Chemical Reactions and Equations Worksheet

CHM-101L Chemical Reactions and Equations

Balancing & Types of Reactions:

After watching “Types of Chemical Reactions” and completing “Chem Mathematics: Balancing Chemical Equations,” located in topic materials, complete the following questions:

  1. Describe how a chemical equation is written. Where are the reactants found? What about the products? What separates the two halves of the reaction?

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  1. Describe in your own words what happens in each of the five main types of chemical reactions. Give one example of a chemical reaction from each category (examples of reactions must be different from those shown in the video).

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  1. Balance the equations and identify the type of each reaction as: combination decomposition, single replacement, double replacement, or combustion.
    1. # Al (NO3)3 + # (NH4)3PO4 → # AlPO4 + # NH4NO3 Choose an item.
    2. # C2H4O2 + # O2 → # CO2 + # H2O Choose an item.
    3. # Ca + # CuF2 → # CaF2 + # Cu Choose an item.
    4. # H2SO4 + # B(OH)3 → # B2(SO4)3 + # H2O Choose an item.
    5. # S8 + # O2 → # SO2 Choose an item.
    6. # H2O2 → # O2 + # H2O Choose an item.

Synthesis of Aspirin:

Watch “Acetylsalicylic acid (Synthesis),” located in topic materials, in which aspirin (acetylsalicylic acid) will be produced from a reaction between salicylic acid and acetic anhydride. As you watch the video, record the amounts of salicylic acid and acetic anhydride that were used in the experiment.

  1. Amounts of Salicylic acid: Click or tap here to enter text.
  2. Amount of Acetic Anhydride: Click or tap here to enter text.
  3. Given the initial amounts of salicylic acid and acetic anhydride used, calculate the theoretical yield of acetylsalicylic acid that could be produced from this reaction.

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  1. Which of the two reactants, salicylic acid or acetic anhydride, is the limiting reagent? Explain how you know this.

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  1. What is the difference between theoretical yield and actual chemical yield, and how they are determined?

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  1. Compared to the final amount of acetylsalicylic acid (aspirin) that was made in the video, would you consider this reaction to have been successful?

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  1. How does the stoichiometric math process used to determine theoretical yield relate to the conversion factor math that was done in the previous topic?

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  1. How can modern synthesis methods improve the percent yield and the purity of the substance that is obtained?

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  1. In drug synthesis, what does the term “semisynthesis” mean? Do the substances produced by semisynthesis have an advantage over medications that come strictly from natural sources?

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