Chemical Reactions intro - Chemical Reactions Chemical Equations A chemical equation represents with symbols and formulas the identities and relative

Chemical Reactions intro - Chemical Reactions Chemical...

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Chemical Reactions
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Chemical Equations A chemical equation represents, with symbols and formulas, the identities and relative amounts of the reactants and products in a chemical reaction
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Indications of a Chemical Reaction Evolution of heat and light
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Indications of a Chemical Reaction Formation of new substance Change in color
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Indications of a Chemical Reaction Production of gas
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Law of conservation of mass Nothing can be created or destroyed – just rearranged
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Chemical equations Represent the reactants and products of a chemical reaction by their symbols or formulas Equations must contain correct formulas Elements that normally exist as diatomic molecules Hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine iodine
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1 +1 H 1.008 3 +1 Li 6.941 11 +1 Na 22.99 19 +1 K 39.10 37 +1 Rb 85.47 55 +1 Cs 132.9 87 +1 Fr 223.0 4 +2 Be 9.012 12 +2 Mg 24.31 20 +2 Ca 40.08 38 +2 Sr 87.62 56 +2 Ba 137.3 88 +2 Ra 226.0 21 +3 Sc 44.96 39 +3 Y 88.91 71 Lu 174.9 103 Lr 260.1 22 Ti 47.88 +4 +3 +2 23 V 50.94 +5 +4 +3 +2 24 Cr 52.00 +6 +5 +4 +3 +2 25 Mn 54.94 +7 +6 +4 +3 +2 26 Fe 55.85 +3 +2 27 Co 58.93 +3 +2 28 Ni 58.71 +3 +2 29 Cu 63.55 +2 +1 30 +2 Zn 65.38 40 +4 Zr 91.22 41 Nb 92.91 +5 +4 42 Mo 95.94 +6 +4 +3 43 Tc (97) +7 44 Ru 101.1 +8 +6 +4 +3 45 Rh 102.9 +4 +3 +2 46 Pd 106.4 +4 +2 47 +1 Ag 107.9 72 +4 Hf 178.5 73 +5 Ta 181.0 76 Os 190.2 75 Re 186.2 74 W 183.9 +7 +6 +4 77 Ir 192.2 +8 +4 +4 +3 78 Pt 195.1 +4 +2 79 Au 197.0 80 Hg 200.6 +3 +1 31 +3 Ga 69.72 13 +3 Al 26.98 5 +3 B 10.81 49 +3 In 114.8 81 Tl 204.4 +3 +1 32 Ge 72.59 +4 +2 50 Sn 118.7 +4 +2 82 Pb 207.2 +4 +2 14 -4 Si 28.09 6 -4 C 12.01 33 -3 As 74.92 51 Sb 121.8 +5 +3 83 Bi 209.0 +5 +3 15 -3 P 30.97 7 -3 N 14.00 34 -2 Se 78.96 16 -2 S 32.06 8 -2 O 16.00 52 -2 Te 127.6 84 Po 209.0 +4 +2 9 -1 F 19.00 17 -1 Cl 35.45 35 -1 Br 79.91 53 -1 I 126.9 85 -1
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