Chm 101
Description: Exam 1 (Part two)
Complete list of Terms and Definitions for Chm 101
| Terms | Definitions |
|---|---|
| density | mass per unit volume; m/v |
| graduated cylinder | instrument to find volume |
| mass | amt of matter in a substance |
| triple beam balance | instrument to find mass |
| unit for volume of solids | cubic cm |
| unit for volume of liquids | ml; L |
| volume | how much space something takes up in the universe |
| volume of a box | L x W x H |
| Formula to find density | Remember triangle with Mass at top |
| Pure substance | Matter with a definite composition. Element composed of one type of atom. A compound composed of 2 or more elements combined in definite ratio. |
| Element | cannot be divided further--smallest part is atom. |
| Element example: | Copper |
| Compounds | contain 2 or more elements in definite ratio. |
| Compound example: | Salt (NaCl) (sodium + chlorine) |
| Mixture | 2 or more substances physically mixed, not chemically combined. Can be separated by physical methods. |
| Mixture example: | pasta and water |
| Homogeneous mixtures | Composition is uniform throughout. Diff parts of mixture are not visible. (Ex.: sugar water) |
| Heterogeneous mixtures | composition of substances is not uniform. Comp varies from one part to another. (Visible). Ex: peach pie |
| physical properties | those characteristics of a substance that can chg w/o changing identity of substance. |
| physical change | substances undergo a _______ when it's shape, size, or state changes but the type of substance itself does not change. |
| chemical properties | characteristics of substance that change when a new substance is producted. |
| states of matter are: | solid, liquid, gas |
| Changes of state: | melting, freezing, boiling, condensing. |
| mass # | # of protons & neutrons in nucleus of atom |
| isotope | atom of element that has diff # of neutrons than another atom of same element |
| atomic # | # of protons in an atom |
| group | vertical column on periodic table in which elements have similar properties |
| Period | horizontal row of elements |