Semmelweis Entrance Exam Questions and Answers Already Passed

Semmelweis Entrance Exam Questions and Answers Already Passed Electron configuration for cations Subtract 1 from exponent of highest n-value orbital (ex. remove from 4s before 3d) Ag+ = [Kr]5s^1 4d^9 Electron configuration for anions Add 1 to closest orbital Cl- = [Ne]3s^2 3p^6 Atomic orbitals s, p, d, f Primary vs secondary structures of proteins Primary - AA chain (linked by peptide bonds) Secondary - stabilized by non-covalent bonds (alpha helices & beta sheets) Most bonds in organic compounds are covalent Properties of water 1. polar 2. capable of adhesion and cohesion 3. high heat capacity (so it's hard to raise its temp) 4. great solvent 5. high heat of vaporization (allows humans to cool off via sweat) 6. water is less dense as a solid than a liquid Intermolecular forces of water hydrogen bonding Solution components 1. solvent (product being dissolved) 2. solute (medium for dissolving solvent) Molarity the number of moles of solute per liter of solution Solubility rules SOLUBLE 1. alkali metals (group 1) & NH4+ cations 2. NO3- or CH3COO- anions 3. Cl, Br, I (except when bonded to Ag+, Pb2+ or Hg2+) 4. sulfate ions (except when with Ca2+, Sr2+, Ba2+, Pb2+) INSOLUBLE 1. Metal oxides (except CaO, SrO, BaO) 2. Hydroxides (except when with Ca2+, Sr2+, Ba2+) 3. Carbonates, phosphates, sulfides, and