Composition of matter

8. plays many crucial roles in the body, such as supporting muscle and nerve function and energy production
9. a man-made radioactive metal that is solid under normal conditions found in smoke alarms
10. a heterogeneous mixture in which the solute particles do not dissolve
11. strong as steel but much less dense
13. a gaseous, liquid or solid mixture that has the same proportions of its components throughout a given sample
14. Effect. scattering of a beam of light by a medium containing small suspended particles
15. a substance formed from two or more elements chemically joined (bonded) together
17. A substance that cannot be broken down into simpler substances by chemical means
18. a mixture in which the composition is not uniform throughout the mixture

1. properties such as density, color, hardness, melting and boiling points, and electrical conductivity
2. the most abundant metallic element in Earth's crust and the most widely used nonferrous metal
3. a particle of matter
4. Matter can be classified into two broad categories: pure substances and mixtures
5. properties such as flammability and susceptibility to corrosion
6. a chemical element with the symbol Si and atomic number 14
7. particles can be seen by the naked eye at 100 micron
10. physical material from which something is made
12. A mixture in which very small particles of one substance are distributed evenly throughout another substance
16. a substance made by combining other substances together