1. I. Bonding A.Compounds consist of atoms of two or more elements that are joined by chemical bonds B. Types of Bonds 1. A covalent bond is formed when two atoms share electrons.

9. Chapter 2

12. 2. An ionic bond is formed when one atom gives up an electron to another. The positive ion is then attracted to a negative ion to form the ionic bond.

16. Remember….. Chemical Reaction 1. reactant + reactant  products before changeafter change

18. Bell work Explain how a covalent bond is formed and then explain how an ionic bond is formed.

20. B. Law of Conservation of Mass MASS IS NEVER CREATED OR DESTROYED! 1.Balancing chemical equations helps the # of reactant atoms = # of product atoms. (Reactions keep all the atoms and rearrange them!)

21. How do you count atoms? CO₂ = 1 carbon and 2 oxygen atoms 2CO ₂ = 2 Carbon and 4 oxygen atoms Ca(OH) ₂= I calcium, two oxygen, and two hydrogen atoms 2Ca(OH) ₂= 2 calcium, 4 oxygen, and 4 hydrogen atoms

22. How about this hard one! 3 Al ₂(CO₃) ₃ – How many Aluminum? 3 x 2 = 6 aluminum atoms -How many carbon atoms 3 x1 x 3 = 9 carbon atoms -How many oxygen atoms? 3 x3 x3 = 27 oxygen atoms

23. Now that you can count the atoms are they even on both sides of the reaction? _____ H₂ +_____ O ₂  _____ H ₂O

24. b. 3O ₂  ___O₃

25. c. ____ NO(g)  ____ N₂O(g) + ____NO ₂

26. K+

27. NO -3

28. A carbon gives away an electron

29. Oxygen gains an electron

30. O-2 gains two electrons