Chemical Energetics

2. The process of releasing energy when atoms form new chemical bonds (exothermic).
8. The substances formed after a chemical reaction has taken place.
12. The starting substances in a chemical reaction that undergo change.
13. Chemical bonds that require less energy to break, such as Van der Waals forces in gases.
15. The minimum energy required for reactants to collide and start a reaction.
17. A process where reactants rearrange their atoms to form new products with different properties.
18. The movement of thermal energy from a hotter region to a cooler one during a reaction.
19. The energy change when one mole of a compound is formed from its elements.
20. The process where a system takes in energy from its surroundings (as in endothermic reactions).

1. A chemical reaction where a substance reacts with oxygen, releasing heat and light.
3. The study of heat changes in chemical reactions.
4. A reaction that releases heat energy into the surroundings, making them warmer (ΔH is negative).
5. The amount of energy required to break one mole of a chemical bond in a gaseous state.
6. A reaction that absorbs heat energy from the surroundings, making them colder (ΔH is positive).
7. A diagram that shows the energy changes during the course of a reaction, including activation energy.
9. A graphical representation showing how energy changes throughout a chemical reaction.
10. Chemical bonds that require a large amount of energy to break, such as covalent bonds in diamond.
11. The overall heat energy change in a chemical reaction, represented by ΔH.
14. The process where a system gives off energy to its surroundings (as in exothermic reactions).
16. The process of absorbing energy to separate atoms in a molecule (endothermic).