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capter 2
Question | Answer |
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atom | the basic unit of a chemical element. |
atomic theory | the theory that all matter is made up of tiny indivisible particles (atoms). According to the modern version, the atoms of each element are effectively identical, but differ from those of other elements, and unite to form compounds in fixed proportions. |
solid | firm and stable in shape; not liquid or fluid. " |
liquid | having a consistency like that of water or oil, i.e., flowing freely but of constant volume. |
gas | an airlike fluid substance which expands freely to fill any space available, irrespective of its quantit |
solution | a means of solving a problem or dealing with a difficult situation |
mass | a coherent, typically large body of matter with no definite shape |
weight | a body's relative mass or the quantity of matter contained by it, giving rise to a downward force; the heaviness of a person or thing |
physical change | A physical change is a change in which no new substances are formed. Physical changes affect the form of a chemical substance, but not its chemical composition. Mixtures can be separated into their parts by physical methods |
freezing | below 32°F (0°C). |
melting | make or become liquefied by heat |
chemical change | Chemical change is any change that results in the formation of new chemical substances. At the molecular level, chemical change involves making or breaking of bonds between atoms. These changes are chemical |
law of conservation of mass | The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass |