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Across 3. two or more different molecular forms of the same element in the same physical state 9. boiling point of a liquid at a pressure of 101.3kPa 10. the energy an object has because of its motion 11. the temperature at which the vapor pressure of the liquid is just equal to the external pressure of the liquid 16. measure of the force exerted by a gas above a liquid 19. empty space with no particles and no pressure 20. when such a conversion occurs at the surface of a liquid that is not boiling 21. results from the force exerted by a gas per unit surface area of an object 22. particles arranged in an orderly, repeating, three-dimensional pattern called a crystal lattice

Down 1. results from the collisions of atoms and molecules in air with objects 2. the temperature at which a solid changes into a liquid 4. pressure used to require support 5. lacks an ordered internal structure 6. conversion of a liquid to a gas or vapor 7. a device that is used to measure atmospheric pressure 8. states that all matter consists of tiny particles that are constant in motion 12. rigid state without crystallizing 13. describes the only set of conditions at which all three phases exist in equilibrium with one another 14. relationships among the solid, liquid, and vapor states of a substance in a sealed container represented in a single graph 15. change of a substance from a sold to a vapor without passing through the liquid state 17. smallest group of particles within a crystal that retains the geometric shape of the crystal 18. the SI unit of pressure