Question

Shiloh wanted to observe the changes that occurred during an exothermic reaction. He monitored the changes and placed them in a chart.


Which statement best describes his data?

The activation energy was reached at 10:45 a.m. Without the additional energy, the reaction would have stopped.
The activation energy was reached at 11:15 a.m. The previous change was the threshold point for a reaction.
The activation energy was reached at 10:15 a.m. The additional energy allowed for a lower activity level.
The activation energy was reached was 10:45 a.m. The additional energy did not affect the reaction.

Answer 1

The first statement. The activation energy (the minimum input needed to start/keep the reaction going) was reached at 10:45 a.m.; without that extra energy the reaction would not proceed.