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Unformatted text preview: s well as dipole‐dipole forces or hydrogen bonding. – Know that hydrogen bonds are the strongest type of intermolecular force, dipole‐dipole forces are the next strongest, and London forces are generally the weakest. – Recognize that London forces increase with more electrons—use the number of electrons to determine relative strength of London forces for different molecules. – Know the terms: evaporation, boiling point, vapor pressure, volatile, nonvolatile, hydrophilic, hydrophobic – Recognize how IMF’s influence vapor pressure and boiling point. – Given different substances, be able to rank them in terms of increasing boiling point based on IMF’s. • Given a bond or intermolecular force, identify it a polar covalent, nonpolar covalent, ionic, metallic, ion‐dipole forces, London/dispersion forces, dipole‐dipole forces, and/or hydrogen bonding. • Know ionic and covalent bonds are stronger than all intermolecular forces, even hydrogen bonds. • Given its formula, classify a solid as ionic, molecular, metallic or network covalent (e.g. diamond). • Know the unique properties of ice resulting from the hydrogen bonds between molecules in the solid (e.g. density of solid versus liquid, why snowflakes have hexagonal symmetry, effects on aquatic life, etc.). • Use “Like Dissolves Like” to predict if a substance will be soluble/insoluble in or miscible/immiscible with another substance based on its polarity (for molecules). – Recognize that some ionic compounds (e.g. NaCl) dissolve in polar liquids like water, but ionic compounds never dissolve in nonpolar liquids. Chapter 11: Gases • Know the properties of gases. • Know definitions: vacuum, gas pressure, atmospheric pressure, compressibility • Recognize that atmospheric pressure decreases with altitude • Be able to explain how atmospheric pressure aids drinking liquids with a straw Gas pressure and Atmospheric pressure • Be able to convert between units of pressure: 1 atm ≡ 760 torr ≡ 760 mmHg = 14.7 psi CHEM121 Exam 2 Study Guide page 3 of 4 Chapter 5: Molecules and Compounds ionic compound: a compound consisting of metal cations and anions held together by ionic bonds molecule (or molecular compound): a compound consisting of nonmetal atoms held together by covalent bonds Diatomic elements: H2, N2, O2, F2, Cl2, Br2, I2, Know the NAMES AND SYMBOLS OF ALL ELEMENTS included on pp. 10‐11 of...
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