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| anything that takes up space and has mass |
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| substance that cannot be broken down to other substances by ordinary chemical means |
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| element essential for life but only in minute quantities |
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| substance consisting of two or more different elements combined |
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| smallest unit of matter that still retains the properties of an element |
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| subatomic particle with positive charge (+) |
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| subatomic particle with negative electrical charge (-) |
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| subatomic particle that is electrically neutral |
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| atom's central core, contains protons and neutrons |
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| particular element has the same unique number of protons |
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| sum of the protons and neutrons in its nucleus |
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| approximately equal to its mass number, the sum of its protons and neutrons |
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| variant form of an atom, have the same number of protons but different number of neutrons |
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| nucleus decays spontaneously giving off particles and energy |
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| electrons occur only at certain energy levels |
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| atoms staying close together, held by attractions |
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| an atom or molecule with an electrical charge resulting from a gain or loss of one or more electrons |
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| 2 ions with opposite charges attract each other, when attraction hold them together this is called: |
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| synonym for ionic compound |
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Definition
| 2 atoms share one or more pairs of outer shell electrons |
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| 2 or more atoms held together by covalent bonds |
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| indicated by a pair of lines |
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| attraction for shared electrons |
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| electrons are shared equally between 2 atoms |
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| unequal sharing of electrons |
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| has an unequal distribution of charges |
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| type of weak chemical bond formed when the partially positive hydrogen atom participating in polar covalent bond in one molecule is attracted to the partially negative atom |
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| molecules sticking together |
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| clinging of one substance to another |
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| measure of how difficult it is to stretch or break the surface of a liquid |
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| amount of energy associated with the movement of atoms and molecules in a body of matter |
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| measures the intensity of heat |
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| a liquid consisting of a uniform mixture of two or more substances |
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| substance that is dissolved |
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| one in which water is the solvent |
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| compound that donates hydrogen ions to solutions |
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| compound that accepts hydrogen ions and removes them from solution |
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| described how acidic or basic a solution is |
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| substances that minimizes changes in pH |
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| refers to rain, snow, or fog with a pH lower than 5.6 |
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| making and breaking of chemical bonds |
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| starting material in a chemical rxn |
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| ending material in a chemical rxn |
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