Unit B - Matter and Chemical Change.

3. a vertical column of elements in the periodic table
5. change of state form a gas to a liquid
8. the smallest part of an element that is representative of that element a neutral particle made up of a nucleus containing protons and neutrons
13. 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. 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.
18. reaction chemical reactions that gives off energy
20. group two elements in the periodic table , not including hydrogen, the most reactive of the metals
21. a material that electric charge can move through easily

1. slow chemical reaction that occurs when oxygen hits metal
2. Group 1 elements in the periodic table not including hydrogen the most reactive non metals
4. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and gives off energy
6. catalyst involved in all living things
7. mass of atom of an element calculated from the total number of protons neutrons and electrons.
9. chemical combination of two or more elements in specific ration
10. change of state from gas to a solid.
11. number of protons in the nucleus of one atom of an element
12. substance that helps a chemical reaction to proceed quickly
13. a reaction that takes place between two elements
14. reaction chemical reaction that absorbs energy
15. 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
17. of mass principle that matter is not created or destroyed. It can not be destroyed or created, the mass is always equal.
19. ability of a substance to conduct electricity or heat
22. amount of mass in a given volume of a substance