A Room Filled with a 2:1 Mixture of Hydrogen and Oxygen

question 10

Multiple Choice

A room filled with a 2:1 mixture of hydrogen and oxygen gases can be safely inhaled.  However, with a single spark, it can react explosively.  Since the explosion would be considered a spontaneous process, what did the spark provide?

• A)endothermic energy
• B)exothermic energy
• C)free energy
• D)activation energy

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