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molecule in which 2 or more kinds of atoms are present
substances containing heteroatomic molecules must be compounds
ex/ H2O |
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molecule in which all atoms present are of the same kind
substances containing homoatomic molecules must be elements
ex/ O2 |
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| groups of 2 or more atoms that functions as a unit because the atoms are tightly bound together |
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| smallest particle of an element that can exist and still have the properties of the element |
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| a pure substance that can be broken into 2 or more simpler pure substances by chemical means |
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a pure substance that cannot be broken down into simpler pure substances by chemical means such as a chemical reaction, an electrical current, heat, or a beam of light
ex/ gold, silverr, copper |
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| contains visibly different phases (parts), each of which has different properties |
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| contains only 1 visibly distinct phase (part) which has uniform properties throughout |
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a single kind of matter that cannot be separated into other kinds of matter by any physical means
ex/ water, carbon dioxide |
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a physical combination of 2 or more pure substances in which each substance retains its own chemical identity
ex/ salt water |
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a preocess in which a substance undergoes a change in chemical composition
involves conversion of the material into 1 or more new substances |
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process in which a substance changes its physical appearance but not its chemical composition
a new substance is never formed as a result of a physical change |
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| characteristic of a substance that descfribes the way the substance undergoes or resists change to form a new substance |
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characteristics of a substance that can be observed without changing the basic identity of the substance
ex/ color, odor, physical state, melting point, boiling point, hardness |
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distinguishing characteristic of a substance that is used in its identification and description
each substance has a unique set of properties that distinguishes it from all other substances
2 general types: physical & chemical |
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| a measure of the total quatity of matter in an object |
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| anything that has mass and takes up space |
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| field of study concerned with the characteristics, composition, and transformation of matter |
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