chapter%202 - HM 5 CHM 25 Chapter 2 Prof. R.S. Miller...

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Unformatted text preview: HM 5 CHM 25 Chapter 2 Prof. R.S. Miller Historical background reeks: Matter composed of air earth fire water Greeks: Matter composed of air, earth, fire, water. Democritus (460-370 BC) Greek philosopher; atomos Next 2000 years, alchemy t t ll 16 th century, metallurgy Boyle (1627-1691) credited as 1 st to carry out chemical rxns measurements challenged the Greek 4 Lavoisier (1743-1794) explained combustion weighed items. 1 st to publish modern chemical textbook Priestley (1733-1804) discovered CO 2 , graphite as conductor, olated oxygen gas by heating mercuric oxide isolated oxygen gas by heating mercuric oxide. Proust (1754-1826) what defines a compound? Lavoisier (1743-1794) explained combustion reactions published 1 st modern chemistry textbook aw of Conservation of aw of Conservation of ass ass tal mass of substances tal mass of substances Law of Conservation of Law of Conservation of Mass Mass total mass of substances total mass of substances present present after after a chemical reaction is the same as the total a chemical reaction is the same as the total mass of substances mass of substances before before the reaction. the reaction. roust 754 826) w of constant composition ll samples of a ass of H (g) ydrogen (g) xygen(g) Proust (1754-1826) law of constant composition all samples of a compound have the same composition the same proportions by mass of the constituent elements. Mass of H 2 O (g) hydrogen (g) oxygen(g) Experiment 1 27.35 3.06 excess (combination reaction) Experiment 2 ? 1.45 11.51 (electrolysis) Results above consistent w/ the law of constant composition?...
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This note was uploaded on 02/22/2011 for the course CHEM 25 taught by Professor X during the Spring '06 term at Lehigh University .

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chapter%202 - HM 5 CHM 25 Chapter 2 Prof. R.S. Miller...

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