HN A + P
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| What is an element? | a unique substance that can't be broken down
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| What is an atom? | More-or-less identical building blocks for each element
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| What is an atomic symbol? | 1 or 2 letter chemical shorthand for each element
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| What is unique to each element? | physical and chemical properties
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| What is a physical property? | those detected with our senses
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| What is a chemical property? | pertain to the way atoms interact with one another
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| What are major elements of the human body? | oxygen, carbon, hydrogen, and nitrogen
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| What percent of lesser elements make up the body? | 3.9%
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| What are the lesser elements? | Ca, P, K, Na, Cl, Mg, I, and Fe
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| What percent of trace elements make up the body? | 0.01 %
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| What is a trace element? | elements required in little amounts and found in part of enzymes
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| What is a nucleus? | consists of neutrons and protons
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| What is a neutron? | has no charge and a mass of 1 amu
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| What is a proton? | have pos. charge and mass of 1 amu
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| What is a electron? | found orbitting nucleus and has a neg. charge and 0 amu
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| What is a planetary model? | model in which electrons move around a nucleus in which electrons move around nucleus in fixed, circular orbits
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| What is a orbital model? | model in which regions around nucleus in which electrons are most likely to be found
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| What is an atomic #? | equal to number of protons
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| What is a mass #? | equal to the mass of protons and neutrons
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| What is an atomic height? | average of mass # of all isotopes
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| What is a nucleus? | consists of neutrons and protons
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| What is a neutron? | have no charge and a mass of 1 amu
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| What is a proton? | has pos. charge and mass of 1 amu
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| What is an electron? | orbits the nucleus and has a neg. charge and mass of 0 amu
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| What is a planetary model? | model in which electrons move around nucleus in fixed, circular orbits
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| What is an orbital model? | model in which regions around nucleus in which electrons are most likely to be found
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| What is an atomic #? | equal to # of protons
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| What is a mass #? | equal to mass of protons and neutrons
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| What is an atomic weight? | average of mass # of all isotopes
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| What is an isotope? | atoms with same number of protons but diff number of neutrons
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| What is a radioisotope? | atoms that undergo spontaneous decay
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| What is a radioactivity? | spontaneous decay of atoms
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| What is a molecule? | 2 or more atoms held together by chem bonds
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| What is a compound? | 2 or more diff kinds of atoms chem bonds together
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| What is a mixture? | 2 or more compounds physically intermixed(not chem bond)
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| What is a solution? | homogenous mixtures of components
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| What is a solvent? | substance present in greatest amount
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| What is a solute? | substance present in smaller amounts
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| What is percent? | parts per 100 parts
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| What is molarity? | moles per liter
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| What is a mole? | atomic or molecular weight (sum of atomic weight) in grams
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| What is a colloid? | heterogeneous mixtures whose solutes don't settle out
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| What is a suspension? | heterogeneous mixture with nisible solutes that tend to settle out
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| What is a mixture? | can be homogeneous or heterogeneous
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| What are all compounds? | homogenous only
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| What is an electron shell/energy level? | surround nucleus of an atom
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| What is a bond? | formed using electrons in outermost energy level
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| What is a valence shell? | outermost energy level containing chem active electrons
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| What is the octect rule? | execept for the 1st shell, atoms interact in manner to have 8 electrons in their valence shell
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| What is an inert element? | hav outermost energy level fully occupied by electrons
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| What is a reactive element? | doesn't have their outermost eenergy level occupied by electrons
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