shiloh wanted to observe the changes that occurred during an exothermic reaction. he monitored the changes…

shiloh wanted to observe the changes that occurred during an exothermic reaction. he monitored the changes and placed them in a chart.\n| time | amount of energy added (kj) | reaction |\n| ---- | ---- | ---- |\n| 10:15 a.m. | 430 | reactants remained unchanged |\n| 10:45 a.m. | 530 | reactants formed a gas |\n| 11:15 a.m. | 630 | reactants continued to produce gas |\nwhich statement best describes his data?\no the activation energy was reached at 10:45 a.m. without the additional energy, the reaction would have stopped.\no the activation energy was reached at 11:15 a.m. the previous change was the threshold point for a reaction.\no the activation energy was reached at 10:15 a.m. the additional energy allowed for a lower activity level.\no the activation energy was reached was 10:45 a.m. the additional energy did not affect the reaction.

shiloh wanted to observe the changes that occurred during an exothermic reaction. he monitored the changes and placed them in a chart.\n| time | amount of energy added (kj) | reaction |\n| ---- | ---- | ---- |\n| 10:15 a.m. | 430 | reactants remained unchanged |\n| 10:45 a.m. | 530 | reactants formed a gas |\n| 11:15 a.m. | 630 | reactants continued to produce gas |\nwhich statement best describes his data?\no the activation energy was reached at 10:45 a.m. without the additional energy, the reaction would have stopped.\no the activation energy was reached at 11:15 a.m. the previous change was the threshold point for a reaction.\no the activation energy was reached at 10:15 a.m. the additional energy allowed for a lower activity level.\no the activation energy was reached was 10:45 a.m. the additional energy did not affect the reaction.

Answer

Brief Explanations:

Activation energy is the minimum energy required to start a chemical reaction. At 10:15 a.m., reactants remained unchanged. At 10:45 a.m., reactants formed a gas, indicating the reaction started, so activation energy was reached then. Additional energy is needed to keep an exothermic reaction going. Without it, the reaction would stop.

Answer:

The activation energy was reached at 10:45 a.m. Without the additional energy, the reaction would have stopped.