Question | Answer |
mixture | a combination of two or more pure substances in which each substance retains its own identity |
homogeneous | uniform composition, well mixed |
heterogeneous | nonuniform composition, random placement |
pure substance | substance that has only one component |
gas | particles widely spread, no definite shape or value |
liquid | particles closer together, definite volume but no shape |
solid | particles very close together, definite volume and shape |
error | difference between the true value and estimation (random and systematic) |
accuracy | degree of agreement between the value and measured value |
precision | measure of the agreement and replica measurements |
mass | quantity of matter in an object |
temperature | degree of "hotness" of an object |
energy | the ability to do work and accomplish change (kinetic and potential) |
intensive | not dependent on amount (density and color) |
extensive | dependent on amount (mass and volume) |
element | on the periodic table |
compound | distilled water |
mixture | air |
chemistry | the study of matter |
properties | characteristics of matter |
data | individual results of a single measurement |
physical property | observed without changing composition or identity of a substance |
physical change | a recognizable difference in appearance without changing composition |
chemical property | result in a change in the composition and can be observed by a chemical reaction |
chemical change | process in rearranging, removing, replacing, or adding atoms to produce a new substance |
Celsius to Fahrenheit | F-32 / 1.8 |
Fahrenheit to Celsius | 1.8 (C) + 32 |