Cumulative review transfer item: In AP Chem, this item is specifically about Atomic Structure and Properties: mass spectrometry, electron configuration, periodic trends, photoelectron spectroscopy. Which AP-style explanation about Atomic Structure and Properties is strongest? State the setup, compute carefully, and interpret the result.

Cumulative review transfer item: In a molecular and ionic structure setting, use Lewis structures, formal charge, resonance, VSEPR geometry, bond polarity, and ionic versus covalent bonding. Use VSEPR theory to predict the molecular geometry of sulfur tetrafluoride ($SF_4$). Provide a concise written explanation.

Cumulative review transfer item: In an intermolecular forces setting, use London dispersion, dipole-dipole forces, hydrogen bonding, vapor pressure, boiling point, and molecular polarity. Determine which bond is more polar: C-F or C-O. Justify using electronegativity trends. State the setup, compute carefully, and interpret the result.

Cumulative review transfer item: In AP Chem, this item is specifically about Chemical Reactions: balanced chemical equations, mole ratios, stoichiometric conversion, limiting reactants. Which common AP Chemistry mistake should be avoided in Chemical Reactions? Provide a concise written explanation.

Cumulative review transfer item: In AP Chem, this item is specifically about Kinetics: atomic structure, bonding, intermolecular forces, chemical reactions. For Kinetics, which answer best connects Kinetics to particle-level reasoning? State the setup, compute carefully, and interpret the result.

Cumulative review transfer item: In an AP Chemistry thermodynamics setting, use calorimetry, heat transfer, enthalpy, entropy, Hess's law, system/surroundings, and particle-level energy explanations. A reaction releases 45 kJ of heat at constant pressure. What is the sign of \Delta H for the reaction system? Provide a concise written explanation.