Chemistry Vocabulary

3. gases in group 18 of the periodic table; almost nonreactive (already stable)
5. A chemical change in which a substance combines with oxygen, as when iron oxidizes, forming rust
7. The amount of space something occupies
10. matter made up of two or more substances that are not joined chemically
11. a characteristic of a substance that can be observed directly (what you see, what you feel, what you smell) or can be measured with a tool without changing the identity of the substance
12. Horizontal row on the Periodic Table
14. the ability to dissolve in another substance
16. smallest particle of an element
17. electrons on the outermost energy level of an atom
18. an element in group 1 of the periodic table; most reactive metal
19. simple substances that cannot be broken down into simpler substances
20. a pure substance that forms when two or more elements join chemically in a fixed proportion

1. a characteristic of a substance that cannot be observed without changing the identity of the substance
2. the ability of a material to allow either heat or electricity to flow through it
4. a mixture in which substances are evenly distributed; example: a solution, milk, sugar water
6. matter that has the same chemical composition throughout and cannot be separated into its parts by physical means; examples: elements and compounds
8. another name for homogeneous mixtures
9. A solid that is produced as a result of a chemical reaction in solution
13. the ability of a substance to be hammered or beaten into thin sheets
15. a mixture in which substances are not distributed evenly; example: a salad, pepperoni pizza, dirt