biochem crossword

2. the outermost shell of an atom
4. A substances added to a reaction that doesn’t react but instead helps speed up the rate of reaction
6. when a single compound breaks down into two or more elements
8. center of the cell
9. when + charged ions bond with - charged ions
11. an electron located on the outermost shell
13. a positive charged particle in an atom
14. a reaction that requires energy in order to break bonds
19. the energy required to get a reaction started
20. the production of chemical compounds by reaction from simpler material

1. a negative charged particle in an atom
3. outermost shell of the atom
5. a negatively charged ion
7. a particle with the same mass a a proton with no electric charge
10. __SiO2 + __ HF → __ SiF4 + __ H2O
12. the measure of moles
15. shares atoms equally
16. a reaction that releases energy as bonds form
17. a positively charged ion
18. rapid chemical combination of a substance with oxygen, involving the production of heat and light.