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18 Cards in this Set
- Front
- Back
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the smallest particle of an element that retains all of its chemical and physical properties
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atom
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Matter is neither created nor destroyed during a chemical change
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law of conservation of mass
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Known as the father of modern chemistry....discovered the law of conservation of mass
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Lavoisier
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a compound always contains certain elements in certain proportions and in no other combinations
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law of definate proportions
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discovered the law of definate proportions...
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Proust
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Dalton's atomic theory
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1. all matter is composed of atoms
2. all atoms of a given element are alike, but atoms of one element differ from the atoms of any other element 3. compounds are formed when atoms of different elements combine in fixed proportions 4. a chemical reaction involves a rearrangement of atoms..none are created destroyed or lost in chemical reaction |
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how many elements on earth occur in nature?
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about 90 occur in nature and two dozen more are sythesized by scientists
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if substance could be broken down into simpler substances is is not an element...idea initiated by?
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Robert Boyle...the sceptical chymist
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This individual wrote what was considered the first chemistry textbook...
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Lavoiser
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states that a compound always contains the same elements in certain definate proportions and no other combinations
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the law of definate proportions
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pure water freezes and boils at what temp?
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freezes at 0c and boils at 100c
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two or more kinds of atoms chemically combined in different proportions
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compound
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created the periodic table arrangement
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Dimitre Ivanovich Mendeler
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periodic table is arranged in order of increasing what? and is grouped by what?
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atomic mass
grouped by shared properties |
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How many elements does the modern periodic table contain?
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114 elements
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a group of atoms chemically bonded or blended together
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molecule
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H2
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hydrogen molecule
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H
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hydrogen atom
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