Chapter 2 Crossword (2)

3. is an electrically neutral group of two or more atoms held together by chemical bonds
5. below 7 on ph scale
6. chemical bond that involves the sharing of electron pairs between atom
9. the number of protons found in the nucleus of an atom
12. an atom or molecule in which the total number of electrons is not equal to the total number of protons
13. the process of photosynthesis
17. the central and most important part of an object
18. solution in which the solvent is water
19. highly selective catalysts
21. A good example is the reaction between hydrogen and fluorine

1. a process that leads to the transformation of one set of chemical substances to another
2. diatomic anion with chemical formula OH
4. a body of matter
7. chemical substance that neutralise acid and a base
8. A solution in which the maximum amount of solvent has been dissolved
10. something "manufactured" by an enzyme
11. is the amount of work that a thermodynamic system can perform
14. the separation of something from something else
15. minimum amount of energy that is required to activate atoms or molecules
16. a liquid mixture in which the minor component
20. solid,gas,liquid
22. pure chemical substance