Across
- 3. a table in which all elements are found
- 4. a system in which the products cannot escape
- 7. a pure substance that is formed from at least one metal and one non-metal
- 9. a reaction the absorbs heat [energy]
- 10. chemicals that when combined create products
- 14. chemical reaction in cells
- 18. a chemical reaction that occurs with oxygen that releases energy
- 21. a slow reaction with oxygen and metal react together
- 22. change in state, solid to liquid.
- 23. the change in state from solid to gas and gas to solid.
Down
- 1. the mass of a single atom of an element
- 2. a pure substance that cannot be broken down
- 3. properties that describes appearance and composition
- 5. a reaction that releases heat[energy]
- 6. a system used around the world to ensure safety in a workplace
- 8. anything that has a mass and occupies a space.
- 11. the result of two or more reactants combining
- 12. an invisible part of an atom that has a negative charge.
- 13. a compound made from two or more non-metals
- 14. when two or more substances come together to create a new substance
- 15. a law that states that matter can not be destroyed or created
- 16. change in appearance or state that does not effect the composition
- 17. the number of electron/protons in an single atom of a element
- 19. the positively charged part in the nucleus.
- 20. an atom that becomes negatively or positively charged through the loss or gain of electrons