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| Any substance that has a defined composition |
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| The process by which one or more substances change to produce one or more different substances |
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| The physical forms of matter, which are solid, liquid, gas, and plasma |
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| A substance or molecule that participates in a chemical reaction |
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| A substance that forms in a chemical reaction |
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| Anything that has mass and takes up space |
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| A measure of the size of a body or region in three-dimensional space |
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| A measure of the amount of matter in an object; a fundamental property of an object that is not affected by the forces that act on the object, such as the gravitational force |
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| A measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe |
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| Something that has magnitude, size, or amount |
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| A quantity adopted as a standard of measurement |
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| A ratio that is derived from the equality of two different units that can be used to convert from one unit to the other |
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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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| The ratio of the mass of a substance to the volume of the substance; oftem expressed as grams per cubic centimeter for solids and liquids and as grams per liter for gases |
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| A property of matter that describes a substance's ability to participate in chemical reactions |
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| The smallest unit of an element that maintains the properties of that element |
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| A sample of a matter, either a single element or a single compound, that has definite chemical and physical properties |
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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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| The smallest unit of a substance that keeps all of the physical and chemical properties of that substance; it can consist of one atom or two or more atoms bonded together |
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| A substance made up of atoms of two or more different elements joined by chemical bonds |
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| A combination of two or more substances that are not chemically combined |
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| Describes something that has a uniform structure or composition throughout |
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| Composed of dissimilar components |
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| A change of matter from one form to another without a change in chemical properties |
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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 change of a substance from a liquid to a gas |
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| Describes a process in which heat is absorbed from the environment |
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| Describes a process in which a system releases heat into the environment |
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| Law of Conservation of Energy |
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| The law that states that energy cannot be created or destroyed but can be changed from one form to another |
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| The energy transferred between objects that are at different temperatures; energy is always transferred from high-temperature objects to lower-temperature objects until thermal equilibrium is reached |
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| The energy of an object that is due to the object's motion |
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| A measure of how hot (or cold) something is; specifically, a measure of the average kinetic energy of the particles in an object |
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| The quantity of heat required to raise a unit mass of homogeneous material 1 K or 1 C in a specified way given constant pressure and volume |
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| A series of steps followed to solve problems, including collecting data, formulating hyopothesis, testing the hypothesis, and stating conclusions |
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| A theory or explanation that is based on observation and that can be tested |
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| An explanation for some Phenomenon that is based on observation, experimentation, and reasoning |
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| A summary of many experimental results and observations; a law tells how things work |
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| Law of Conservation of Mass |
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| The law that states that mass cannot be created or destroyed in ordinary chemical and physical changes |
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| A description of how close a measurement is to the true value of the quantity measured |
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| The exactness of a measurement |
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| A prescribed decimal place that determines the amount of rounding off to be done on the precision of the measurement |
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