CHEM 120 FINAL EXAM QUESTIONS | TESTED AND PROVEN ANSWERS | LATEST UPDATE 2024/2025 100% (GRADE A+)

CHEM 120 FINAL EXAM QUESTIONS | TESTED AND
PROVEN ANSWERS | LATEST UPDATE 2024/2025
100% (GRADE A+)
molecular mass (molecular weight)


Ans>> the sum of the atomic masses, in atomic mass units, of all the atoms in the formula of a

compound




empirical formula


Ans>> a chemical formula showing the ratio of elements in a compound rather than the total

number of atoms




Avogadro's number (Mole)


Ans>> 6.02 x 10^23




proton


Ans>> A subatomic particle that has a positive charge and that is found in the nucleus of an

atom




1

,neutron


Ans>> A subatomic particle that has no charge and that is found in the nucleus of an atom




electron


Ans>> A subatomic particle that has a negative charge and orbits the nucleus




valence electron


Ans>> an electron that is found in the outermost shell of an atom




mole ratio


Ans>> a conversion factor that relates the amounts in moles of any two substances involved in a

chemical reaction




ion


Ans>> An atom or group of atoms that has a positive or negative charge.




anion


2

, Ans>> A negatively charged ion


column 7 makes -1 ions


column 6 makes -2 ions


column 5 makes -3 ions




cation


Ans>> A positively charged ion


column 1 (except Hydrogen) makes +1 ions


column 2 makes +2 ions




monatomic ion


Ans>> an ion formed from a single atom




polyatomic ion


Ans>> an ion made of two or more atoms; invisible units that carry a charge




spectator ion

3