Energy and Change

3. the reaction where a more complex molecule breaks into simpler products
6. a release of this is an indication of a chemical change
7. atoms combine to form a more complex molecule
8. energy from the electromagnetic spectrum
12. the energy of heat
13. a usually reversible change in the properties of a substance like size or shape
14. lit splints go out in the presence of this gas
15. the most energetic of the electromagnetic rays
16. the thing that changes most when particles change state
18. what is left after a chemical change
20. tells you how many atoms you have of a given element

1. this number tells you how many molecules you have in a chemical reaction
2. when oxygen reacts to an element or molecule
4. this law states that mass cannot be destroyed or created
5. the kind of change that means bonds between particles have been broken or made
9. the kind of energy that comes from breaking bonds between particles
10. the chemicals that you start with before a chemical change
11. what chemical reactions need to occur
13. a solid made when two chemical solutions mix
17. the kind of gas that makes a POP! when exposed to flame
19. the kind of gas that relights a glowing splint