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BIOL 2299 (6)
Chapter 3

Chapter 3.docx

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Department
Biology
Course Code
BIOL 2299
Professor
Gail Begley

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Jonathan Olson Chapter 3 22 September 2013 3.1 Chemical Reactions and Earth’s Early Atmosphere • Combination reaction – when two or more substances combine to form one product o Balanced o Conservation of atoms o Conservation of mass – the sum of the masses of the reactants always equals that of the products • (aq) – aqueous solution; the substance is dissolved in water 3.2 The Mole • Mole (mol) – the SI base unit for expressing quantities of substances • The same number of particles as the number of carbon atoms in exactly 12g of the isotope carbon­12 • 6.022×10 23   • Avogadro’s number (N )A • The atomic mass expressed in the periodic table is that of one mole of that element o Expressed as atomic mass unit (amu) or in daltons (Da) • Molar mass – the mass in grams of 1 mole of any substance •
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