| A | B |
|---|
| matter | Anything that has mass and occupies space. |
| chemistry | The study of the properties of matter and how matter changes. |
| substance | A single kind of matter that is purre and has a specific set of properties. |
| physical property | A characteristic of a pure substance that can be observed without changing it into another substance. |
| chemical property | A characteristic of a pure substance that describes its ability to change into a different substance. |
| element | A pure substance that cannot be broken down into other substances by chemical or physical means. |
| atom | The basic particle from which all elements are made. |
| chemical bond | The force that holds atoms together. |
| molecule | A neutral particle made of two or more atoms joined by covalent bonds. |
| compound | A pure substance made of two or more elements chemically combined. |
| chemical formula | A combination of symbols that represents the elements in a compound and their proportions. |
| mixture | Two or more substances that are mixed together but not chemically combined. |
| heterogeneous mixture | A mixture in which pure substances are unevenly distributed throughoutt the mixture. |
| homogeneous mixture | A mixture in which substance are evenly distributed throughout the mixture. |
| solution | A well-mixed mixture containing a solvent and at least one solute that has the same properties throughout. |
| weight | A measure of the force of gravity on an object. |
| mass | A measure of how much matter is in an object. |
| International System of Units | (SI) the system of units used by scientists to measure the properties of matter. |
| volume | The amount of space that matter occupies. |
| density | The ratio of the mass of a substance to its volume. |
| physical change | change in a substance that does not change its identity |
| chemical change | change in which one or more substances combine or break apart to form new substances |
| law of conservation of mass | the total amount of matter is neither created nor destroyed during any chemical or physical change |
| energy | ability to do work or cause change |
| temperature | measure of the average energy of motion of the particles of a substance |
| thermal energy | total energy of all the particles of an object |
| endothermic change | change in which energy is taken in |
| exothermic change | change in which energy is given off |
| kinetic energy | energy of matter in motion |
| potential energy | energy an object has because of its position |
| chemical energy | form of potential energy that is stored in chemical bonds between atoms |
| electromagnetic energy | form of energy that travels through space as waves |
| electrical energy | energy of electrically charged particles moving from one place to another |
| electrode | metal strip that conducts electricity |
