8.23.04 - Law of conservation of mass mass is neither...

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Law of conservation of mass - mass is neither created nor destroyed in a chemical reaction. Constant composition- elements of pure substances are present in definite proportions by mass. (ex. ALL water is 11% hydrogen and Dalton’s Atomic Theory- The smallest unit of an element is an atom Atoms come together to form molecules (ex. Carbon is an element. C 60 and CO2 are molecules. Atoms are not changed in chemical reactions they simply re-arrange. Compounds are molecules made up of different elements. Avogadro’s Law - equal volumes of gases (at the same Temp and Pressure) contain an equal number of molecules. (The gas molecules all take up the same amount of space!) 2 L of H gas+ 1 L of O gas= 2 L of water vapor, this can only be explained if hydrogen and oxygen exist as diatomic molecules. 2 H 2 + 1 O 2 = 2H 2 0 Some element exiset as molecules. . Hydrogen was the lightest atom so it was assigned a mass of 1. Given the correct formula for the formation of water 4 hydrogens in 1g for every 2
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8.23.04 - Law of conservation of mass mass is neither...

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