Question Video: Reading the Relative Energy of Labeled Items on an Energy Diagram | Nagwa Question Video: Reading the Relative Energy of Labeled Items on an Energy Diagram | Nagwa

Question Video: Reading the Relative Energy of Labeled Items on an Energy Diagram Chemistry • First Year of Secondary School

Labeled in the diagram are the chemical energies of three compounds, a-c. Which of the labeled compounds is highest in energy? Which of the labeled compounds is lowest in energy? Which of the labeled compounds is most stable? Which of the labeled compounds is least stable?

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Video Transcript

Labeled in the diagram are the chemical energies of three compounds, a through c. Which of the labeled compounds is highest in energy? Which of the labeled compounds is lowest in energy? Which of the labeled compounds is most stable? Which of the labeled compounds is least stable?

Based on the diagram included in the question, this question is asking us to look at the energy and stability of the three compounds. The axis of the diagram indicates that the energy increases as we move up from low energy at the bottom to high energy at the top. With this understanding in mind, we can see that the labeled compound with the highest energy is b, the one furthest up in the diagram, while the one with the lowest energy is a, the one furthest down in the diagram.

The third and fourth questions ask us to find the most and least stable of the three choices. Stability is not directly indicated by the diagram. But if we know the relationship between energy and stability, we can answer this question. In fact, energy and stability are inversely related. Particles with more energy are more likely to move and change, making them less stable. Particles without a lot of energy don’t move around as much, making them more likely to stay the way they are or making them highly stable. So, the choice with the highest energy, compound b, is also the choice that is the least stable. Conversely, the choice with the lowest energy, compound a, is also the choice that is the most stable.

To summarize our answers, we can say that the compound with the highest energy is compound b. The compound with the lowest energy is compound a. The compound that is the most stable is also compound a. And the compound that is the least stable is compound b.

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