Chapter 2

Chapter 2 - CHAPTER 2:- ATOMS, MOLECULES, AND IONS Read...

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CHAPTER 2:- ATOMS, MOLECULES, AND IONS Read sections 2.1/2.2; SKIP LAW OF MULTIPLE PROPORTIONS!!! Know the ‘Law of Conservation of Mass’ (Lavoisier): mass is neither created nor destroyed Gay-Lussac’s Law of Gases: gases react such that their volumes are in whole number ratios 2 volumes H 2 + 1 volume O 2 = 2 volumes gaseous water (2H 2 O + O 2 = 2H 2 O) 1 volume H 2 + 1 volume Cl 2 = 2 volumes HCl (H 2 + Cl 2 = 2HCl) Avogadro’s Hypothesis: at the same temperature and pressure, equal volumes of different gases contain the same number of particles (basically, the same thing as Gay-Lussac) Importance of his hypothesis: certain gases are diatomic; weight ratios of gas molecules can be measured John Dalton proposes basic atomic principles still accepted today, first table of atomic masses; amu = Dalton (unit of measurement) 9g H 2 O = 1g H + 8g O Dalton Atomic Theory: 1. Elements made up of atoms 2. Atoms of a given element are identical 3. Compounds are formed when atoms of different elements combine with each other
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Chapter 2 - CHAPTER 2:- ATOMS, MOLECULES, AND IONS Read...

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