Answer:
The correct answers are:
1) activation energy
2) reactants
3) activated complex
4) products
Explanation:
The activation energy is the energy required for the reactants to undergo a chemical reaction and become products. Since energy is the y-axis in the diagram shown, we know that the activation energy should be represented by a vertical change. Activation energy is thus paired with number 1, which is the energy difference between the reactants and the activated complex.
The reactants are the starting material of a chemical reaction. They are present before the reaction begins; this means they should have a low x value, since the x axis is the reaction progress (time). The reactants are matched with number 2 on the diagram.
The activated complex, which can also be referred to as the transition state, represents the time when the molecules have their highest energy during a reaction. The activated complex should thus be the highest y-value, and the activation energy is required to produce this state. The activated complex corresponds to number 3.
Finally, the products are the end materials of a reaction and are present after the reaction has concluded. It is important to note that depending on the specific reaction, the products can have either more or less energy than the reactants (although products with more energy are depicted in this diagram). The products are present after the reaction has completed, and are thus located at the far right of the diagram. The products are matched with number 4.
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