Lecture 5 Compounds & the Mole

Lecture 5 Compounds & the Mole - Lec-5: Compounds...

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Lec-5: Compounds & the Mole Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 1 Elements of the Solar system Solar Nebula (Gigantic swirling mass of gas) Swirling matter condensed into planetesimals Planets Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 2
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Elements of the solar system The lightest and most volatile elements were swept away from the planets closer to the sun ¾ Solar wind and solar heat Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 3 Early Earth The early earth was a hot molten mass Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 4 The early earth was a hot, molten mass ¾ Its component elements fractionated
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` A compound is obtained by chemically combining Compounds by chemically combining the atoms of two or more elements. ` Chemical equations use Chemical equations use chemical formulas to express the identities and quantities of substances involved in a reaction. The same elements can combine in different ratios to form different compounds 5 Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 Earth’s early compounds ` Carbon Dioxide ` Water Chemical compounds : ¾ have a unique and ` Sulfur Dioxide defined chemical structure ¾ have a fixed ratio of atoms that are held ` Sulfur Trioxide atoms that are held together in a defined spatial arrangement by chemical bonds ` Nitrogen Oxide Elements of a compound do not retain their original ` Nitrogen Dioxide properties and can not be separated by physical methods 6 Roy A. Lacey, Stony Brook University; Che 131, Spring 2011
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Law of multiple proportions If two elements (A and B) combine to form more than one compounds, the masses of one element (A) that combine with a fixed mass of the other element (B) are in the ratio of small whole numbers (or multiples of it).
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Lecture 5 Compounds & the Mole - Lec-5: Compounds...

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