7th unit vocab review

3. a state of matter without any defined volume or shape (related word: gaseous)
4. the smallest unit of an element that has all the chemical properties of that element
7. energy - energy in the form of heat
9. the energy an object has because of its motion
10. substance - a material with a particular chemical makeup
11. a state of matter with a defined volume but no defined shape and whose molecules roll past each other
15. a pure substance that is formed when two or more different elements combine
16. the transfer of heat energy within an object, or between objects that are directly touching each other, due to collisions between the particles in the objects
17. the temperature at which a liquid turns into a solid
18. the process by which a gas changes into a liquid
21. a combination of substances that can be physically separated from one another
22. the process in which matter changes from a liquid to a gas
23. a pure substance that cannot be broken down into simpler substances by chemical reactions

1. two or more atoms joined together
2. material that has mass and takes up some amount of space
5. the temperature at which a solid turns into a liquid
6. the temperature at which a liquid changes into a gas
8. the one- or two-letter representation of an element; symbols are often derived from the Latin name of the element
12. matter with a fixed volume and shape
13. a large molecule that is made of small molecules that are arranged in a repeating structure
14. a set of symbols used to describe the elements within a substance
19. a measure of the average kinetic energy ,of the atoms in a system used to express thermal energy in degrees
20. pressure the force that air puts on an area (related word: pressure)