The Progress of Chemical Reactions

3. A biological catalyst, usually a protein, that speeds up specific chemical reactions in living organisms.
7. The substances formed as a result of a chemical reaction, written on the right side of a chemical equation.
8. A high-energy, unstable state during a chemical reaction where old bonds are breaking and new bonds are forming.
9. A substance that increases the rate of a chemical reaction by lowering the activation energy without being consumed.
11. The specific reactant molecule that an enzyme acts upon.
12. A reaction that releases energy (usually heat) into the surroundings; products have less energy than reactants.
13. A theoretical representation of the energy pathway as reactants are transformed into products.
15. The total heat content of a system, often measured as the change in heat during a reaction.

1. The minimum amount of energy required to initiate a chemical reaction.
2. The starting substances in a chemical reaction, written on the left side of a chemical equation.
4. A reaction that occurs through a series of simpler steps known as elementary steps.
5. A reaction that absorbs energy from the surroundings; products have more energy than reactants.
6. The specific region on an enzyme where the substrate binds and the reaction takes place.
10. A reaction that occurs in a single event; reactants convert directly to products without intermediates.
14. A process in which a protein or enzyme loses its shape (and function) due to external stress like high heat or pH changes.