PICK UP TODAY’S NOTES ON RAFFAY’S DESK

Reactivity of Na vs. Mg Why did I add phenolphthalein? What are the reactions of Na & Mg in water? How do you explain their reactivity?

Formal Lab Reports Purpose should be in full sentences Data is NOT the same as observations You need to record data (quantitative) as well as describe what you see (qualitative) Sample calculation for each type of calculation you do Why did I add phenolphthalein?

Formal Lab Reports Discussion must be in full sentences and you were asked to INCLUDE the answers to the discussion Conclusion should be short and sweet. Just tell me the results you got! Rf values & unknown mixture

Unit 3 Review

Models of the Atom Dalton: hypotheses and laws Thomson: plum pudding model Rutherford: nuclear model Bohr: planetary model, Bohr diagrams Heisenberg & Schrodinger: electron cloud model

Subatomic Structure Proton, electron, neutrons Charge, mass, location? How does changing each of the above change an element or atom? Ions, isotopes, % abundance Mass number vs. atomic mass Calculating atomic mass

Periodic Table How was it developed? How is it organized? Periods vs. families/groups Trends: subatomic particles, properties, reactivity, valence electrons, ionization energy, atomic radius, electronegativity Octet rule Metals, nonmetals, semiconductors Homonuclear diatomic molecules

Lewis Structures & Bonding Ionic vs. covalent bonds Lewis structures of atoms, ions, ionic & covalent compounds Dipole moments & polarity >1 possible structure? Look at formal charge How is bonding affected by valence electrons?

P 188 #86 e, f, k, l, m, p, q, r, s, v, x, y