WGU D425 INTRODUCTION TO CHEMISTRY
OA ACTUAL EXAM PAPER 2026 QUESTIONS
WITH ANSWERS GRADED A+
• Actual Yield.
Answer: The actual amount of product obtained from a reaction.
• Spectator Ions.
Answer: Ions that do not participate in chemical reactions.
• Reducing Agent.
Answer: Substance being oxidized (donates electrons).
• given the balanced equation how many grams of water (H2O=18.015g/mol)
are produced by the complete reaction of 5.22 moles O2 2C2H6+ 7O2->
6H2O + 4CO2.
Answer: given the balanced equation how many grams of water
(H2O=18.015g/mol) are produced by the complete reaction of 5.22 moles
O2 2C2H6+ 7O2-> 6H2O + 4CO2
• Dimensional Analysis Ex. how many centimeters are there in 3.55m
quantity given: 3.55m 3.55m * (100cm/1m)=.
Answer: 3.55m=355cm
• Molar Mass.
Answer: The mass of one mole of a pure substance, in g/mol. g/mol (1:1
ratio with atomic mass).
• what happens to a reaction when a limiting reactant in a chemical reaction is
completely used up.
Answer: the reaction stops
• Dilution.
Answer: Adding solvent to decrease solute concentration.
• What is the definition of an intensive property.
, Answer: A property that depends on the type of matter, not the amount.
• What is the definition of chemical property.
Answer: The ability of a substabce to undergo a specific chemical change.
• what does concentration measure.
Answer: how much substance is mixed with another substance.
concentration measures the amount of solute dissolved in a given amount of
solution
• what is the correct name for Cl2O7.
Answer: Dichlorine heptoxide
• Reduction.
Answer: Gain of electrons; decrease in oxidation state.
• the mass of a ball is 141kg. what is its mass in ounces, given 1 oz= 28.35g.
Answer: 4.97x10^3 oz.
• Electrons (e-).
Answer: Negative charge, contribute least to the mass of the atom, orbit the
nucleus.
• Energy.
Answer: The ability to do work.
• Alkene.
Answer: Carbon-carbon double bond.
• Supersaturated Solution.
Answer: Concentration of solute exceeds solubility limits (often achieved by
cooling a hot saturated solution slowly).
• naming ionic compounds.
Answer: metal (positive ion) comes first, then negative ion (one syllable +
ide)
• What characterizes an unsaturated solution.
Answer: a solution that contains less than the maximum amount of solute
OA ACTUAL EXAM PAPER 2026 QUESTIONS
WITH ANSWERS GRADED A+
• Actual Yield.
Answer: The actual amount of product obtained from a reaction.
• Spectator Ions.
Answer: Ions that do not participate in chemical reactions.
• Reducing Agent.
Answer: Substance being oxidized (donates electrons).
• given the balanced equation how many grams of water (H2O=18.015g/mol)
are produced by the complete reaction of 5.22 moles O2 2C2H6+ 7O2->
6H2O + 4CO2.
Answer: given the balanced equation how many grams of water
(H2O=18.015g/mol) are produced by the complete reaction of 5.22 moles
O2 2C2H6+ 7O2-> 6H2O + 4CO2
• Dimensional Analysis Ex. how many centimeters are there in 3.55m
quantity given: 3.55m 3.55m * (100cm/1m)=.
Answer: 3.55m=355cm
• Molar Mass.
Answer: The mass of one mole of a pure substance, in g/mol. g/mol (1:1
ratio with atomic mass).
• what happens to a reaction when a limiting reactant in a chemical reaction is
completely used up.
Answer: the reaction stops
• Dilution.
Answer: Adding solvent to decrease solute concentration.
• What is the definition of an intensive property.
, Answer: A property that depends on the type of matter, not the amount.
• What is the definition of chemical property.
Answer: The ability of a substabce to undergo a specific chemical change.
• what does concentration measure.
Answer: how much substance is mixed with another substance.
concentration measures the amount of solute dissolved in a given amount of
solution
• what is the correct name for Cl2O7.
Answer: Dichlorine heptoxide
• Reduction.
Answer: Gain of electrons; decrease in oxidation state.
• the mass of a ball is 141kg. what is its mass in ounces, given 1 oz= 28.35g.
Answer: 4.97x10^3 oz.
• Electrons (e-).
Answer: Negative charge, contribute least to the mass of the atom, orbit the
nucleus.
• Energy.
Answer: The ability to do work.
• Alkene.
Answer: Carbon-carbon double bond.
• Supersaturated Solution.
Answer: Concentration of solute exceeds solubility limits (often achieved by
cooling a hot saturated solution slowly).
• naming ionic compounds.
Answer: metal (positive ion) comes first, then negative ion (one syllable +
ide)
• What characterizes an unsaturated solution.
Answer: a solution that contains less than the maximum amount of solute
