| A | B |
|---|
| accuracy | How closely a measured value agrees with a standard or correct value |
| chemical change | A change in which one or more new substances are formed. |
| compound | A substance composed of two or more elements that are chemically combined in fixed proportions. |
| density | Mass per unit volume |
| element | A substance that cannot be decomposed into simpler substances by chemical means. |
| endothermic | Describes processes that absorb heat energy. |
| energy | The capacity to do work or transfer eneregy. |
| exothermic | Describes processes that release heat energy. |
| extensive property | A property that depends on the amount of material in a sample. |
| heat | A form of energy that flows between two objects because of their difference in temperature. |
| specific heat | The amount of heat necessary to raise the temperature of 1 gram of substance 1 degree Celsius. |
| heterogeneous mixture | A mixture that does not have uniform composition and properties throughout. |
| homogeneous mixture | Mixture that has uniform composition and properties throughout. |
| intensive property | A property that is independent of the amount of material in a sample. |
| kinetic energy | Energy matter posses by virtue of its motion. |
| Law of Conservation of Energy | Energy can be neither created nor destroyed it can only change forms. |
| Law of Conservation of Matter | Matter can be neither created nor destroyed in a chemical reaction. |
| Law of Definite Proportions | A compound always contains the same elements in the same proportion. |
| mass | A measure of the amount of matter in an object. |
| matter | Anything that has mass and occupies space. |
| mixture | Matter with variable composition. |
| physical change | A change of state with no new substances being formed. |
| potential energy | The energy a body possesses by virtue of its position. |
| significant figures or digits | Digits that indicate the precision of measurements. |
| substance | Matter that has a definite composition. |
| symbol | A letter or group of letters that represent an element. |
| weight | The measure of the gravitational attraction of the earth for a body. |
