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Published byCorey Sharp Modified over 9 years ago
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Chemical Reactions
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In chemical reactions, one or more substances change into different substances. example: combustion
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Word Equations and Chemical Equations Chemists use equations to describe chemical reactions. Word equations show the names of the materials in the chemical reaction. Chemical equations show the chemical formulas of the materials in the chemical reaction. (starting materials)(yields)(ending materials) REACTANT PRODUCTS
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Word equation: sodium + chlorine sodium chloride Chemical equation: Na + Cl NaCl
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Common State Symbols in Chemical Equations State SymbolMeaningExample Solid Liquid Gaseous Aqueous (dissolved in water) (s) (l)(l) (g)(g) ( aq ) (sodium chloride) NaCl (s) (bromine) Br 2(l) (hydrogen) H 2 ( g) (aqueous sodium chloride solution) NaCl (aq)
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Word Equation: sodium chlorinechemical reaction sodium chloride sodium (s) + chlorine (g) sodium chloride (s) Chemical Equation: Na (s) + Cl 2(g) NaCl (s) Let’s go back to the example we used
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zinc (s) + copper(II) sulphate (aq) Word Equation: Chemical Equation: Zn (s) + CuSO 4(aq) zinc sulphate (aq) + copper (s) + energy ZnSO 4(aq) + Cu (s) + energy zinc copper(II) sulphate zinc sulphate copper
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