CH100 S10 c2 - Chapter 2 Problems Matter and Energy...

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Chapter 2 Matter and Energy CH100 Fall 2010 Problems 5,9,11,15,17,37,39,41 2.1 Models and Matter Matter has a defined mass and volume. Matter consists of atoms, molecules or ions. For example, 100 g of ice occupies 110 cm 3 , and consists of 3.3 x 10 24 H 2 O molecules. Three Size Ranges of Matter: Macroscopic: the visible world Microscopic: living cells, crystals Particulate: atoms and molecules One cannot routinely view particulate matter; particulate matter must be visualized by other means. Models and symbols represent particulate matter.
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2.1 Models and Matter-2 Atoms are composed of 3 subatomic particles : Particle Charge Mass proton +1 1.67x10 -24 g neutron 0 1.67x10 -24 g electron -1 9.11x10 -28 g Properties of Atoms: Atoms consist of a compact nucleus, containing the protons and neutrons, surrounded by an electron cloud. Atoms are electrically neutral (same # of protons and electrons) Atoms may gain or lose electrons to form ions.
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2.1 Models and Matter-3 Atoms are represented by Chemical Symbols . Chemical symbols are either 1 or 2 letters; the first is upper case, second (possible) is lower case. Atoms: H O C He Na Au Molecules are atoms which are bonded together. A line(s) between atoms represent a chemical bond. Symbols are combined to make molecular formulas. Subscripts indicate the number of each type of atoms in the molecule: H 2 = H-H H 2 O = H-O-H O 2 = O-O H 2 O 2 = H-O-O-H Atoms and Molecules may be represented by models , such as sticks, balls and sticks, or spheres
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2.2 States of Matter: Solids, Liquids, and Gases Different states of matter are characterized by the motions and interactions of the particles. Gases:
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This note was uploaded on 03/29/2011 for the course CHEM 100 taught by Professor Jablonsky during the Spring '11 term at University of Alabama at Birmingham.

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CH100 S10 c2 - Chapter 2 Problems Matter and Energy...

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