Science, Elements, Compounds, And Mixtures: Ch.3

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Elements

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are pure substance that cannot broken down into simpler substances by physical or chemical means

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Pure substances

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contain only 1 type of particle, atoms.

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properties of elements

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each element can be identified by its unique set of properties= characteristic properties.
Physical: boiling point, melting point,and density
chemical: reactivity with acid

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characteristic properties

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are properties that are true for every sample of that type of matter. They never, ever change

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metals

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are elements that are shiny and aregood conductors of heat and electric current.They are melleable.(they can be hammeredinto thin sheets.) they are also ductile."they can be drawn into thin wires

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nometals

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are elements that are dull and that are poor conductors of heat and electic current. solids tendto be brittle and unmalleable. few familiar objects are made of only nonmetals

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metalloids

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are also called semiconductors. they haveproperties of both metals and nonmetals.some metalloids are somewhatmalleable andductile. some metalloids conduct heat and electric current as well.

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compounds

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is apure substance made up of 2ormore gifferent elements that arechemically combined.(CO2, NaCl,H2O)

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molecule

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formswhen 2 or more atomsjoin together from the same element or different elements.(CO2, NaCl,O2 H3)
all compounds are molecules, but not all molecules are compounds.

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compounds tip 1,2, and 3,4

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compounds can beidentified by their unique properties. each compounds has its own physical and chemical properties that are different from the elements that formed them. combined in a definite ratio. 2 hydrogen atoms+1 oxygen atom==H2O

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componds #5

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componds can be broken down into asimpler form.break down only through chemical change.
add heat== original elements
add electric current= simpler compounds

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compounds #6

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oftencompounds must be broken down to provide elements or simpler compounds that can beused asraw material.

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AL

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aluminum

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C

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Carbon

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H

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Hydrogen

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Na

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sodium

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Ca

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Calcium

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Cl

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Chlorine

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O

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Oxygen

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S

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Sulfer