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Ch. 2 Notes.rtf

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Department
Chemistry
Course
CHM1311
Professor
A L L
Semester
Spring

Description
ChemistryChapter 2 Notes AtomsAtomic TheoryWhat is Matter Law of conservation of mass Antoine Lavoisier 17431794 Matter is neither created nor destroyed Mass before reactionmass after reactionDaltons Atomic Theory John Dalton 17661844 All matter is made of small indivisible particles called atoms Atoms of the same element are identical in mass and other properties atoms of different elements are different Atoms of different elements combine in simple whole number ratios eg 11 as in AB or 12 as in AB2 Chemical reactions result in separation combination or rearrangement of atoms but do not result in creation or destruction of atomsWhat are Atoms Dalton atoms are small and indivisible ThompsonAtoms contain negatively charged electrons RutherfordAtoms contain a positively charged nucleusScale of Atoms2210 The heaviest atoms has a mass of only 48 x 10 g and a diameter of only 5 x 10 mUseful Units24 1 amu atomic mass unit166054 x 10 g108 1 pm pictometer1 x 10 m100 pm1 x 10 cm Biggest naturally occurring atom is Ca
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