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Balancing Equations - Balancing Equations Practice Dr...

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Balancing Equations Practice Dr. McAdams
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Symbols for Chemical Equations +: Separates one substance from another : Reacts to form products Δ: The reactants are heated. ( s ): Solid ( l ): Liquid ( g ): Gas ( aq ): Aqueous
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Balancing Chemical Equations 1. Use correct chemical formula: C 2 H 6 ( g ) + O 2 ( g ) CO 2 ( g ) + H 2 O( g ) 2. Is Equation Balanced? No 2. Balance one element at a time. Start with element in as few things as possible (try carbon) C 2 H 6 ( g ) + O 2 ( g ) CO 2 ( g ) + H 2 O( g ) 2 C 2 H 6 ( g ) + 7 O 2 ( g ) 4 CO 2 ( g ) + 6 H 2 O( g ) 4. Double check to see if balanced. 2 3 7/2
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Reaction Word Problems Write a balanced reaction for certain types of reactions based only on their word descriptions: Combustion: Butane gas, C 4 H 10 , burns completely in air to give carbon dioxide and water. Write the balanced equation for this reaction: C 4 H 10 ( g ) + O 2 ( g ) CO 2 ( g ) + H 2 O( g ) 2 C 4 H 10 ( g ) + 13 O 2 ( g ) 8 CO 2 ( g ) + 10 H 2 O( g ) 4 5 13/2 + 5 = 13 8
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Reaction Word Problems Combustion: Pentane, C 5 H 12 , burns completely in air to give carbon dioxide and water. Write the balanced equation for this reaction: C 5 H 12 ( l ) + O 2 ( g ) CO 2 ( g ) + H 2 O( g ) Combustion: Ethanol, C 2 H 6 O, burns completely in air to give carbon dioxide and water. Write the balanced equation for this
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