CHE 2A Lecture Notes - Lecture 2: Atom, Franciscus Mercurius Van Helmont, Stoichiometry
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CHE 2A Full Course Notes
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Chemistry 2a lecture 2 notes atomic structure and ratio stoichiometry. October 3rd, 2017, professor o. gulacar, uc davis, Q1) [think] johann baptista van helmont (1579-1644) measured the weight of a willow and the soil. Later when the willow grew the tree gained 75kg and the soil lost much less match. He said the gain in weight is purely water. Is he right: not quite a willow is a plant, with water and carbon dioxide in the air by means of photosynthesis the plant gains weight. Note: 9g h2o = 1g h + 8g o (because oxygen is a heavier element) Q2) [math] in mgo sample = 16. 89g mg + 11. 11g o. How much oxygen is present in a sample with 2g of mg: 1. 32g (ratio never changes for one the same compound/molecule) Law that explains of conservation of mass and low definite proportions. (4 points to remember, check slides)
