 | Term | Definition |
| |
valence electrons |
electrons in outer energy levels |
| |
noble gases |
stable |
| |
stable |
need eight valence electrions to be |
| |
ionic bond |
transfer of electrons froma metal to a nonmetal |
| |
covalent bond |
sharing of electrons between nonmetals |
| |
molecule |
smallest part of a covalent bond with the same properties |
| |
chemical energy |
energy formed in a chemical bond |
| |
diatomi molecule |
made of two atoms of the same element (always covalent) H2, N2, O2 |
| |
oxidation number |
charge on an ion when an atom has a gained or lost electrons |
| |
structual formula |
shows the sharing of electrons in covalent bonds |
| |
physical change |
any change in matter tht does not change the chemical properties of the matter |
| |
ion |
smallest part of an ionic bond |
| |
chemical formula |
tells numb |
| |
chemical reation |
process in which a chemical reaction occues occurs reatants yeild products |
| |
physical property |
color and sutff |
| |
chemical property |
IDK |
| |
chemical equation |
desription of cheical reaction sing chemical formulas |
| |
chemical change |
occurs when a substance changes composition by frming one or more new substances |
| |
reactants |
on the left side of the yeild (arrow) |
| |
products |
on the right side of the yeild (arrow) |
| |
synthesis reaction |
combine substance to form compunds, A+B>AB |
| |
decomposition |
break down a compound into simpler subtances AB>A+B |
| |
single replacement |
a hree element replaces a different element of a compound. A+BC>AC+B |
| |
double replacement |
part of one compound changes places with apart of another compound. AB+CD>CB+AD |
| |
combustion reaction |
a compound and oxygen burn. CxHy+O2>CO2+H2O |
| |
perciptate |
new solid from original liquid or new liquid from original gas |
| |
exothermic reaction |
reaction that gives off energy |
| |
endothermic |
reation that requires energy in order to take place |
| |
polyatomic ion |
group of atoms that covalently bonded to form an ion (because unstable) |
| |
subscripts |
indicates number of atoms of an element in a compound |
| |
coefficient |
same as subscript but written in front of molecule |
| |
dry ice |
frozen dry ice |
| |
sublimation |
goes froma solid directly to gas |
| |
catalyst |
speeds up |
| |
Hoffman apparatus |
decomposed water |
| |
activation energy |
energy needed to start chemical reaction |
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