1. Elements, Compounds and Chemical Equations (pp 24-31 of Chemical Interactions)

2. Compounds A compound is made when a specific number of atoms of more than one element bond together to make a new substance. Compounds often have different properties than the atoms that make them up. It is very difficult to separate elements once they are in a compound. Can you think of some examples? Water (H 2 O) is a liquid at room temperature, but the two elements that make up water, hydrogen (H) and oxygen (O) are gases at room temperature!

3. 1G1G 2G2G 3G3G The coefficient is the number in FRONT of the element or compound. It tells you the number of molecules you have.

4. 1Na1Na 2Na 3Na In Class Example 1: Sketch the correct number of sodium atoms.

5. Compounds can also have SUBSCRIPTS The subscript number in a compound tells us how many atoms of each element are in 1 molecule of that compound. The subscript number refers to the atoms bonded together. G2G2 G3G3

6. Compounds have formulas that tell us how many atoms of each element are present. C 2 H 3 ClPVC C8H8O3C8H8O3 vanilla NaClsalt

7. HH2OH2O H2H2 2H 2 O 3H 2 4H 2 O In class example 2: A)Draw the atoms. B) Indicate the number of hydrogen atoms in each and the number of oxygen atoms in each. C) Indicate the number of molecules in each.

8. Given the following examples, write the number of molecules of each compound, and the number of atoms of each element 5C 6 H 12 O 6 C 10 H 14 O 2H 2 O8NaCl 4CH 3 COOH8CH 3 Na

9. FIVE RULES FOR BALANCING CHEMICAL EQUATIONS 1.You can ONLY change the COEFFICIENT (NEVER THE SUBSCRIPT!!!!!!!!!!!!!!!!!!!) 2.Balance all elements except hydrogen and oxygen. 3.Balance hydrogen 2 nd to last. 4.Balance oxygen last. 5.Double check to make sure ALL elements are balanced.

10. Do the “BALANCING EQUATIONS SHEET” http://www.youtube.com/watch?v=WCBXXRFVpqY &feature=PlayList&p=0C58BCE416D5C891&index =0&playnext=1

11. Types of Chemical Reactions 4 types: 1)Synthesis 2)Decomposition 3)Single Replacement/Displacement 4)Double Replacement/Displacement The Story of Amy and Bob

12. How to Remember this? The Story of Amy and Bob!

13. Synthesis Reaction A + B  AB You MAKE a new product Examples: 2H 2(g) + O 2(g)  2H 2 O (l)

14. Decomposition Reaction AB  A + B The reactant breaks up! 2NaHCO 3(s)  Na 2 CO 3(s) + H 2 O (g)

15. What really happened with Amy and Bob?

16. Single Replacement Reaction (sometimes called single displacement) AB + C  AC + B

17. Single Replacement Reaction CuO + C  CO 2 + Cu Zn + HCl  H 2 + ZnCl 2 http://www.youtube.com/watch?v=6nEt6c W_GSw http://www.youtube.com/watch?v=oQz5 YEsx7Fo

18. Double Replacement Reaction AB + CD  AC + BD

19. Double Replacement Reaction HCl + NaOH  HOH + NaCl

20. Precipitation Reaction This occurs when a solid is formed from 2 (or more) solutions. Pb(NO 3 ) 2(aq) + 2KI(aq)  PbI 2(s) + 2KNO 3(aq)

21. 5 1 2 3 4 6 7 Label the group number. THIS MEANS the NUMBER OF _________________ Label the period. THIS MEANS the NUMBER OF ___________________