What do the peaks on the graphs in figure 7-3 represent

The given graphs are Reaction Coordinate Diagrams which depict the conversion of reactants into products.

Diagram 1: Represents an exothermic reaction. These reactions proceed with the release of heat energy as a result the energy of the products is lower than the reactants.

Diagram 2: Represents an endothermic reaction. In contrast, these reactions proceed with the absorption of heat energy as a result the energy of the products is higher than the reactants.

In both diagrams, there is a peak or a hump which corresponds to the activation energy for the reaction. This is the minimum amount of energy required by the reactants as they collide to form the products.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72

bcde is the incorrect answer it is a