Chemistry Crossword

2. cloudy mixture in which tiny particles of one substance are held within another
4. substances that strongly resist the flow of electricity
5. the smallest part of an element that is representative of that element
7. invisible negatively charged particle that orbits the nucleus of an atom
10. element that has both metallic and non-metallic properties
11. mixture in which the different substances that make up the mixture are visible
16. slow chemical change that occurs when oxygen in the air reacts with a metal
17. in the appearance or state of a substance
19. the most stable and unreactive elements
21. a table in which the elements are organized by their physical and chemical properties
22. an experiment in which one or more products of a chemical reaction can escape
23. chemical reaction that releases energy
25. substances that helps a chemical reaction to proceed more quickly.

1. positively charged centre of an atom contains protons and neutrons
2. an experiment in which all reactants and all products of a chemical reaction are accounted for
3. pure substances formed when at least one metal and one non metal
6. pure substance formed when non metals combine
8. substance made only of one kind of matter
9. dull,brittle element that does not conduct electricity
12. change that results when two or more substances react to create a different substance or substances
13. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
14. atom that has become electrically charged because it has lost or gained electrons
15. chemical reaction that absorbs energy
18. pure substance that cannot be broken down into other substances
20. mass of one atom of an element calculated from the total number of protons
24. the most reactive non-metals