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Definition
| Average or (weighted) mean of masses of all isotopes of an element; relative to (one atom of) C-12 |
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Definition
| The sum of the relative atomic masses of the constituent atoms of a molecule |
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Definition
| A formula showing the lowest whole number ratio of atoms in a compound |
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Definition
| A chemical formula of a molecular compound that shows the types and numbers of atoms present in a molecule of a compound (but not the structure) |
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Definition
| Substance that is dissolved |
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Definition
| A liquid substance capable of dissolving other substances |
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Definition
| A homogeneous mixture of two or more substances |
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Definition
| The sum of the number of neutrons and protons in an atomic nucleus |
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Term
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Definition
| The number of protons in the nucleus of an atom |
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Definition
| A spectrum of light in which there are no gaps, so that each region blends directly into the next |
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Definition
| A spectrum showing only certain discrete wavelengths/lines. on a black background |
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Definition
| A vertical column of the periodic table |
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Definition
| A horizontal row of the periodic table |
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Definition
| The amount of energy required to remove one mole of electrons from one mole of atoms in the gaseous state |
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Term
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Definition
| The (minimum) energy required/needed for the removal of one electron; from a gaseous atom |
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Definition
| A reaction that releases heat energy to the surroundings ΔH=- |
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Term
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Definition
| A reaction that absorbs heat energy from the surroundings ΔH=+ |
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Term
| Standard enthalpy change of reaction |
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Definition
| The difference between the enthalpy of the products and the enthalpy of the reactants under standard conditions represented ΔH |
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Term
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Definition
| The energy change required to break 1 mol of bonds or form 1 mol of bonds between two covalently bonded atoms in the gaseous state |
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Term
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Definition
| Energy for the conversion of a gaseous molecule into (gaseous) atoms; (average values) obtained from a number of similar bonds/compounds |
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Term
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Definition
| Atom of same element/same number of protons but with different mass number/number of neutrons |
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