Chemistry Crossword

7. A chemical reaction that releases energy
9. An experiment in which one or more products of a chemical reaction can escape
10. A substance that helps a chemical reaction to proceed quicker
11. The new substance produced by the reactants
12. A reaction that takes place when two or more substances react to form new substances
18. Change that results when two or more substances react to form a new substance
20. group of atoms joined together by covalent bonds
22. the smallest part of an element that is representative of that element
23. A chemical change that occurs when oxygen in the air reacts with metal

1. A substance that reacts with another substance to create new substance with different properties
2. number of protons in the nucleus of one atom of an element
3. A pure substance that cannot be broken down into other substances
4. A table in which the elements are organized by their physical and chemical properties
5. The given name for the rows in a Periodic Table
6. The given name for the columns in a Periodic Table
8. A natural substance that is neither an acid nor a base
11. A group of ions that act as one
12. A chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
13. A study of chemical reactions which involves electricity
14. An experiment in which all of the products of a chemical reaction are sealed and accounted for
15. An atom that has become electrically charged by gaining or losing electrons
16. A neutral particle in the nucleus of an atom
17. Mass of one atom of an element
19. A chemical reaction that absorbs heat
21. A catalyst that is involved in the chemical reactions in living things