Reaction Profiles (GCSE Chemistry)

On a reaction profile graph, which vertical distance corresponds to the overall energy change (?H) for the reaction?

When comparing two reaction profiles, the one with the lower activation energy will usually have

Which part of a reaction profile represents the minimum energy barrier that must be overcome for reactants to form products?

A reaction profile shows two peaks for a reaction mechanism with two steps. The highest peak corresponds to

Which change to a reaction profile would show the reaction is endothermic?

How does increasing concentration of reactants affect a reaction as illustrated conceptually (not on the profile shape itself)?

If two reaction profiles show the same activation energy but different overall energy changes, they differ in

Which change to a reaction will be represented on a reaction profile by lowering the peak but keeping reactant and product levels unchanged?

In bond-energy terms, why do exothermic reactions release energy?

When bond energies are: C—H = X, C—C = 347, O=O = 498, C=O = 805, O—H = 464, and the overall reaction energy is -2219 kJ per mole (exothermic), which algebraic procedure finds X?

When bond energies are used to calculate overall energy change, the correct approach is to