Chapter 2 Lecture

Chapter 2 Lecture - Chapter 2 Atoms Ions and the Periodic...

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Atoms, Ions, and the Periodic Table Chapter 2
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Questions for consideration 1. What evidence suggests that matter is composed of atoms? 2. How does the composition of different atoms differ? 3. How do ions differ from the atoms of an element? 4. How can we describe the mass of the atoms of an element?
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Math tools used 1. Scientific notation 2. Significant figures
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The total mass of substances does not change during a chemical reaction. reactant 1 + reactant 2 product total mass total mass = calcium oxide + carbon dioxide calcium carbonate CaO + CO 2 CaCO 3 56.08g + 44.00g 100.08g Law of Mass Conservation:
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Conservation of mass animation
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No matter the source, a particular compound is composed of the same elements in the same parts (fractions) by mass. Calcium carbonate Analysis by Mass (grams/20.0g) Mass Fraction (parts/1.00 part) Percent by Mass (parts/100 parts) 8.0 g calcium 2.4 g carbon 9.6 g oxygen 20.0 g 40% calcium 12% carbon 48% oxygen 100% by mass 0.40 calcium 0.12 carbon 0.48 oxygen 1.00 part by mass Law of Definite Proportions:
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Calculating the Mass of an Element in a Compound PROBLEM: Analysis shows that 84.2 g of pitchblende contains 71.4 g of uranium, with oxygen as the only other element. How many metric tons (t) of oxygen are combined in a sample of pitchblende that contains 2.3 t uranium?
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This note was uploaded on 07/06/2009 for the course CHEM 1021 taught by Professor Hoenigman, during the Spring '07 term at Colorado.

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Chapter 2 Lecture - Chapter 2 Atoms Ions and the Periodic...

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