Chem 120 Final Exam Questions With Complete Solutions

molecular mass (molecular weight) correct answer: the sum of the atomic masses, in atomic mass units, of all the atoms in the formula of a compound empirical formula correct answer: a chemical formula showing the ratio of elements in a compound rather than the total number of atoms Avogadro's number (Mole) correct answer: 6.02 x 10^23 proton correct answer: A subatomic particle that has a positive charge and that is found in the nucleus of an atom neutron correct answer: A subatomic particle that has no charge and that is found in the nucleus of an atom electron correct answer: A subatomic particle that has a negative charge and orbits the nucleus valence electron correct answer: an electron that is found in the outermost shell of an atom mole ratio correct answer: a conversion factor that relates the amounts in moles of any two substances involved in a chemical reaction ion correct answer: An atom or group of atoms that has a positive or negative charge. anion correct answer: A negatively charged ion column 7 makes -1 ions column 6 makes -2 ions column 5 makes -3 ions cation correct answer: A positively charged ion column 1 (except Hydrogen) makes +1 ions column 2 makes +2 ions monatomic ion correct answer: an ion formed from a single atom polyatomic ion correct answer: an ion made of two or more atoms; invisible units that carry a charge