1. Review Chemical and Physical Changes Chemical and physical properties

2. For each of the following, give an example of what you might see in a chemical reaction that would indicate…..: a. color change b. energy change c. Precipitate d. gas formation

3. For each of the following, give an example of what you might see in a chemical reaction that would indicate…..: a. color change color disappears or you get a color that isn’t the result of color wheel mixing (ex..yellow + blue = green, this doesn’t necessarily indicate a color change) b. energy change temperature change, got hotter or colder, light produced c. Precipitate formation of a solid d. gas formation bubbles/foaming

4. Label the following as chemical or physical changes. Cu (s)  Cu (g) H 2 O (g)  H 2 O (s)

5. Label the following as chemical or physical changes. Cu (s)  Cu (g) H 2 O (g)  H 2 O (s)

6. Iron rusts and copper tarnishes. What kind of change is this? What evidence did you use to answer this question?

7. Iron rusts and copper tarnishes. What kind of change is this? chemical What evidence did you use to answer this question? Color change, a new material was formed at the end of the change, it is not reversed using a physical process.

8. Bonding Compare and contrast ionic & covalent bonds

9. Bonding Compare and contrast ionic & covalent bonds IonicIonic & CovalentCovalent Transfer electrons Occur between metals and nonmetals Form Crystal structuresForm between valence electrons Are broken and created in chemical reactions Hold energy Share electrons Occur between nonmetals Form individual Molecules

10. Which of the following compounds form are ionic bonds and which are covalent NaCl Mg 2 SO 4 O 2 CaCl 2

11. Which of the following compounds form are ionic bonds and which are covalent NaCl ionic- metal/nonmetal Mg 2 SO 4 ionic – metal/nonmetal O 2 covalent - nonmetals CaCl 2 ionic – metal/nonmetal

12. Which of these reactions is exothermic…how do you know? Which is endothermic…how do you know? 1.H 2 CO 3 → H 2 O+ CO 2 + energy 2.NH 3 + H 2 O + energy → 3NH 4 OH 3.SnO 2 + H 2 → Sn + H 2 O

13. Which of these reactions is exothermic…how do you know? Which is endothermic…how do you know? 1.H 2 CO 3 → H 2 O+ CO 2 + energy 2.NH 3 + H 2 O + energy → 3NH 4 OH 3.SnO 2 + H 2 → Sn + H 2 O

14. Specific heat is the amount of energy it takes to raise the temperature of 1 gram of a substance by 1 degree. The higher the specific heat, the more energy required to raise the temperature. If all the materials to the left are exposed to the SAME AMOUNT OF HEAT Which will be the hottest After 2 minutes? Which will be the coolest After 2 minutes?

15. Specific heat is the amount of energy it takes to raise the temperature of 1 gram of a substance by 1 degree. The higher the specific heat, the more energy required to raise the temperature. If all the materials to the left are exposed to the SAME AMOUNT OF HEAT Which will be the hottest After 2 minutes? Lead b/c it takes less energy to increase its temperature (low specific heat) Which will be the coolest After 2 minutes? Basalt b/c it takes the most energy to increase its temperature (high specific heat)

16. 200 mL of Isopropyl alcohol (rubbing alcohol) boils at 180.7F. What temperature will 100 mL of isopropyl alcohol boil at? 10g of gold melts at 1,948F. At what temperature would 20g of gold melt?

17. 200 mL of Isopropyl alcohol (rubbing alcohol) boils at 180.7F. What temperature will 100 mL of isopropyl alcohol boil at? 180.7 10g of gold melts at 1,948F. At what temperature would 20g of gold melt? 1,948

18. What physical property of copper makes it good to use in wiring? What physical property of zinc allows it to be hammered into foil? What physical property of salt (NaCl) allows us to create salt water solution for eyedrops?

19. What physical property of copper makes it good to use in wiring? Conductivity, ductility What physical property of zinc allows it to be hammered into foil? malleability What physical property of salt (NaCl) allows us to create salt water solution for eyedrops? solubility

20. Your brother finds a golden-colored cube at a flea market. The price is $100, and your brother is sure that it is gold. Which of the following will most accurately tell you if it is gold? A.The color B.You can hammer it into foil C.Its density D.Its solubility in water

21. Your brother finds a golden-colored cube at a flea market. The price is $100, and your brother is sure that it is gold. Which of the following will most accurately tell you if it is gold? A.The color B.You can hammer it into foil C.Its density D.Its solubility in water

22. You are camping and have a campfire to use for cooking. You burn the wood so that you can: Boil water for the coffee Heat the pan for the pancakes Cook the pancakes Describe each of these as a physical or chemical change. What evidence did you use for your decision.

23. burn the wood chemical: creates a new material, temperature increase, light created, smoke/gas produced Boil water for the coffee physical: change of state liquid  gas Heat the pan for the pancakes physical..the temperature of the griddle is increasing because we are increasing the energy in the materials. This reflects the physical property of conductivity. If we remove the griddle from the heat, it cools down. Cook the pancakes chemical: gas produced (bubbles that that are created in the batter) and a color change. Describe each of these as a physical or chemical change. What evidence did you use for your decision.

24. Chem review Classes: metal, nonmetal, metalloid Where are they on the periodic table and what are their properties. Families (1,2,17,18): name, reactivity and valence number Calculating the number of neutrons in an atom