Chemistry Crossword

4. catalyst involved in chemical reactions in living things
6. pure substance formed when at least one metal and one non-metal combine
7. ability of a substance to conduct electricity or heat
9. change that results when two or more substances react to create a different substance or substances; the new substances have completely different properties from the original ones
11. 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
14. group 2 elements in the periodic table; their reactivity is not as strong as that of the alkali metals
17. 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)
18. an experiment in which one or more products of a chemical reaction can escape
19. description of a solid that can be stretched into a long wire
20. reaction that takes place when two or more substances react to form new substances
21. measure of atomic mass; 1 amu is equal to 1/12th the mass of a carbon 12 atom
22. of mass principle that matter is not created or destroyed in a chemical reaction; the mass of the products always equals the mass of the reactants
24. pure substance that cannot be broken down into other substances; substance made up of only one type of atom

1. an experiment in which all reactants and all products of a chemical reaction are accounted for
2. a material that electric charge can move through easily
3. description of how a substance interacts with other substances, such as acids;chemical properties are observable only when a chemical change occurs
5. chemical reaction that absorbs energy
8. atom that has become electrically charged because it has lost or gained electrons; a positive ion is an atom that has lost one or more electrons;a negative ion is an atom that has gained one or more electrons
9. combination of symbols that represent a compound; the formula identifies the elements in the compound and the amount of each element
10. group 1 elements in the periodic table, not including hydrogen; the most reactive of the metals
12. chemical reaction that releases energy
13. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
15. number of protons in the nucleus of one atom of an element
16. group 17 elements in the periodic table;the most reactive non-metals
23. invisible negatively charged particle that orbits the nucleus of an atom