If a reaction is exothermic, then which of the following statements is always true? if a reaction is exothermic, then which of the following statements is always true? the products have lower potential energy than the reactants. energy must be added for the reaction to proceed. the products have lower entropy (are more ordered) than the reactants. it occurs extremely quickly.

Explanation:

Reactants ⇒ product + heat (exothermic reaction) (1)

We have given that the reaction is exothermic, so the heat is rejected from the reaction. We know that heat is the form of energy.

From equation (1)

from the given equation we can see that reactants have more energy than products.

So the reactants have higher potential energy in comparison to the products.

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.