WGU D425 STUDY GUIDE REVIEW SET TEST
PAPER Q&A 2026 VIEW AHEAD
ASSESSMENT.
⫸ % by Volume. Answer: Volume percentage of a component in a
solution
formula: mL of part/mL of whole * 100
= mL of solute/mL of solute + solution *100
⫸ % by mass/volume. Answer: Mass percentage of a solute in a
volume of solution
Formula: g of solute/mL of whole *100
⫸ Molarity. Answer: Concentration of a solution in moles of solute
per liter of solution
mole of solute/total volume of solute+ mL of solvent
⫸ Dilution Formula. Answer: C1V1 = C2V2; initial concentration x
initial volume = final concentration x final volume
⫸ Metric prefixes. Answer: Units used to indicate multiples or
fractions of base units in the metric system
⫸ Density. Answer: Mass per unit volume of a substance
, Density=Mass/Volume
⫸ Average atomic mass. Answer: Weighted average mass of isotopes
of an element
sum of all values(atomic mass of isootope * decimal abundance)
⫸ Classes of chemical reactions. Answer: Categories of reactions:
synthesis, decomposition, single replacement, double replacement,
combustion, redox
⫸ Synthesis reaction. Answer: a reaction in which two or more
substances combine to form a new compound
⫸ Decomposition Reaction. Answer: AB --> A + B
A single compound breaks down into two or more simpler substances
⫸ Single Replacement. Answer: A + BC --> B + AC
one element replaces another element in a compound
⫸ Double Replacement. Answer: AB + CD --> AD + CB
a chemical reaction where two elements in different compounds trade
places
PAPER Q&A 2026 VIEW AHEAD
ASSESSMENT.
⫸ % by Volume. Answer: Volume percentage of a component in a
solution
formula: mL of part/mL of whole * 100
= mL of solute/mL of solute + solution *100
⫸ % by mass/volume. Answer: Mass percentage of a solute in a
volume of solution
Formula: g of solute/mL of whole *100
⫸ Molarity. Answer: Concentration of a solution in moles of solute
per liter of solution
mole of solute/total volume of solute+ mL of solvent
⫸ Dilution Formula. Answer: C1V1 = C2V2; initial concentration x
initial volume = final concentration x final volume
⫸ Metric prefixes. Answer: Units used to indicate multiples or
fractions of base units in the metric system
⫸ Density. Answer: Mass per unit volume of a substance
, Density=Mass/Volume
⫸ Average atomic mass. Answer: Weighted average mass of isotopes
of an element
sum of all values(atomic mass of isootope * decimal abundance)
⫸ Classes of chemical reactions. Answer: Categories of reactions:
synthesis, decomposition, single replacement, double replacement,
combustion, redox
⫸ Synthesis reaction. Answer: a reaction in which two or more
substances combine to form a new compound
⫸ Decomposition Reaction. Answer: AB --> A + B
A single compound breaks down into two or more simpler substances
⫸ Single Replacement. Answer: A + BC --> B + AC
one element replaces another element in a compound
⫸ Double Replacement. Answer: AB + CD --> AD + CB
a chemical reaction where two elements in different compounds trade
places
