Chemistry Crossword

1. new materials produced by the reaction
4. substances that help reaction proceed faster
6. is anythng that has mass and occupies space
7. solid to a gas
9. is a slow chemical change that occurs when oxygen reacts with metal (rusting)
11. substance able to conduct electricity
12. horizontal row on periodic table
13. elements are found in groups and row
16. vertical column on the periodic table
17. when reaction absorbs the heat
20. most reactive non-metals
21. most reactive metals
24. have both matallic and non-metallic properties

2. the materials at the start of the reaction
3. substance made up of only one type of subatance
5. symbols design to help protect people who use materials that might be harmful at work
8. pure substance formed when at least one metal and non-metal combine
9. reaction that occurs when oxygen reacts with a substance to form a new substance to give off energry
10. became valuable because it could be used to make pots, pans, etc
14. state from gas to liquid
15. smaller than an element
18. one of the softest rock
19. gases the most stable and unreactive element
22. Hardness is usually measured n the __ scale
23. abbreviation for atomic mass shows the sum of protons and neutrons in an atom