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| A logical or natural association between two or more things |
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| the degree of closeness of a measured or calculated quantity to its actual (true) value |
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| are standards for measurement of physical quantities that need clear definitions to be useful |
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| any aspect of an object or substance that can be measured or perceived without changing its identity |
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| is a method of investigating causal relationships among variables |
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| a sufficiently stable, electrically neutral group of at least two atoms in a definite arrangement held together by very strong (covalent) chemical bonds.[ |
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| chemical formula that shows the number and kinds of atoms in a molecule |
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| a substance with a high heat of fusion which, melting and solidifying at a certain temperature, is capable of storing and releasing large amounts of energy |
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| may be described as a chemical reaction[1] or a means of writing out and describing such a phenomenon |
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| is an abbreviation or shortened version of the name of a chemical element, generally assigned in relation to its Latin name |
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| kkinetic and potential energy |
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| energy stored within a physical system |
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| an atom or molecule where the total number of electrons is not equal to the total number of protons, giving it a net positive or negative electrical charge. |
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| the quality of occurring at regular intervals or periods (in time or space) and can occur in different contexts |
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| a branch of physics that studies the elementary constituents of matter and radiation, and the interactions between them |
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| are any of the different types of atoms (nuclides) of the same chemical element, each having a different atomic mass (mass number) |
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