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34 Cards in this Set
- Front
- Back
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matter |
anything that has mass and occupies space |
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chemistry |
the study of the properties of matter and how matter changes |
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substance |
a single kind of matter that is pure and has a specific set of properties |
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physical property |
a characteristic of a pure substance that can be observed without changing it into another substance |
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chemical property |
a characteristic of a pure substance that describes its ability to change into a different substance |
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element |
a pure substance that cannot be brokendown into other substances by chemical or physical means |
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atom |
the basic particle from which all elements are made |
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chemical bond |
the force that holds two atoms together |
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molecule |
a particle made of two or more atoms bonded together |
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compound |
a pure substance made of two or more elements chemically combined |
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chemical formula |
a formula that gives the elements in a compound and the ratio of atoms |
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mixture |
two or more substances that are mixed together but not chemically combined |
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heterogeneous mixture |
a mixture in which pure substances are unevenly distributed throughout the mixture |
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homogeneous mixture |
a mixture in which substsances are evenly distributed throughout the mixture |
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solution |
an example of a homogeneous mixture; forms when substances dissolve |
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weight |
a measure of the force of gravity on an object |
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mass |
a measure of how much matter is in an object |
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International System of Units |
the system of units used by scientists to measure the properties of matter |
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volume |
the amount of space that matter occupies |
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density |
the measurement of how much mass of a substance is contained in a given volume |
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physical change |
a change in a substance that does not change its identity |
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chemical change |
a change in one or more substances cobine or break apart to form new substances |
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law of conversion of mass |
the principle that the total amount of matter is neither crested nor destroyed during any chemical or physical change |
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energy |
the ability to do work or cause change |
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temperature |
a measure of the average energy of motion of the particles of a substance |
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thermal energy |
the total energy of all the particles of an object |
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endothermic change |
a change in which energy is taken in |
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exothermic change |
a change in which energy is given off |
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kinetic energy |
the energy of matter in motion |
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potential energy |
the energy an object has because of its position; also the internal stored energy of an object, such as energy stored in chemical bonds |
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chemical energy |
a form of potential energy that is stored in chemical bonds between atoms |
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electromagnetic energy |
a form of energy that travels through space as waves |
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electrical energy |
the energy of electrically charged particles moving from one place to another |
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electrode |
a metal strip that conducts electricity |
