Chemical energetics
70 past-paper questions on Chemical energetics · examined 2023–2025.
20258 questions
Three statements about a hydrogen–oxygen fuel cell are listed. Which statements are correct?
Which reaction pathway diagram represents an endothermic reaction?
Hydrogen–oxygen fuel cells can be used to power vehicles. Which statement about hydrogen–oxygen fuel cells is correct?
A reaction pathway diagram is shown. Which row identifies the type of reaction and how the temperature of the surroundings changes during the reaction?
The average bond energy for the C–H bond is 413 kJ / mol. What is the enthalpy change when 1.0 mol of methane molecules is formed from carbon and hydrogen atoms?
Use Fig. 8.1 to deduce the time taken for the reaction to finish.
The reaction is repeated using larger pieces of magnesium of the same total mass. All other conditions stay the same. State the effect, if any, on the time taken for the reaction to finish.
The reaction is repeated using larger pieces of magnesium of the same total mass. All other conditions stay the same. State the effect, if any, on the total volume of H2 produced when the reaction is complete.
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