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30 Cards in this Set
- Front
- Back
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matter
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anything that has mass
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element
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a substance that cannot be broken down
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compound
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two or more elements in a fixed ratio
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atom
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the smallest unit of matter
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proton
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a subamic particle with a single positive eletrical charge
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electron
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subtance prartickle with a single negative charge
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nuetron
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electrically nuetral particle found in a nucleus of an atom
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nucleus
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an atoms central core
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atomic number
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the number of protons in each atoms of a praticular element
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mass number
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the sum of the number of protons and nuetrons in an atoms nucleus
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isotope
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variant form of an atom
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radioactive isotope
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an isotope whose nucleus decays spontaneuously giving off partcles of energy
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ion
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atom or molecule that has gained or lost one or more electrons
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ionic bond
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an attraction between two ions with opposite changes holds the ions together
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covalent bonds
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an attraction between atoms that share one or more pairs of outer shell electrons symbolized
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molecule
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a group of two or more atoms held together by a covalent bonds
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nonpolar covalent bond
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an attraction between two atoms that share one or more pairs of electrons equally
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polar covalent bond
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an attraction between atoms that share electrons
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polar molecule
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a molecule containg polar covalent bonds
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hydrogen bond
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a type of weak chemical
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cohesion
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the attraction between different molecules of the same kind
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solution
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a liquid consisting of a homegenous mixture of two or more substance consisting of a dissolving agent called the solvent and a substances
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acid
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a substance that increases the hydrogen ion concentration in a solution
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base
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a substance that decreases the hydrogen ion concentration in a solution
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pH scale
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a mesure of the relative acidity of a soluiton ranging in value 0-14
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chemical reaction
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a process leading to changes in the compostion of matter involves the makeing and or breaking of chemical bonds
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reactant
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a starting material in a chemical reaction
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product
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an ending material in a chemical reaction
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adhesion
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the attraction between different kinds of molecules
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solvent
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the dissolving agent in a solution
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