In the reaction for an exothermic reaction, the overall change is negative. You can tell this because the products have less energy than the reactants, and the arrow showing the overall change in ...

A reaction profile includes the activation energy ... in energy in a reaction is the difference between the energy of the reactants and products. In the profile for an exothermic reaction ...

Enzymes lower the activation energy necessary to transform a reactant into a product. On the left is a reaction that is not catalyzed by an enzyme (red), and on the right is one that is (green).

Hydrogen-based technologies are becoming more of a topic as renewable and clean energy sources are desired. A controversial ...

Rather than burning all their energy in one large reaction, cells release the energy ... so various intermediate products result. For example, when oxygen levels are low, skeletal muscle cells ...

A chemical reaction that's vital to a range of commercial and industrial goods may soon be initiated more effectively and less expensively.