Across
- 2. atoms that has become electrically charged because it either lost or gained electrons.
- 5. a chemical reaction to create new substances
- 6. substance that helps speeds up a chemical reaction.
- 8. dull,brittle element that does not conduct electricity.
- 9. chemical change that releases heat
- 11. group 17 in the periodic table, the most reactive non-metals
- 19. takes place when two or more substances combine to form new substances.
- 22. RESPIRATION a chemical reaction that takes place in the cells of our bodies
- 24. often liquid or gas at room temperature.
- 25. mass of one atom of an element calculated from the total number of protons.
- 27. a slow chemical change that occurs when oxygen in the air reacts with a metal.
Down
- 1. a new substance produced in a chemical reaction between reactants.
- 3. catalyst involved in chemical reactions in living things
- 4. can be in between metals and non-metals
- 7. a substance that reacts with another substance in a chemical reaction to create a new substance with different products or properties.
- 10. an experiment when one or more products of a chemical reaction can escape.
- 12. change in appearance or state of substance that does not change composition.
- 13. chemical change that absorbs heat
- 14. results from a chemical reaction
- 15. substance made of only one kind of matter, which has
- 16. different properties.
- 17. an experiment where all reactants and products of a chemical reaction are accounted for.
- 18. GASES group 18 elements in the periodic table, the most stable and non reactive elements
- 20. solids at room temperature.
- 21. invisible negatively charged particle that orbits the nucleus of an atoms.
- 23. a chemical reaction that occurs when oxygen reacts with a substance to form a new substance and gives off energy.
- 25. unique set of properties.
- 26. element that has both metallic and non-metallic properties