Particle theory

3. Anything that has mass and takes up space.
4. A group of atoms bonded together, forming the smallest unit of a compound.
5. A substance that can flow, such as a liquid or gas.
7. The smallest unit of an element that retains its properties.
11. The temperature at which a liquid turns into a gas throughout the substance. (7,5)
14. The movement of particles in a solid due to kinetic energy.
17. The process where a liquid changes into a gas at the surface.
18. The energy of motion that particles have. (7,6)
19. A state of matter with a fixed shape and volume.
20. Describes the forces that pull particles together, stronger in solids and weaker in gases.

1. A tiny piece of matter, such as an atom or molecule.
2. A property of gases that allows them to be squeezed into a smaller space.
4. The temperature at which a particular solid becomes a liquid. (7,5)
6. The type of motion that describes random movement of particles in a fluid.
8. A state of matter with a fixed volume but no fixed shape.
9. A property of solids that remains unchanged.
10. The process where particles spread out from an area of high concentration to low concentration.
12. A state of matter where particles move freely and spread out to fill their container.
13. Describes the volume of a solid or a liquid.
15. The shape of a liquid depends on this
16. Describes the position of particles in a solid.