Chemistry 007, Fall 2007
Review Outline: Prelim 1, Chem 207
Chem 007 students from the most recent Weekly Group Session (9/30) expanded
(bulleted items) the review outline distributed in Chem 207. The expanded outline
First Prelim: Thursday, October 4, 7:30-9:00pm
Outline of Topics for Review
Atoms & the Structure of Matter (Chapter 2)
Two observations leading to Dalton's theory: conservation of mass in chemical
change & fixed compositions of chemical compounds.
• Mass is conserved in chemical reactions
• Compounds have atoms in fixed ratios (fixed compositions)
Dalton's atomic theory.
• each element is composed of atoms. Atoms can neither be created nor destroyed
• all atoms of an element are alike in mass
• in a compound, atoms of different elements combine in simple ratios
Electric and magnetic forces on charged particles.
Three experiments that revealed atomic structure: Thomson's expt with cathode
rays, Millikan's oil drop expt, Rutherford's expt.
• Thomson – existence of e-, ratio of mass to electric charge
• Millikan – charge of e-
• Rutherford – positive nucleus, massive center packed with protons
Neutrons and protons.
• Proton (+ charge), neutron (neutral), electron (- charge)
Describing the elements: atomic number, mass number, isotopes, ions.
• atomic #, Z, (protons); mass #, A, (protons + neutrons)
• isotopes – different number of neutrons
• ions – different numbers of electrons
Atomic masses: significance of the atomic mass unit.
• amu – standard of mass
The mole, Avogadro's number, molar mass of atoms and molecules.
• 1 mole = 6.022 x 10
• molar mass accounts for mass and natural abundance of each isotope.
Chemical Compounds (Chapter 3, Secs. 1-3)
Molecules: single, double, and triple covalent bonds, ionic bonds.
• covalent – electrons are shared between atoms
• ionic – electrons are transferred
• H-H (single), O=C=O (double), N