Across
- 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
Down
- 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