1. Announcements Lab tomorrow! Bring Usage Fee Card & Wear Proper Attire Electronic HW #1 (Type 1) due tonight by 11:59pm HW #1 (Type 2) due tomorrow by 7:00pm Course Contents link (top of page) brings you to the list of homework folders.

2. Homework tips Use the video tutorials and the video hints (with Gretchen)! Read instructions in lon capa. (E.g. naming). Use the discussion board to talk to classmates. Watch out for sig figs…

3. How many ways to write 1000? Scientific notationEnter in lon capa as: How many sig figs? 1X10 3 1e31 1.0X10 3 1.0e32 1.00X10 3 1.00e33

4. Clicker #1 Which of the following best describes the substance XeF 4 ? I.Element II.Molecule III.Compound IV.Heterogeneous mixture V.Homogeneous mixture A)III only B)I, II C)II, III, IV D)II, III, V E)II, III

5. Physical Change A change in one or more physical properties, but no change in the fundamental components. Changes of State

6. Changes of State For H 2 O H 2 O H 2 O H 2 O

7. Chemical Change A change in the fundamental components of the substance. Create something new/different Chemical changes are called reactions.

8. From Thursday…

9. Clicker #2 How many of the following are examples of a chemical change? I.burning of wood II.pulverizing (crushing) rock salt III.dissolving of sugar in water IV.melting a popsicle on a warm summer day A) 0 B) 1 C) 2 D) 3 E) 4

10. From Thursday… What quantitative evidence is there for the idea of atoms and molecules?

11. Dalton’s Theory All matter is made of atoms. Atoms of the same element are the same* (atoms of different elements are different). Atoms are indestructible.* Chemical reactions are rearrangements of atoms. Compounds are combinations of atoms. *Not quite right (isotopes, sub-atomic particles)

12. Clicker #3 Which of the following statements regarding Dalton’s atomic theory are still believed to be true? I.Elements are made of tiny particles called atoms. II.All atoms of a given element are identical. III.A given compound always has the same relative numbers and types of atoms. IV. Atoms are indestructible. A)I only B)I, II, III C)I, III D)II, III, IV E)II, IV

13. Clicker #4 Dalton’s theory does not explain: A)why water is “sticky” (attracted to itself). B)why some elements are diatomic. C)why elements have different reactivities. D)why some elements or compounds conduct electricity. E)any of the above.

14. Periodic Table Symbol, name, number of protons (all of these are related). Number of electrons in a neutral atom. Metals and non-metals. Charges for common ions.

15. varies Periodic Table +1 +2-3 0 -2 +3 +1

16. By the Exam… Know the polyatomic ions and charges (Table 5.4). Know common ions and symbols (Tables 5.1 and 5.2). The charges for these come from the periodic table. Know prefixes (Table 5.3).