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Science and technology

divers notions de chimie

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R?sum? Chimie: Partie 3-4 La r?activit? des ?l?ments d?pend de 4 facteurs: Le rayon de l?atome L??nergie d?ionisation?: L??nergie que l?on doit fournir ? un atome pour arracher l??lectron le moins li? ? l??tat gazeux et former un cation L??lectroaffinit??: Quantit? d??nergie d?gag?e par la capture d?un ?lectron par un atome ? l??tat gazeux. Plus l??lectroaffinit? est grande, plus la capture d??lectron d?gage de l??nergie et est stable. Si l?affinit? ?lectronique est n?gative, il faut fournir de l??nergie ? cet atome pour lui attacher un ?lectron L??lectron?gativit??: Mesure de la capacit? d?un ?l?ment ? tirer les ?lectrons vers lui dans une liaison covalente.

AP Euro Scientific Revolution and Natural Philosophers and Europe 1686 - 1740

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Chapter 14 Scientific Revolution - ?Natural philosophers? - Process that established new view of universe - Changes EVERYTHING - Defining characteristic of modern Western civilization - Astronomy - A) Copernicus (1493-1543) - ?On the revolutions of the heavenly spheres? 1543 - Prior thought - geocentric - Ptolemy and Aristotle - Earth centered - Heavens ? planets ? sun + moon ? earth - Heliocentric - Sun centered - No new evidence - B) Tycho Brahe (1546-1601) - Body of astronomical data - Moon + sun around earth - other planets around sun - C) Kepler (1571-1630) - Combine Copernicus + Brah?s data - Conclude - sun centered universe - Elliptical orbit (not circular) - No explanation as to why - D) Galileo (1564-1642) - Telescope
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