LECTURE2

LECTURE2 - Compounds Chapter 2 1 Types of Matter...

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1 Compounds Chapter 2
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2 Types of Matter ± Homogeneous matter has the same appearance, composition, and properties throughout. ± Heterogeneous matter has visibly different phases which can be seen, or properties that vary through the substance.
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3 Classification of Matter
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4 Classification of Matter ± A mixture is two or more pure substances that can be separated by physical changes or method. ± Pure substances have a distinct set of physical and chemical properties and cannot be separated by physical changes.
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5 Pure Substance ± A compound is a pure substance that can be decomposed by a chemical change or method into two or more elements. Two or more elements together. ± An element is a pure substance with its own set of physical and chemical properties that cannot be decomposed into simpler substances. Simplest form of matter. (Chapter One)
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6 Classify ± Water ± Aluminum foil ± Air ± Oxygen ± Cake
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What is in your coffee? 7 Why do we drink coffee? How does it work? The active ingredient caffeine interferes with biochemical reactions in the body.
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How does coffee work? 8 The activity releases adrenaline; which activates the release of dopamine
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9 Why do Atoms Combine? ± To mimic or acquire the stability of the noble gases. ± Stability is due to number of valence electrons noble gases contain. ± Atoms of elements will accept or give away electrons to become more stable.
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10 Reactivity of Elements ± What will elements do to have the same number of electrons as the noble gases? ± What will Sodium do? Na Æ Na + + e - (b) (c) 11p + 11 e- + 10 e-
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11 Reactivity of Elements ± What will potassium do? ² In general: ± 1A Æ 1A +1 + 1e - 19 p + 19 e - Potassium Atom -1e - Cation 19 p + Potassium Ion (K + ) Argon has 18 e - 18 e -
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12 Formation of Ions ± What about Magnesium? ± What’s the closest noble gas to magnesium? ± 2A Æ 2A +2 + 2e - 12 p + 12 e - Magnesium Atom -2e - 12 p + 10 e - Magnesium Ion (Mg +2 ) Cation Neon has 10 e -
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13 Where do the electrons go? ± Must find an element that might need some extra electrons. ± What will bromine do? Who’s the closest noble gas? ± 7A + 1e - Æ 7A -1 35 p + 35 e - Bromine Atom + 1e - 35 p + 36 e - Bromine Ion (Br - ) Anion Krypton has 36 e -
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14 Formation of Monatomic Ions Group 1A-3A Metals Group 5A-7A Nonmetals Na Na + + 1 e - N + 3 e - N 3- Ca Ca 2+ + 2 e - S + 2 e - S 2- Al Al 3+ + 3 e - F + e - F - Cations
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This note was uploaded on 09/16/2011 for the course CHM 1033 taught by Professor Staff during the Spring '08 term at FIU.

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LECTURE2 - Compounds Chapter 2 1 Types of Matter...

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