chem slide 1 - Chemistry 107: General Chemistry Chemistry...

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Chapter 1 1 Chemistry 107: General Chemistry Chemistry 107: General Chemistry for Engineers for Engineers Prof. Jerry Keister
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Chapter 1 2 Chemistry: Matter and Chemistry: Matter and Measurement Measurement Chapter 1 Chapter 1
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Chapter 1 3 Chemistry: Chemistry: the science that deals with the composition, structure, properties, and transformations of matter.
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Chapter 1 4 The Molecular Perspective of Chemistry The Molecular Perspective of Chemistry Matter is made up of atoms . An atom is comprised of protons (positively charged), neutrons (uncharged), and electrons (negatively charged). Atoms which have the same number of protons (and electrons) are identified as belonging to the same element . Atoms of the various elements combine in definite proportions to form pure substances. Atoms of different elements combine to form compounds .
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Chapter 1 5 Elements Elements There are 117 elements known, each given a unique chemical symbol (one or two letters), the first letter capitalized (e.g., He, Be). The name is NOT capitalized.
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Chapter 1 6 The earth’s crust consists of 5 main elements. The human body consists mostly of 3 main elements (O, C, and H). All elements originated by nuclear fusion of hydrogen in stars.
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Chapter 1 7 The Periodic Table The Periodic Table
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Chapter 1 8 Periodic table – grid of the elements arranged in 7 horizontal rows and 18 vertical columns. Periods – seven horizontal rows in the periodic table. Groups - 18 vertical columns in the periodic table. 1. Groups numbered 1A 8A and 1B 8B (or 1 18). 2. Actually have 32 groups Lanthanides (14 elements after lanthanum) and actinides (14 elements after actinium) are not included in the group numbers .
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Chapter 1 9 General Concepts: Periodic Trends and General Concepts: Periodic Trends and Chemical Reactions Chemical Reactions We divide the Periodic Table into metals, nonmetals and metalloids.
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Chapter 1 10 . Three major classes of elements in the periodic table. 1. Metals - solids (except mercury) which are malleable, ductile (can be drawn into thin wires without breaking), and which conduct heat and electricity 2. Nonmetals - may be gases, liquids or solids, some are brightly colored, some are brittle solids, most are poor conductors of heat and electricity 3. Semimetals (metalloids) - properties fall between metals and nonmetals, brittle, poor conductors of heat and electricity
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Chapter 1 11 The periodic table of the elements is the most important organizing principle of chemistry. Main Group (or Representative) Elements - Groups 1A
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chem slide 1 - Chemistry 107: General Chemistry Chemistry...

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