Crossword !

3. Any substance that undergoes a chemical change in a given reaction.
5. Any of various proteins, as pepsin, originating from living cells and capable of producing certain chemical changes in organic substances by catalytic action, as in digestion.
8. The molecular force of attraction in the area of contact between unlike bodies that acts to hold them together.
10. Noting or pertaining to a chemical change that is accompanied by a liberation of heat
12. Occur when a substance combines with another to form a new substance.
14. The nucleus of a hydrogen atom separated from its accompanying electron.
15. A measure of the acidity or alkalinity of a solution.

1. The molecular force between particles within a body or substance that acts to unite them
2. A substance that dissolves another to form a solution
4. The least amount of energy required to activate atoms or molecules to a state in which they can undergo a chemical reaction.
6. The process by which a gas, liquid, or solid is dispersed homogeneously in a gas, liquid, or solid without chemical change.
7. Negatively charged molecule made up of one oxygen bonded to one hydrogen
9. A type of chemical bond in which a hydrogen atom that has a covalent link with one of the electronegative atoms (F, N, O) forms an electrostatic link with another electronegative atom in the same or another molecule.
11. Composed of different substances or the same substance in different phases, as solid ice and liquid water.
13. Something that has a pH value of less than 7