Monica Burkett APES Ch2

2. an atom or a group of atoms with one or more net positive or negative electrical charges
4. energy travels in the form of a wave
5. combination of two or more atoms of the same chemical element
6. whenever energy is convert we end up with a lower or less usable energy than we started with
9. stored and potentially available
10. a well-tested and widely accepted scientific hypothesis
11. all elements are made up of atoms
12. smallest unit of matter into which an element can be divided
13. occurs when the nuclei of an isotope splits apart in to lighter nuclei
14. energy is converted from one form to another, no energy is created or destroyed
16. occurs when nuclei of unstable isotopes emit fast moving chunks of matter
17. mass of an atom

1. contain at least two carbon atoms combined with atoms of one or more other elements
2. forms of an element having the same atomic number but different mass numbers
3. whenever matter undergoes a physical or chemical change
4. is a measure of capacity of a type of energy to do useful work
6. a well-tested and widely accepted description of what we find happening repeatedly in nature in the same way
7. a double helix DNA molecule wrapped around so proteins
8. occurs when two isotopes are forced together at extremely high temperatures
15. is a measure of how useful a form of matter is to humans as a resource