piece” of matter that still keeps all the properties of the element (we will...
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Transcript of Atom The “smallest piece” of matter that still keeps all the properties of the element (we will...
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Atom
The “smallest piece” of matter that The “smallest piece” of matter that still keeps all the properties of the still keeps all the properties of the
elementelement(we will talk about properties later)(we will talk about properties later)
All matter is composed of atomsAll matter is composed of atoms
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AtomHave we ever seen atoms?
Yes – ever since the invention of the scanning tunneling electron microscope in 1981 by Nobel Laureates Gerd Binnig and Heinrich Rohrer
Platinum atoms
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Molecule
Another “smallest piece” of matter – Another “smallest piece” of matter – but are made of two or more atoms.but are made of two or more atoms.
All matter is composed of moleculesAll matter is composed of molecules
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Molecule
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Matter -
Anything that has mass and Anything that has mass and takes up spacetakes up space
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Pure Substance: is either an
ElementElementor aor a
CompoundCompound
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Element-
Has only one kind of atom, Has only one kind of atom, found on the periodic tablefound on the periodic table
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Examples of Elements
Anything on the Anything on the periodicperiodic table table
H He
O Ne
K Ar
N Kr
C Xe
Ca Rn
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Compound -
Substance with two or more Substance with two or more kinds of atoms bound kinds of atoms bound
togethertogether
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Example: Water
The elements hydrogen and The elements hydrogen and oxygen combineoxygen combine
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Example : Salt
The elements sodium and The elements sodium and chloride combine (NaCl)chloride combine (NaCl)
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Mixture – is a impure substance made of two or more
things mixed together
Can be separated by Can be separated by physical means, physical means,
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Homogeneous mixture-
Evenly mixed mixture
Sometimes called a solution
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Examples of solutions
Salt WaterSalt Water
Rubbing AlcoholRubbing Alcohol
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Heterogeneous mixture-
Unevenly mixed mixtureUnevenly mixed mixture
*Different materials can be seen
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Examples:Italian dressing, Concrete, PizzaItalian dressing, Concrete, Pizza
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Colloids-
A A heterogeneous heterogeneous mixture that mixture that never settles never settles and scatters and scatters
lightlight
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Examples: gelatin, whipped cream
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Examples: milk, fog
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Suspension-
A type of mixture in which A type of mixture in which visible particles settlevisible particles settle
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Examples: muddy water,
Italian dressing,
snow globes