Chapter 10 - T How to calculate between phase changes....

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5/7/09 10:19 PM Lacey and Sophie Chapter 10 General Properties of matter Solids o Fixed shape o Shape not set by container o Particles in fixed place and vibrate. o Little or no volume change under moderate pressure Liquid o No fixed shape o Takes shape of container. o Particles can move past one another. Gas o No fixed shape o Takes shape on container o Particles move through space. Liquid-gas Phase changes Evaporation- a process by which molecules pass from the liquid state to the gaseous state. Liquid- gas Freezing- gas- solid o Exothermic Condensation- gas - liquid o Exothermic Equilibrium- a state of balance between opposing processes where both processes occur at the same time. Vapor pressure- the partial pressure of gas molecules above a liquid (or solid) when the two states are in equilibrium. Boiling point- the temperature at which the vapor pressure of a liquid equals the external pressure. Liquid-- gas Energy Changes q=m*c*
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Unformatted text preview: T How to calculate between phase changes. Intermolecular Forces Influenced Properties by intermolecular forces o Boiling point o Freezing point o Vapor pressure Types of intermolecular forces Hydrogen-bonding o Strongest force o Force between (H-O)(H-N)(H-F) Dipole-Dipole o Between All polar molecules. London dispersion forces o Between all molecules. o Temporary attraction. o Weakest force Viscosity The resistance to flow. intermolecular forces, viscosity size, viscosity Viscosity of a liquid decreases as temp. Increases because intermolecular forces become weaker. Surface tension Surface tension is the amount of energy to break the intermolecular force of a liquid. o intermolecular forces, surface tension. o temperature, surface tension. Know what crystal lattice looks like. Amorphous Randomly arranged Crystalline Well-ordered pattern....
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Chapter 10 - T How to calculate between phase changes....

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