matter and energy

3. a series of interactions in which one organism eats another to gain energy
4. the type of change that results in the formation of new chemical substances
5. elements located to the right of the stair-step (zig zag) line on the periodic table
9. two or more substances that are together but not chemically combined
11. a table of the chemical elements arranged in order of atomic number
13. the ability to move heat or electricity from one place to another
14. positively-charged subatomic particles found in the nucleus
16. a diagram that shows the amount of energy moving from one feeding (trophic) level to the next
18. the amount of space an object occupies
21. the law that states matter cannot be created or destroyed
23. the ratio of an object's mass to its volume (M/V)
24. neutrally-charged subatomic particles found in the nucleus

1. the type of change in which the form (appearance) of matter is altered but one substance is not changed into another
2. the number of protons plus the number of neutrons contained in an atom's nucleus
6. negatively-charged subatomic particles found in a cloud surrounding the nucleus
7. a pure substance that cannot be broken down chemically
8. a substance that consists of 2 or more elements combined in a set ratio
10. elements or compounds on the left side of a chemical reaction (what you start with)
12. the number of protons or electrons contained in an element
15. elements or compounds on the right side of a chemical reaction (what you produce)
17. the center of an atom that contains the protons and neutrons
19. two or more atoms joined (bonded) together chemically
20. the amount of matter in an object
22. a diagram that shows many overlapping food chains