1. Vegas Review Chemical Interactions Physical Science 2006

2. Tree roots can grow into the cracks of rocks and break them apart… Tree roots can grow into the cracks of rocks and break them apart… Chemical or Physical? Chemical or Physical? Weathering, Erosion, or Deposition? Weathering, Erosion, or Deposition?

3. Water can dissolve limestone (calcium carbonate) into its separate ions… Water can dissolve limestone (calcium carbonate) into its separate ions… Chemical or Physical? Chemical or Physical? Weathering, Erosion, or Deposition? Weathering, Erosion, or Deposition?

4. Water can move massive amounts of sediment in floods… Water can move massive amounts of sediment in floods… Chemical or Physical? Chemical or Physical? Weathering, Erosion, or Deposition? Weathering, Erosion, or Deposition?

5. Sitting around a campfire warms you due to the energy given off. What is the general formula for combustion (burning)? Sitting around a campfire warms you due to the energy given off. What is the general formula for combustion (burning)?

6. What is the point of “balancing” an equation? What is the point of “balancing” an equation? What can be changed? What can’t? What can be changed? What can’t?

7. C 8 H 18 + O 2  CO 2 + H 2 O + energy (octane) C 8 H 18 + O 2  CO 2 + H 2 O + energy (octane) How many hydrogen atoms in every octane molecule? How many hydrogen atoms in every octane molecule?

8. C 8 H 18 + O 2  CO 2 + H 2 O + energy (octane) C 8 H 18 + O 2  CO 2 + H 2 O + energy (octane) Balance this equation Balance this equation

9. 2C 8 H 18 + 25O 2  16CO 2 + 18H 2 O + energy (octane) 2C 8 H 18 + 25O 2  16CO 2 + 18H 2 O + energy (octane) If you burn 1000 molecules of octane, how many molecules of carbon dioxide are produced? If you burn 1000 molecules of octane, how many molecules of carbon dioxide are produced?

10. 2C 8 H 18 + 25O 2  16CO 2 + 18H 2 O + energy (octane) 2C 8 H 18 + 25O 2  16CO 2 + 18H 2 O + energy (octane) If you burn 1000 molecules of octane, how many molecules of oxygen will be consumed? If you burn 1000 molecules of octane, how many molecules of oxygen will be consumed?

11. 2C 8 H 18 + 25O 2  16CO 2 + 18H 2 O + energy (octane) 2C 8 H 18 + 25O 2  16CO 2 + 18H 2 O + energy (octane) If you burn enough molecules of octane to produce 90 molecules of water, how much carbon dioxide will be produced? If you burn enough molecules of octane to produce 90 molecules of water, how much carbon dioxide will be produced?

12. If potassium chloride dissolves chemically in water, what will actually be in the water? If potassium chloride dissolves chemically in water, what will actually be in the water?

13. If 50 “molecules” of potassium chloride dissolve chemically in water, what and how many will actually be in the water? If 50 “molecules” of potassium chloride dissolve chemically in water, what and how many will actually be in the water?

14. The solution of potassium chloride and a new solution of silver nitrate (AgNO 3 ) are combined. What possible new products could be made? The solution of potassium chloride and a new solution of silver nitrate (AgNO 3 ) are combined. What possible new products could be made?

15. If silver chloride is insoluble, what will you see in this solution of combined potassium chloride and silver nitrate (AgNO 3 )? If silver chloride is insoluble, what will you see in this solution of combined potassium chloride and silver nitrate (AgNO 3 )?

16. Pretend that the combination of potassium chloride and silver nitrate (AgNO 3 ) solutions produce a gas. What are the possibilities for what the gas is? Pretend that the combination of potassium chloride and silver nitrate (AgNO 3 ) solutions produce a gas. What are the possibilities for what the gas is?