Chemistry Crossword

2. the smallest part of an element that is representative of that element; a neutral particle made up of a nucleus containing protons and neutrons, and in which the number of electrons equals the number of protons
6. invisible negatively charged particle that orbits the nucleus of an atom
8. description of substance that can be pounded or rolled into sheets
9. compound that dissolves in water to form a solution with a pH higher than 7
11. substance that strongly resists the flow of energy
13. a reaction that takes place when 2 or more substances react to form new substances
15. colourless, odourless gas; produced by incomplete combustion of chemicals containing carbon (e.g. hydrocarbons); major source: motor vehicles
18. chemical reaction that absorbs energy
20. measure of atomic mass; 1 amu is equal to 1/12th the mass of a carbon 12 atom
21. catalyst involved in chemical reactions in living things
22. mass of one atom of an element calculated from the total number of protons, neutrons, and electrons of that atom; measured in atomic mass units (amu)
23. creation of electrical current
24. ability to do work

1. description of a solid that can be stretched into a long wire
3. pure substance that cannot be broken down into other substances; substance made up of only 1 type of atom
4. change of state from liquid to a gas
5. group 2 elements in the periodic table; their reactivity is not as strong as that of the alkali metals
7. change that results when 2 or more substances react to create a different substance or substances; the new substances have completely different properties from the original ones
10. combination of symbols that represent a compound; the formula identifies the elements in the compound and the amount of each element
12. an experiment in which all reactants and all products of a chemical reaction are accounted for
14. group 1 elements in the periodic table, not including hydrogen; the most reactive of the metals
16. chemical combination of 2 or more elements in a specific ratio
17. chemical reaction that releases energy
19. number of protons in the nucleus of one atom of an element