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23 Cards in this Set
- Front
- Back
The earliest particle theory was deveolped by?
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democritus in 400
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Demcritus called natures basic particle the what?
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atom
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The fact the chemical compound contains the same elements in exactly the same proportiond by mass regardless of the size of the sample or source of the coumpound
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law of definite proportions
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if 2 or more drifferent compounds are composed of the same 2 elemnts, then thre ratio of masses of the 2nd elemnt combined with a certain mass of the 1st elemnt in always a ratio of small whole #s
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law of multiple proportions
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mass is neither destryoed nor created during ordinary chemical reactions or physical change
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law of conservation of mass
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all matter is composed of extremely samll partcles called atoms?
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dalton
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atoms of a given elemnt are identicale in size, mass, and other properties?
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dalton
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atoms cannot be subdivied, created, destroyed?
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dalton
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atoms of different elements combined in simple whole# ratios to form chemical compoundas?
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dalton
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in chemical reactions, atoms are combined, seperated, or rearanged?
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dalton
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What are the 2 parts of Dalton's theory that is not correct?
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1. atoms are divisble into smaller particles
2. a given element can ahve atoms wiht different masses |
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the smallest particle of an elemnt that retains the chemical properties of the element
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atom
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What are the parts of the atom?
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nucleous, proton, nuetron, electron, and subtomic particles
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Whose experiment revelaed that the electron has a neg. charge?
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JJ Thomson
1897 (Plum Pudding) |
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Who confirmed that the electron has a neg. chatge?
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Milikin
1909 |
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What was the gold foil experiment?
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Rutherfors, Geiger,& Marsden bobarded a thin, gold foil with fast moving alpha particle.
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short-range, proton-nuetron, proton-proton, and nutron-nitron forces hold the nuclear particles together
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nuclear forces
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the region occupied by the electrons
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electron cloud
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the distance from the center of the nucleous to the outer portion of the electron cloud is
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radious of an atom
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atoms of the same elemnt that have different masses
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isotopes
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the total # of protons and nuetrons in the nucleous of an isotoep
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mass #
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the weighted ave. of the atomic masses of the naturally occurring isotopes of an element
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average atomic mass
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the mass if ine mole of a pure substance
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molar mass
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