1. WARM UP 9/18 1. How did you do on your test? Predict your grade. 2. How long did you study? 3. Is there anything you could have done better to prepare? 4. Summarize in three sentences or less what you learned from chapter 1. 5. Write 5 things that come to mind when I say “chemistry”.

2. NOTES 9/18 CH2: CHEMISTRY OF LIFE

3. BIOCHEMISTRY The chemistry of living things. The chemistry of living things.

4. History of the ATOM 460 BC – DEMOCRITUS *matter divided until smallest part “atomos” – unable to cut

5. 1800’s – DALTON *basic unit of all matter is atoms * solid, undividable particles

6. 1900’s – RUTHERFORD Spheres with mostly space Smaller particles in them

7. Subatomic articles – parts in an atom 1. Proton + charge 2. Neutron no charge 3. Electron - charge

8. ATOMIC NUMBER # of protons in an atoms Makes each atom different Most atoms neutral, so # protons = # electrons

9. ION – an atom with a charge because of too many or not enough electrons (makes the atom more reactive) ANION – Too many e-, so charge is negative CATION – Not enough e-, so charge is positive

10. ATOMIC MASS (NUMBER) Total number of protons and neutrons in an atom

11. ELEMENT – substance made of only one kind of atom

12. EXAMPLE 6 Carbon C 12.001 2.4 Atomic Number Atomic Mass Number Element

13. Periodic Table 1869 – MENDELEEV 1869 – MENDELEEV Organizes all the elements in a systematic way Organizes all the elements in a systematic way In order of atomic number In order of atomic number

15. PERIOD – each row across 7 periods All elements in same row are in same period

16. GROUP - (family) GROUP - (family) Each column Each column Elements in same group have similar properties Elements in same group have similar properties 18 groups 18 groups

17. 2 main groups – metals and nonmetals Hydrogen acts as both

18. ASSIGNMENT Elementsymbolgroupperiod Atomic # Mass # # protons Metal or nonmetal % of body O, C, H, N, Ca, P, K, S, Na, Cl, Mg, I, Fe

19. O 65% S.3% C 18.5% Na.2% H 9.5% Cl.2% N 3.2% Mg.1% Ca 1.5% I.1% K.4% Fe.1% P 1%

20. ASSIGNMENT 9/17 Finish chart – front and back – show me today Finish chart – front and back – show me today Page 34-36 READ – WRITE QUESTIONS Page 34-36 READ – WRITE QUESTIONS 1. How many electrons in an atom? 1. How many electrons in an atom? 2. How many e- can the 1 st shell hold? 2. How many e- can the 1 st shell hold? 3. The 2 nd shell? 3. The 2 nd shell? 4. The outermost shell? 4. The outermost shell? 5. What is important about the # and arrangement of e- in an atom’s outermost shell? 5. What is important about the # and arrangement of e- in an atom’s outermost shell? 6. When is an atom chemically reactive? 6. When is an atom chemically reactive? 7. What does chemically reactive mean? 7. What does chemically reactive mean? 8. What if the e- in the outer shell are paired? 8. What if the e- in the outer shell are paired?