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| a physical blend of 2 omore components |
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| a substance formed in a chem react |
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| part of a sample having uniform comp and prop |
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| starting subs in a chemical react |
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| gaseous state of substance that is a liquid or solid at room temp |
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| amt of matter an obj contains |
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| desc. mixture w/ a uniform comp |
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| subs that cannot be changed into simpler subs. by chem. means |
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| composed of 2 or more subs. chemically comb. in a fixed proportion |
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| process in which subs are changed into diff subs. |
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| quantity of matter an obj contains |
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| smallest part. of an elem that retains the prop of that element |
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| atoms w/ same # protons but diff #s of neutrons in the nucleus |
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| total # of protons and neut in the nucleus |
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| 1/12 the mass of a carbon atom having 6 protons and 6 neutrons |
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| Heisenburg Uncertainty Principle |
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| states the impossibility of knowing both velocity and position of a moving particle at the same time |
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| Pauli exclusion principle |
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| each orbital has at most 2 electrons |
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| tendency of electrons to enter orbitals of lowest energy first |
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| frequencies of light emitted by an element |
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| discrete bundle of electromagnetic energy |
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| energy needed to move an electron from 1 energy level to another |
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| separation of light into different wavelengths |
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| ability of an atom to attract electrons when the atom is in a comopound |
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| energy required to remove an electron from an atom |
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| 1/2 the dist b/w nuclei of 2 atoms when the atoms are joined |
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| type of element characterized by presence of electrons in d orbital |
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| a repetition of properties occurs when elements are arranged in order of increasing atomic number |
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| cosists of a single atom w/ a + or - charge |
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| produces a hydrogen ion when dissolved in water |
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| law of definite proportions |
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| in any chemical compound, the masses of elements are always in the sam proportion by mass |
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| law of multiple proportions |
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| when 2 elem form more than 1 compound, the masse of 1 element that comb w/ the same mass of the other element are in the ratio of small, whole numbers |
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| compound composed of 2 different elements |
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| tightly-bound group of atoms that behaves as a unit and carries a net charge |
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| volume occupied by a mole of any gas at STP |
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| mass of a mole of any element or compound |
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| a chem. equation tat does not indicate relative amounts of reactants and products |
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| temp at which the vapor pressure of a liquid is equal to the external pressure |
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| temp at which vapor pressure of a liquid is = to 1 atmosphere |
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| temp at which solid turns to a liquid |
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