Chemistry crossword

4. ability of a substance to conduct electricity or heat
6. mass of 1 atom of an element calculated from the total number of protons, neutrons, and electrons of that atom
7. pure substance formed when at least one metal and non- metal combine
10. 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
15. new substance produced in a chemical reaction between reactants
17. element that has both metallic and non metallic properties
18. pure substance that can not be broken down into other substances
20. number of protons in the nucleus of one atom of an element
23. description of a substance that can be pounded or rolled into sheets
24. vertical column of elements in the periodic table

1. substance that helps a chemical reaction proceed more quickly
2. change in the appearance or state of a substance that does not change the composition
3. an experiment in which all reactants and all product of a chemical reaction are accounted for
5. group 17 elements in the periodic table; the most reactive non-metals
8. vertical column of elements in the periodic table
9. description of a solid that can be stretched into long wire
10. slow chemical change that occurs when oxygen in the air reacts with a metal
11. pure substance formed when at least one metal and one non metal combine
12. chemical combination of two or more elements i a specific ratio
14. neutral particle in the nucleus of an atom
16. group 1 elements in the periodic table, not including hydrogen; the most reactive of the metals
19. catalyst involved in chemical reactions in living things
21. shiny,malleable,ductile, element that conducts electricity
22. invisible negatively charged particle that orbits the nucleus of an atom