| A | B |
|---|
| accuracy | closeness of a measurement to the actual value |
| chemical change | a change that results in the formation of a new substance |
| chemical property | the ability of a substance to undergo chemical reactions and to form new substances |
| pure compound | a substance that can be separated into simpler substances (elements) only by chemical means |
| density | the ratio of the mass of an object to its volume |
| pure element | a substance than cannot be changed into a simpler substance under normal laboratory conditions |
| extensive property | property that is dependant of the amount of substance present |
| heterogenous mixture | a mixture that is not uniform in its composition |
| homogeneous mixture | a mixture that is completely uniform in its composition |
| intensive property | property that is independant of the amount of substance present |
| mixture | a combination of two or more substances that are not chemically combined |
| physical change | the alteration of a substance that does not affect its chemical composition |
| physical property | quality of a substance that can be observed without changing the substance's chemical composition |
| precision | describes the closeness, or reproducibility, of measurements |
| significant figure | all the digits that can be known precisely in a measurement plus one estimated digit |
| Law of conservation of mass | matter can neither be created not destroyed and it is followed in chemical reactions. |
| Law of conservation of energy | Energy can neither be created nor destroyed. Energy is finite in the universe. |
| atom | smallest particle of matter |
| molecule | made up of two or more atoms |
| filtration | method of separating liquid from solid by a filtering through a paper |
| distillation | method for separating two liquids by evaporation and condensation. |
| chromatography | Method of separation for dye or color pigments |
| measured value | value obtained by experimentation |
| accepted value | value obtained from a known source or literature |
| uncertatinty | last digit in a measurement that is predicted by an observer |
| scientific notation | numbers are written in the form M × 10n, where the factor M is a number greater than or equal to 1 but less than 10, and n is a whole number. |
| factor label method / Dimensional analysis | a mathematical technique that allows you to use units to solve problems involving measurements. |
