CHEM 120 UNIT 2 Exam Questions and Correct
Answers| Latest 2025
Describe the organization of the periodic table. - ✔✔groups are vertical, periods are
horizontal, measured by metals, transition metals, nonmetals, and metalloids
State the octet rule. - ✔✔atoms will gain, lose, or share electrons in order to achieve
8
ionic compound - ✔✔metal to nonmetal
TRANSITION metals named one way(using roman numerals) - ✔✔Cr2+ = chromium
(II) ion
Cr3+= chromium (III) ion
naming ionic compounds - ✔✔listing cation name first followed by anion name
BaS= barium sulfide
AlF3= aluminum flouride
K2S= potassium sulfide
anions are - ✔✔negative ions, they are named by replacing the ending of the
element with -ide followed by the word ion
Br-1=bromide ion
O2-=oxide ion
S2- = sulfide ion
, ionic compounds page 10 - ✔✔
covalent bonds - ✔✔sharing of electrons to give each atom an octet, nonmetal to
nonmetal, DO NOT SIMPLIFY
polyatomic ions - ✔✔charged particles containing 2 or more covalently bonded
atoms
A substance is made of small brown particles and small white particles. When poured
into water, the substance separates - the brown particles sink and the white particles
float. The original substance would be considered a(n) - ✔✔mixture
An unknown substance Z can be broken down to substances X and Y by running an
electric current through it. Substance Z is - ✔✔compound
Which of the following is an example of a homogeneous mixture? - ✔✔salt water
Which of the following elements has the symbol P? - ✔✔phosphorus
Which of the following elements would be classified as a nonmetal? - ✔✔F (#9)
The element in group I and period 3 is: - ✔✔Na (#11)
Which of the following elements would be classified as an alkali metal? - ✔✔K (#19)
Which of the following elements would be classified as a representative element? -
✔✔both K (#19) and Ar (#18) are representative elements
Answers| Latest 2025
Describe the organization of the periodic table. - ✔✔groups are vertical, periods are
horizontal, measured by metals, transition metals, nonmetals, and metalloids
State the octet rule. - ✔✔atoms will gain, lose, or share electrons in order to achieve
8
ionic compound - ✔✔metal to nonmetal
TRANSITION metals named one way(using roman numerals) - ✔✔Cr2+ = chromium
(II) ion
Cr3+= chromium (III) ion
naming ionic compounds - ✔✔listing cation name first followed by anion name
BaS= barium sulfide
AlF3= aluminum flouride
K2S= potassium sulfide
anions are - ✔✔negative ions, they are named by replacing the ending of the
element with -ide followed by the word ion
Br-1=bromide ion
O2-=oxide ion
S2- = sulfide ion
, ionic compounds page 10 - ✔✔
covalent bonds - ✔✔sharing of electrons to give each atom an octet, nonmetal to
nonmetal, DO NOT SIMPLIFY
polyatomic ions - ✔✔charged particles containing 2 or more covalently bonded
atoms
A substance is made of small brown particles and small white particles. When poured
into water, the substance separates - the brown particles sink and the white particles
float. The original substance would be considered a(n) - ✔✔mixture
An unknown substance Z can be broken down to substances X and Y by running an
electric current through it. Substance Z is - ✔✔compound
Which of the following is an example of a homogeneous mixture? - ✔✔salt water
Which of the following elements has the symbol P? - ✔✔phosphorus
Which of the following elements would be classified as a nonmetal? - ✔✔F (#9)
The element in group I and period 3 is: - ✔✔Na (#11)
Which of the following elements would be classified as an alkali metal? - ✔✔K (#19)
Which of the following elements would be classified as a representative element? -
✔✔both K (#19) and Ar (#18) are representative elements
