Chemistry Crossword

3. group 17 elements in the periodic table;the most reactive non-metals
7. cloudy mixture in which tiny particles of one substance are held within another, and the particles can be separated out
10. positively charged particle in the nucleus of an atom
12. an experiment in which one or more products of a chemical reaction can escape
16. chemical reaction that absorbs energy
18. group 18 elements in the periodic table;the most stable and unreactive elements
19. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
20. change in the appearance or state of a substance that does not change the composition
22. change that results when two or more substances react to create a different substance or substances
24. pure substance formed when non-metals combine
25. combination of pure substances

1. description of a substance that can be pounded or rolled into sheets
2. substance that helps a chemical reaction to proceed more quickly
4. substance that strongly resists the flow of electricity
5. catalyst involved in chemical reactions in living things
6. chemical reaction that releases energy
8. pure substance formed when at least one metal and one non-metal combine
9. neutral particle in the nucleus of an atom
11. a table in which the elements are organized by their physical and chemical properties
13. heterogeneous mixture;mixture in which the different substances that make up the mixture are visible
14. vertical column of elements in the periodic table
15. substance made of only one kind of matter, which has a unique set of properties
17. element that has both metallic and non-metallic properties
21. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
23. cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance