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| the scientific study of the composition, structure, and properties of matter and the changes that matter undergoes |
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| any substance that has a defined composition |
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| a measure of the amount of matter in an object |
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| anything that has mass and volume |
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| the smallest unit of an element that maintains the chemical properties of that element |
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| a substance that cannot be separated or broken down into simpler substances by chemical means; all atoms of an element have the same atomic number |
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| a substance made up of atoms of two or more different elements joined by chemical bonds |
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| property that depends on the extent or size of a system |
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| a property that does not depend on the amount of matter present, such as pressure, temperature, or density |
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| a change of matter from one form to another without a change in chemical properties |
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| the change of a substance from one physical state to another |
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| the state of matter in which the volume and shape of a substance are fixed |
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| the state of matter that has a definite volume but not a definite shape |
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| a form of matter that does not have a definite volume or shape |
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| in physical science, a state of matter that starts as a gas and then becomes ionized; it consists of free moving ions and electrons, it takes on an electric charge, and its properties differ from those of a solid liquid, or gas |
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| a property of matter that describes a substance’s ability to participate in chemical reactions |
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| a change that occurs when one or more substances change into entirely new substances with different properties |
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| the process by which one or more substances change to produce one or more different substances |
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| a substance or molecule that participates in a chemical reaction |
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| a vertical column of elements in the periodic table; elements in a group share chemical properties |
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| A vertical column of the periodic table |
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| in chemistry, a horizontal row of elements in the periodic table |
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| an element that is shiny and that conducts heat and electricity well |
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| an element that conducts heat and electricity poorly and does not form positive ions in an electrolytic solution |
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| an element that has properties of both metals and nonmetals; sometimes referred to as a semiconductor |
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| a characteristic of a substance that does not involve a chemical change, such as density, color or hardness |
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