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