State of Matter

Intermolecular Forces

• Forces between separate atoms that are attractive at distance but repulsive at close range
• Alway try to bring molecuse together

Thermal Energy

• Energy that causes the molecules to vibrate and spread apart

Solids

• phases of matter with a definite shape and constant volume

Physical Properties of Solids

• Strength:ability to maintain shape under great force
• Elasticity: the ability to stretch and return to the same shape

Properties (continued)

• Ductility: the abiltiy to bend without breaking
• Thermal Conductivity: the ability to transmit heat energy
• Electrical conductivity: the ability to allow electricity to flow

Heat Conductors

• Materials that conduct heat easily

Thermal Insulator

• Material that conduct heat poorly

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