Chem 100 exam 2 la tech eddy exam questions with 100% correct answers

chemical bonds - correct answers compounds are composed of atoms held together by ______ _______. this is the result of electrostatic attraction between atoms. 2 types: covalent and ionic ionic bonds - correct answers -an electrostatic attraction between ions of opposite charge -metal + nonmetal -metal loses electrons and the nonmetal gains electrons covalent bonds - correct answers -an electrostatic attraction between two or more atoms that are sharing electrons -nonmetal + nonmetal -nuclei are understood to "share" the bonding electrons molecule - correct answers a group of 2+ atoms held together in a definite spatial arrangement by covalent bonds. the electrons are shared between the atoms. only composed of nonmetals chemical formula - correct answers a representation of the composition of a chemical compound in terms of the symbols of the constituent elements subscripts - correct answers the relative number of the atoms of the elements in a chemical formula molecular formula - correct answers the actual number of atoms in a molecule represented by a whole number ratio empirical formula - correct answers the simplest formula that can be written for a compound from the molecular formula structural formula - correct answers a chemical formula that shows how atoms are bonded to each other atomic elements - correct answers occur in nature as monatomic (single atom) substances. ex: helium molecular elements - correct answers exist as molecules composed of 2+ elements (ex. diatomic chlorine, Cl2, or triatomic oxygen, O3, P4, and S8) molecular compounds - correct answers are composed of 2+ different nonmetals ionic compounds - correct answers composed of ions; metal + nonmetal; also called ionic solids or sometimes salts formula unit - correct answers the basic unit polyatomic ion - correct answers an electrically charged collection of 2+ covalently bonded atoms binary molecule - correct answers compound of only 2 nonmetals noble gases - correct answers hydrogen forms binary compounds with all of the nonmetals except the _____ ______. acid - correct answers a compound which will increase the hydrogen ion concentration when dissolved in water. can be divided into two types: binary & oxyacids binary acids - correct answers contain hydrogen and a nonmetal oxyacids - correct answers contain hydrogen and an oxyanion formula mass (molar mass) - correct answers the sum of the atomic weights of the atoms in a molecule of the substance chemical equation - correct answers a shorthand description of a chemical reaction using symbols and formulas to represent the elements and compounds involved coefficients - correct answers the numbers placed in front of formulas in a chemical equation to balance the equation, thereby indicating the combining ratios of reactants and products stoichiometry - correct answers the relationship that describes the relation between the masses of reactants and products cation - correct answers metal anion - correct answers nonmetal hydrogen fluoride - correct answers HF(g) hydrogen chloride - correct answers HCl(g) hydrogen iodide - correct answers HI(g) hydrogen sulfide - correct answers H2S(g) methane - correct answers CH4 ammonia - correct answers NH3 nitrogen monoxide - correct answers NO dinitrogen monoxide - correct answers N2O ammonium nitrate - correct answers NH4NO3 sodium carbonate - correct answers Na2CO3 nickel(II) perchlorate - correct answers Ni(ClO4)2 cobalt(II) phosphate - correct answers Co3(PO4)2 calcium sulfate hemihydrate - correct answers CaSO4 .