CH 3, Chemical Equation Symbols, Types, Percent Composition, Percent Yield

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4 Terms

1
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What do the following mean when writing a chemical equation?

  • (g)

  • (l)

  • (s)

  • (aq)

  • (Δ)

  • (g) = gas

  • (l) = liquid

  • (s) = solid

  • (aq) = dissolved in aqueous (water) solution

  • (Δ) = heat needed for reaction.

2
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Identify:

  • Combination

  • Decomposition

  • Combustion

  • Combination: (synthesis): adding two substances to form a product

  • Decomposition: breaking down a substance into two or more substances

  • Combustion: hydrocarbon + oxygen → carbon dioxide + water

    • NOTE: if regular combustion & not hydrocarbon combustion, it is simply: oxygen + element → oxide

3
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Percent composition formula:

(# atoms) (atomic mass)
———————————- x 100

full weight of the compound

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Percent Yield Formula

(Actual Yield / Theoretical Yield) x 100%