Across
- 2. a slow chemical change when oxygen reacts with metal.
- 4. combination of symbols that represent a compound
- 6. when two or more chemicals react to form a new substance.
- 8. experiments where material can escape
- 11. shows how many protons are in the nucleus of one atom in the element.
- 13. amu for short.
- 15. _______________ are formed when non-metals combine.
- 16. a reaction that absorbs heat energy.
- 17. an organized table of the elements
- 19. a fast reaction that occurs when oxygen reacts with a substance.
- 20. had a model that showed the atom looking like a solar system
- 22. believed matter was made up of water,fire,earth, and air
- 23. most stable and nonreactive elements in the periodic table.
- 24. liquid,gas,solid
- 25. new materials produce after the reaction.
Down
- 1. a reaction that releases heat energy.
- 3. chemical reaction that takes place in the cells in your body
- 5. _______ are shiny, malleable and ductile.
- 7. the mass of one atom in an element
- 9. colour,lustre,hardness
- 10. _____________ are formed when a non-metal and metal combine.
- 12. anything that has mass and occupies space.
- 14. experiments where no material can escape
- 18. a substance that can't be simplified.
- 21. the materials at the start of a reaction.