Intermolecular Forces Test Questions – Flashcards
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| Three types of intermolecular forces |
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London Dispersion Dipole-Dipole Ionic |
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| What is an ion dipole? |
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| Force between an ion and the partial charge on the end of a polar molecule NOT REALLY IMPORTANT |
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| Dipole-Dipole |
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| Polar molecules attracted to each other |
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| With molecules of equal mass and size what happens with increasing polarity? |
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| Dipole-Dipole Strength increases |
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| London Dispersion |
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| Everything has London Dispersion Attraction between all molecules |
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| As molecular weight increases so does what? |
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| Strength of London Dispersion |
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| Hydrogen bonding occurs when Hydrogen bonds to? |
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| F, O, or N |
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| Hydrogen bonding Definition |
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| Very strong Dipole-Dipole H-F is most polar, so strongest |
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| Which is more dense. Ice or Water? Why? |
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| Water Molecules assume an ordered, open arrangement |
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| Ions are involved Polar molecules and ions are present |
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| Ion-Dipole Forces |
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| Ions are involved Only ions are present |
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| Ionic Bonding |
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| Ions aren't involved Polar molecules aren't involved |
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| London Dispersion Forces |
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| Ions aren't involved Polar molecules are involved Hydrogen not bonded O, N, or F |
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| Dipole-Dipole Forces |
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| Ions aren't involved Polar molecules are involved Hydrogen bonded O, N, or F |
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| Hydrogen Bonding |
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| Organize these in terms of 1. being Weakest Dipole-Dipole H-Bonding Ionic Bonding London Dispersion Ion-Dipole |
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| First is weakest remember 1. London Dispersion 2. Dipole-Dipole 3. H-Bonding 4. Ion-Dipole 5. Ionic Bonding |
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| Viscosity |
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| Resistance of liquid to flow |
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| Viscosity ______ as molecular weight increases |
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| Increases |
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| Viscosity _____ with increasing temperature |
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| Decreases |
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| Why do liquids bead up on surfaces |
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| Surface Tension |
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| Surface Tension |
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| Energy required to increase the surface area of a liquid |
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| Heat of fusion |
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| Energy required to melt a solid |
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| Heat of vaporization |
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| Energy required to make a liquid a gas |
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| Critical temperature |
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| Highest temperature at which a liquid phase can form |
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| Critical Pressure |
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| Pressure required at the critical tiemperature |
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| Nonpolar, low weight substances have _____ critical temperatures and pressures |
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| Lower |
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| Vapor Pressure |
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| Pressure exerted by a gas on its space |
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| Volatile liquids Definition |
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| Liquids that evaporate readily/quick |
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| Volatile liquids have __ vapor pressures |
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| High |
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| Triple Point |
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| All 3 phases at equilibrium |
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| Orderring of atoms in Crystalline solid |
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| Well defined |
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| Properties of molecular bonds in crystalline solids |
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| Fairly soft Low melting point Dont conduct electricity |
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| Forces between molecular bonds in crystalline solids |
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| LD Dipole-Dipole H-Bonds |
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| Form of unit particles of molecular bonds in crystalline solids |
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| Atoms or molecules |
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| Properties of Covalent-network bonds in crystalline solids |
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| Very Hard Very high melting point Dont conduct electricity |
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| Properties of Ionic bonds in crystalline solids |
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| Hard and brittle High melting point Dont conduct electricity |
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| Properties of Metallic bonds in crystalline solids |
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| Soft to very hard Low to very High melting point Conduct electricity Malleable and Ductle |
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| Forces between Covalent-network bonds in crystalline solids |
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| Covalent Bonds |
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| Forces between Ionic bonds in crystalline solids |
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| Electrostatic attractions? |
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| Forces between Metallic bonds in crystalline solids |
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| Metallic Bonds |
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| Form of unit particles of Covalent-network bonds in crystalline solids |
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| Atoms connected in a network of covalent bonds |
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| Form of unit particles of Ionic bonds in crystalline solids |
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| Positive and negative ions |
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| Form of unit particles of Metallic bonds in crystalline solids |
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| Atoms |
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| What are Diamond and SiO2 and Graphite |
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| Covalent Network |
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| Most substances that are gas or liquid at room temperature are usually ______ solids |
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| Molecular |
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| What is the only type of bond not due to LD |
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| The bonds in metallic solids |
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| Stronger the IMF the ____ the viscosity |
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| Greater |
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| What are held together by a "sea" of electrons |
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| Metallic Solids |
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| volatility= what in relation to imf |
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| Lowest |
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| Odor |
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| High vapor pressure and volatility |
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| What conducts electricity only when melted or dissolved |
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| Ionic |
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| What is usually water soluble |
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| Ionic |
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| Insoluble in water |
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| LD nonpolar with covalent bonds |
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| Insoluble in common solvents |
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| Covalent |
