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6.6C, 6.6E
Periodic Table & Chemical Reactions
| Term | Definition |
|---|---|
| Periodic Table of Elements | an organized table of all the chemical elements in order of increasing atomic number |
| Physical Property | properties of matter that can be observed, measured, or changed without changing the matter itself |
| Rare Earth Elements | a group of similar metals that are hard to find in pure form and are located in the middle of the periodic table |
| Atoms | the smallest unit of each element |
| Brittle | a material that easily breaks, cracks, or snaps |
| Ductility | can be made into wires, pulled, or stretched without breaking |
| Dull | not shiny |
| Element | a pure substance composed of the same type of atom throughout |
| Luster | gentle shining light that is reflected from a surface, shiny |
| Malleability | a physical property of an object allowing it to be reshaped with bending or cracking |
| Metal(s) | elements that are mostly solids at room temperature, have luster, and are good conductors of heat and electricity |
| Metalloid | elements whose physical properties are intermediate between metals and nonmetals |
| Molecule | a group of two or more atoms bonded together |
| Nonmetal | elements that are mostly liquids and gases at room temperature and bad conductors of heat and electricity |
| Conductivity | ability of a substance to transfer heat or electrical energy |
| Chemical change | a type of change that forms a new substance |
| Chemical properties | characteristics of substances that are changing their chemical identity |
| Chemical reactions | a process where one or more substances change into entirely new substances |
| Corrosion | the natural, gradual breakdown of materials-usually metals-through chemical or electrochemical reactions with their environment |
| Precipitate | a solid that forms when two liquids are mixed |
| Thermal energy | heat energy |
| Tarnishing | a thin layer of chemical corrosion that discolors or dulls the outer surface of a metal |
| Evidence of a Chemical Change | Precipitate, Gas production, Color change, Smoke/fire, Temperature change |
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