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Chemistry of fuels and energy Knowledge-Based Practice

Chemistry · Applied Chemistry · Chemistry · Environmental & Green Chemistry

5 Chemistry practice questions on Chemistry of fuels and energy. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    In the chemistry of spark-ignition transportation fuels, which pure hydrocarbon is defined as the primary reference standard with an assigned octane rating of 100?

    • A) n-Heptane
    • B) 2,2,4-Trimethylpentane
    • C) n-Octane
    • D) Cyclohexane
  2. 2.

    Which statement correctly defines the primary thermodynamic distinction between the higher heating value (HHV) and the lower heating value (LHV) of a combustion fuel?

    • A) The higher heating value accounts for the total thermal energy released when sulfur and nitrogen impurities oxidize, whereas the lower heating value considers only carbon oxidation.
    • B) The higher heating value represents the heat of reaction measured at constant pressure, whereas the lower heating value represents the heat measured at constant volume.
    • C) The higher heating value includes the latent heat of vaporization by assuming combustion-derived water condenses to liquid, whereas the lower heating value assumes water remains in the vapor state.
    • D) The higher heating value measures heat output at elevated operating temperatures, whereas the lower heating value measures heat output at standard reference temperature.
  3. 3.

    In an acidic proton-exchange membrane fuel cell (PEMFC) supplied with hydrogen and oxygen, which half-reaction takes place at the anode?

    • A) O2+4H++4e−→2H2O\text{O}_2 + 4\text{H}^+ + 4\text{e}^- \rightarrow 2\text{H}_2\text{O}
    • B) H2→2H++2e−\text{H}_2 \rightarrow 2\text{H}^+ + 2\text{e}^-
    • C) 2H2O→O2+4H++4e−2\text{H}_2\text{O} \rightarrow \text{O}_2 + 4\text{H}^+ + 4\text{e}^-
    • D) O2+2H2O+4e−→4OH−\text{O}_2 + 2\text{H}_2\text{O} + 4\text{e}^- \rightarrow 4\text{OH}^-
  4. 4.

    In the chemistry of alternative fuels, the catalytic conversion of synthesis gas (a mixture of carbon monoxide and hydrogen) into liquid hydrocarbons is a central method for manufacturing synthetic transportation fuels. Which chemical process accomplishes this transformation?

    • A) Haber-Bosch process
    • B) Ostwald process
    • C) Claus process
    • D) Fischer-Tropsch process
  5. 5.

    In green chemistry, biodiesel is commonly synthesized through the base-catalyzed transesterification of triglycerides using methanol. Which pair represents the desired fuel product and the major stoichiometric co-product of this reaction?

    • A) Triacylglycerols and propane
    • B) Free fatty acids and ethylene glycol
    • C) Short-chain alkanes and methanol
    • D) Fatty acid methyl esters and glycerol

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