Chemical crossword

3. Neutrally charged subatomic particles found in the nucleus.
6. Substance that decreases activation energy and increases reaction rate in a chemical reaction.
8. Compound that donates a proton (H+) when dissolved in a solution.
12. Substance formed by a chemical reaction.
13. Smallest basic unit of matter.
14. Chemical bond formed when two atoms share one or more pairs of electrons.
16. Compound that accepts a proton (H+) when dissolved in a solution.
19. Chemical reaction that requires a net input of energy.
20. Negatively charged subatomic particles found in shells or clouds around the nucleus.

1. Condition in which reactants and products of a chemical reaction are formed at the same rate.
2. Atom that has gained or lost one or more electrons.
4. Substance that is changed by a chemical reaction.
5. Protein that catalyzes chemical reactions for organisms.
7. Reactant in a chemical reaction upon which an enzyme acts.
9. Form of an element that has the same number of protons but a different number of neutrons as another element.
10. Positively charged subatomic particles found in the nucleus.
11. Substance made of atoms of different elements that are bonded together in a particular ratio.
15. Chemical reaction that yields a net release of energy in the form of heat.
17. Chemical bond formed through the electrical force between oppositely charged ions.
18. Two or more atoms held together by covalent bonds.