1. ENTRY QUIZ LecturePLUS Timberlake1 1.How many elements do you know? 2.What are they? 3.Which of them are inert gases? 4.Which are metals? 5.Which are metalloids?

2. 11 th element LecturePLUS Timberlake2 Sodium Atomic symbol Na Atomic number 11 Atomic weight 22.98976928(2) Alkali metal, very reactive, 1 isotope 11 protons, 11 electrons, 12 protons

3. LecturePLUS Timberlake3 Chemical Reactions and Quantities Chemical Changes Balancing Chemical Equations

4. LecturePLUS Timberlake4 Physical Properties color melting point boiling point electrical conductivity specific heat density state (solid, liquid, or gas)

5. LecturePLUS Timberlake5 Physical Change Changes in physical properties melting boiling condensation No change occurs in the identity of the substance Example: Ice, rain, and steam are all water

6. LecturePLUS Timberlake6 Chemical Change Atoms in the reactants are rearranged to form one or more different substances Old bonds are broken; new bonds form Examples: Fe and O 2 form rust (Fe 2 O 3 ) Ag and S form tarnish (Ag 2 S)

7. LecturePLUS Timberlake7 Learning Check E1 Classify each of the following as a 1) physical change or 2) chemical change A. ____ a burning candle B. ____ melting ice C. ____ toasting a marshmallow D. ____ cutting a pizza E. ____ polishing silver

8. LecturePLUS Timberlake8 Solution E1 Classify each of the following as a 1) physical change or 2) chemical change A. __2__ a burning candle B. __1_ melting ice C. __2__ toasting a marshmallow D. __1__ cutting a pizza E. __2__ polishing silver

9. LecturePLUS Timberlake9 Chemical Reaction A process in which at least one new substance is produced as a result of chemical change.

10. LecturePLUS Timberlake10 A Chemical Reaction Reactants Products

11. LecturePLUS Timberlake11 Learning Check E2 A. How does an equation indicate a change in the identity of the reacting substances? B. How did the yellow and green reactants combine? C. Did all the reactants form product? Why or why not?

12. LecturePLUS Timberlake12 Learning Check E2 A. How does an equation indicate a change in the identity of the reacting substances? The formulas of the reactants are different than the formulas of the products. B. How did the yellow and green reactants combine? 1 yellow combined with 1 green. C. Did all the reactants form product? Why or why not? No. There were more yellow reactants than green.

13. Activity 1. Equations of burning, giving heat and oxides LecturePLUS Timberlake13 Finish equations and balance equations 1.C + O2 + heat --  2.H2 + O2 + heat --  3.Ca + O2 + heat --  4.Si + O2 + heat --  5.Fe + O2 + heat --  6.Al + O2 + heat --  7.Zn + O2 + heat ---> 8.Mg + O2 + heat --  9.S + O2 + heat --  10.Be + O2 + heat --  11.Sr + O2 + heat ---  12.Ba + O2 + heat --- 

14. EXIT QUIZ LecturePLUS Timberlake14 1.What is to balance equations? 2.What type of conservation do you see? 3.What is balance at the left? 4.What is balance at the right? 5.Are they equal?