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a sample of matter, either a single element or a compound, that has definate chemical and physical properties
a substance that cannot be separated or broken down into into simpler substances by chemcial means; all atoms of an element have the same atomic number
The smallest unit of a substance that keeps all the physical and chemical properties of that substance; it can consist of one atom or two or more atoms bonded toether
A change that occurs when one or more substances change into entirely new substances with different properties
laws of conservation of energy
The law that states that energy cannot be created or destroyed but can be changed from one form to another.
The energy transferred between objects that are at different temperatures; energy is always transferred from higher-temperature objects to lower-temperature objects until thermal equilibrium is reached
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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