WGU D425 EXAM STUDY GUIDE
EXAMS SET COMPLETE QUESTIONS
AND ANSWERS 2026 VIEW AHEAD
EXAM.
⫸ Common non-metal ions. Answer: Understanding charges of group
15, group 16, group 17 elements
⫸ VSEPR shapes. Answer: Shapes of molecules based on Valence
Shell Electron Pair Repulsion theory
⫸ Linear. Answer: 180 degrees
⫸ trigonal planar. Answer: 120 degrees, 3 bonds
⫸ Tetrahedral. Answer: 109.5 degrees, 4 bonds
⫸ Trigonalbipyramidal. Answer: 5 atoms bonded to central atom, 0
lone pairs
⫸ Octahedral. Answer: 90 degrees, 6 bonds, 0 lone pairs
⫸ Avogadro's number. Answer: Number of atoms or molecules in one
mole of a substance: 6.02 x 10^23
, ⫸ Periodic Trends. Answer: Patterns in properties of elements on the
periodic table
⫸ Ideal Gas Law. Answer: PV = nRT; pressure x volume = moles x
gas constant x temperature
⫸ Percent yield. Answer: Efficiency of a chemical reaction expressed
as a percentage
percent yield= actual yield/theoretical yield *100
⫸ pH. Answer: Measure of hydrogen ion concentration in a solution
pH=-log[H+]
⫸ pOH. Answer: Measure of hydroxide ion concentration in a
solution
pOH=-log[OH-]
⫸ Solubility Rules. Answer: Guidelines determining solubility of
compounds in water
⫸ solubility rules. Answer: Chlorates, Acetates, Sulfates, Halogens,
Nitrates, Group IA
EXAMS SET COMPLETE QUESTIONS
AND ANSWERS 2026 VIEW AHEAD
EXAM.
⫸ Common non-metal ions. Answer: Understanding charges of group
15, group 16, group 17 elements
⫸ VSEPR shapes. Answer: Shapes of molecules based on Valence
Shell Electron Pair Repulsion theory
⫸ Linear. Answer: 180 degrees
⫸ trigonal planar. Answer: 120 degrees, 3 bonds
⫸ Tetrahedral. Answer: 109.5 degrees, 4 bonds
⫸ Trigonalbipyramidal. Answer: 5 atoms bonded to central atom, 0
lone pairs
⫸ Octahedral. Answer: 90 degrees, 6 bonds, 0 lone pairs
⫸ Avogadro's number. Answer: Number of atoms or molecules in one
mole of a substance: 6.02 x 10^23
, ⫸ Periodic Trends. Answer: Patterns in properties of elements on the
periodic table
⫸ Ideal Gas Law. Answer: PV = nRT; pressure x volume = moles x
gas constant x temperature
⫸ Percent yield. Answer: Efficiency of a chemical reaction expressed
as a percentage
percent yield= actual yield/theoretical yield *100
⫸ pH. Answer: Measure of hydrogen ion concentration in a solution
pH=-log[H+]
⫸ pOH. Answer: Measure of hydroxide ion concentration in a
solution
pOH=-log[OH-]
⫸ Solubility Rules. Answer: Guidelines determining solubility of
compounds in water
⫸ solubility rules. Answer: Chlorates, Acetates, Sulfates, Halogens,
Nitrates, Group IA
