Chem 115 1st EditionExam # 4 Study Guide Lectures: 19-28Lecture 19 1. Know the smallest to largest wavelength frequenciesSmallest-gammaLargest-radio2. What does frequency represent?Cycles per second3. What does wavelength represent?Distance wave travels in 1 cycle4. What is amplitude?Height of wave crest/depth of trough5. What is the speed of light constant?C= (frequency) (wavelength)6. What is C?3.00 X 108 m/s7. Know how to calculate wavelength8. What is Planck’s constant?6.626 X 10-34 Jsec9. What is the equation for energy?E = (Planck’s constant) (frequency)10. What is a photon?Light pocket, 1 energy rotationLecture 201. Know how to calculate energy from wavelengthLecture 211. Know the similarity between matter and energyParticulate, massive, and wavelike2. Know properties of matterBoth particles and waves3. What is Heisenberg’s uncertainty principle?Not possible to know a moving atom’s position AND momentum4. Know sigma squared probability90%Lecture 221. Know the different orbitalsS, D, P, F orbitals2. What is shielding?Inner electrons shield outer electrons3. What is Aufbau principle?Electrons are always in lowest energy sublevel possible4. What is the exclusion principle?Each orbital may only contain 2 electronsLecture 231. Know how to write orbitals of an element2. Know the exceptionsChromium and copperLecture 241. Know the trends2. Know metallic behaviorLecture 251. Know ionic size vs. atomic size2. Know the difference between covalent, ionic, and metallic bonding3. Know the properties of ionic compoundsHardBrittleRigidHigh melting pointsDon’t conduct energy/electricityLecture 261. Know the molecular shape of compounds2. Know how to read Lewis structuresLecture 271. What is electronegativity?Ability of an atom in a covalent bond to attract the shared electron pair2. What is polar covalent bonding?Covalent bond where shared electron pair isn’t shared equallyLecture 281. What is metallic bonding?All metal contribute valence electrons to form delocalized “sea” of
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