Lesson2powerpoint - Some Important Points to Note about...

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Some Important Points to Note about CHEM 102B Homework on Assignments handout means Online Homework (Lon Capa) Homework 1 due Tuesday, Jan 25, 9a.m. Problems listed on Assignments handouts from text must be done because some of these problems will reappear on your quizzes. Chemistry is NOT a spectator subject; the more problems you attempt; the better grade you will get! Worksheets on course worksheet must be completed before attending the discussion so you can get assistance with any problems you do not understand at the discussion section. Some of the worksheet problems will also reappear on quizzes.
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ATOMS, MOLECULES AND IONS
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Atoms Atoms are the building blocks of matter. Understanding the structure and properties of atoms is critical as combinations of atoms lead to the formation of unlimited number of chemical compounds, some of which are essential for life.
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Dalton’s Atomic Theory 1. Matter is composed of indivisible atoms. 2. All atoms of a given chemical element have identical properties. 3. Different chemical elements are composed of different atoms of different masses. 4. Atoms are indestructible and chemical reactions are a rearrangement of atoms. 5. A compound forms from its elements through the combination of atoms of unlike elements in small whole number ratios. John Dalton
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1. Matter is composed of indivisible atoms Particle Symbol Absolute Charge (C) Relative Charge Absolute mass (kg) Electron e- -1.60 x 10 -19 -1 9.11 x 10 -31 Proton p+ 1.60 x 10 -19 +1 1.673 x 10 -27 Neutron n 0 0 0 1.675 x 10 -27 We now know that atom have subatomic particles called electrons, neutrons and protons.
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The nucleus contains nearly all of the mass of the atom, but it occupies only a tiny fraction of the space inside the atom 1. Matter is composed of indivisible atoms Electrons move around the nucleus. This electron “cloud” makes up the
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This note was uploaded on 05/04/2011 for the course CHEM 211 taught by Professor Kelly during the Spring '11 term at University of Illinois at Urbana–Champaign.

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Lesson2powerpoint - Some Important Points to Note about...

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