Unit B - Matter and Chemical Change.

1. catalyst involved in all living things
3. change of state from gas to a solid.
5. a material that electric charge can move through easily
7. the smallest part of an element that is representative of that element a neutral particle made up of a nucleus containing protons and neutrons
8. reaction chemical reaction that absorbs energy
9. substance that helps a chemical reaction to proceed quickly
11. change that result when two or more substance react to create a different substance or substance the new substances have completely different properties from the original ones.
13. slow chemical reaction that occurs when oxygen hits metal
15. description of how a substance interacts with other substance such as acids chemical properties are observable only when a chemical change occurs to form new substances
16. a vertical column of elements in the periodic table
18. number of protons in the nucleus of one atom of an element
20. a reaction that takes place between two elements
21. mass of atom of an element calculated from the total number of protons neutrons and electrons.
22. Group 1 elements in the periodic table not including hydrogen the most reactive non metals

2. reaction chemical reactions that gives off energy
4. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and gives off energy
6. ability of a substance to conduct electricity or heat
10. amount of mass in a given volume of a substance
11. change of state form a gas to a liquid
12. group two elements in the periodic table , not including hydrogen, the most reactive of the metals
14. of mass principle that matter is not created or destroyed. It can not be destroyed or created, the mass is always equal.
17. chemical combination of two or more elements in specific ration
19. combination of symbols that represent a compound” the formula identifies the elements into the compound the formula identifies the element s in the compound and the amount of each element