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## Postulates of Kinetic Molecular Theory: ### 3. There is space between particles. The amount of space in between particles is related to the substance's state of matter. - **Gas**: Particles are widely spaced, can be compressed and expand, cool or heat - **Liquid**: Particles are closely packed...

## Postulates of Kinetic Molecular Theory: ### 3. There is space between particles. The amount of space in between particles is related to the substance's state of matter. - **Gas**: Particles are widely spaced, can be compressed and expand, cool or heat - **Liquid**: Particles are closely packed, can be compressed and expand, cool or heat - **Crystalline solid**: Particles are tightly packed, cannot be compressed or expanded, cool or heat ## Postulates of Kinetic Molecular Theory: ### 4. Phase changes happen when the temperature of the substance changes sufficiently. - **Heating curve for water:** As heat is added to solid water, the temperature increases until it reaches 0°C, the melting point. At this point, the phase change, added heat goes into changing the state from a solid to liquid. Only when this phase change is complete, the temperature can increase (CC BY 3.0 Unported Community College Consortium for Bioscience Credentials). **The temperature of a substance does not change as the substance goes from one phase to another.**