Chemical reactions

1. Chemical reactions Synthesis. 1

2. Voice-over text • If you put different things together you end up with something different altogether . • 2

3. Concept map A synthesis reaction or direct combination reaction is one of the most common types of chemical reactions. In a synthesis reaction two or more chemical species combine to form a more complex product. Atoms have neutron and • Valency • Electron • Proton • Atoms

4. Dumping ground • In the simplest view of a so-called 'covalent' bond, one or more electrons (often a pair of electrons) are drawn into the space between the two atomic nuclei. Here the negatively charged electrons are attracted to the positive charges of both nuclei, instead of just their own. This overcomes the repulsion between the two positively charged nuclei of the two atoms, and so this overwhelming attraction holds the two nuclei in a fixed configuration of equilibrium, even though they will still vibrate at equilibrium position. In summary, covalent bonding involves sharing of electrons in which the positively charged nuclei of two or more atoms simultaneously attract the negatively charged electrons that are being shared. In a polar covalent bond, one or more electrons are unequally shared between two nuclei.

6. 4

7. H

8. Hy

9. Hyd

10. Hydr

11. Hydro

12. Hydrog

13. Hydroge

14. Hydrogen

15. Hydrogen

16. Hydrogen h

17. Hydrogen hy

18. Hydrogen hyd

19. Hydrogen hydr

20. Hydrogen hydro

21. o hydrogen Hydrogen

22. ox hydrogen Hydrogen

23. oxy hydrogen Hydrogen

24. oxyg hydrogen Hydrogen

25. oxyge hydrogen Hydrogen

26. oxygen hydrogen Hydrogen

27. water • In the end this is water also known as H2o . H2o is 2 hydrogen’s and 1 oxygen’s.