Page 1 of 52
WGU D425 Introduction to Chemistry, WGU, 2026 –
Complete Questions with 100% Verified Answers
Latest update this year Graded A+
Introduction
This document covers key Introduction to Chemistry topics
including stoichiometry, molarity, acids and bases, chemical
equilibrium, atomic structure, bonding, gas laws, solutions,
and dimensional analysis through question-and-answer
format exercises. It includes calculation-based problems,
definitions, and chemistry concepts designed for
comprehensive course review. The material provides
extensive coverage of chemistry terminology, formulas, and
reaction principles relevant to the WGU D425 curriculum.
,Page 2 of 52
Exam Questions and Answers
92.what is the product of a synthesis reaction btwn potassium
and chloride--- correct precise answer --- KCl
93.what is true about moles--- correct precise answer --- a
mole ratio relates to the amount of any two substances in a
chemical reaction. a mole ratio is a conversion factor btwn
compounds in a chemical reaction. it relates the amounts in
moles of any two substances in a chemical reaction.
94.what common mass used in laboratory setting--- correct
precise answer --- Grams. Grams and kilograms are part of
the metric system and reflect the quantity of matter within a
sample.
95.what mass of hydrogen peroxide must decompose to
produce 48.64g of water?
2H2O2-> O2+ 2H2O
Given 48.64g H2O
Find g H2O2--- correct precise answer --- g H2O -> mol H2O -
> mol H2O2 -> g H2O2
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1. molar mass of H2O 2. mol:mol #. molar mass of H2O2
48.6g H2O (1 mol H2O/18.02g H2O) (2mol H2O2/2mol H2O)
(34.02g H2O2/ 1mol H2O2)=
48.64x1x2x34.03/18.02x2x1= 91.83g H2O2
96.How many molecules of carbon dioxide are required to
react with 174g of carbon monoxide?
2Co+ O2 -> 2CO2
1. g CO -> 2. mol CO2 -> molecules CO2
1. molar mass of CO 2. mol:mol 3. Avogadro's number---
correct precise answer --- 174g CO (1mol CO/28.01g CO) (2
mol CO2/ 2mol CO) (6.022x 10^23 molecules /1 mol CO2)=
3.74x10^24 molecules CO2
97.which would be investigated in reaction stoichiometry---
correct precise answer --- the mass of potassium required to
produce an unknown mass of potassium chloride
98.given the balance equation, how many moles of water H2O
are produced by the complete reaction of 4.0 moles C2H6?
2CH6+ 7O2-> 6H2O+ 4CO2--- correct precise answer ---
99.given the balanced equation how many grams of water
(H2O=18.015g/mol) are produced by the complete reaction of
5.22 moles O2
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2C2H6+ 7O2-> 6H2O + 4CO2--- correct precise answer ---
100.given the balanced equation how many grams of hydrogen
gas
(H2= 2.016 g/mol) are produced by the complete reaction of
489.2 g of hy-drochloric acid (HCL= 36.458 g/mol)
2Na (s) + 2HCl (aq) -> 2NaCl (aq) + H2 (g)--- correct precise
answer ---
101.given the balanced equation how many moles of hydrogen
gas (H2) are produced by the complete reaction of 2.11 x
10^22 atoms of Na
2Na (s) + 2HCl (aq) -> 2NaCl (aq) + H2 (g)--- correct precise
answer ---
102.what happens to a reaction when a limiting reactant in a
chemical reaction is completely used up--- correct precise
answer --- the reaction stops
103.how many moles of potassium chloride are required to
yield 250g of oxygen in the reaction
2KClO3 -> 2KCl+ 3O2--- correct precise answer --- 5.2 mol
convert 250.0 grams to moles:moles=mass/ molar mass,
moles = 250.0/32= 7.81 mol molar ratio btwn KClO3 and O2 is
2:3
WGU D425 Introduction to Chemistry, WGU, 2026 –
Complete Questions with 100% Verified Answers
Latest update this year Graded A+
Introduction
This document covers key Introduction to Chemistry topics
including stoichiometry, molarity, acids and bases, chemical
equilibrium, atomic structure, bonding, gas laws, solutions,
and dimensional analysis through question-and-answer
format exercises. It includes calculation-based problems,
definitions, and chemistry concepts designed for
comprehensive course review. The material provides
extensive coverage of chemistry terminology, formulas, and
reaction principles relevant to the WGU D425 curriculum.
,Page 2 of 52
Exam Questions and Answers
92.what is the product of a synthesis reaction btwn potassium
and chloride--- correct precise answer --- KCl
93.what is true about moles--- correct precise answer --- a
mole ratio relates to the amount of any two substances in a
chemical reaction. a mole ratio is a conversion factor btwn
compounds in a chemical reaction. it relates the amounts in
moles of any two substances in a chemical reaction.
94.what common mass used in laboratory setting--- correct
precise answer --- Grams. Grams and kilograms are part of
the metric system and reflect the quantity of matter within a
sample.
95.what mass of hydrogen peroxide must decompose to
produce 48.64g of water?
2H2O2-> O2+ 2H2O
Given 48.64g H2O
Find g H2O2--- correct precise answer --- g H2O -> mol H2O -
> mol H2O2 -> g H2O2
,Page 3 of 52
1. molar mass of H2O 2. mol:mol #. molar mass of H2O2
48.6g H2O (1 mol H2O/18.02g H2O) (2mol H2O2/2mol H2O)
(34.02g H2O2/ 1mol H2O2)=
48.64x1x2x34.03/18.02x2x1= 91.83g H2O2
96.How many molecules of carbon dioxide are required to
react with 174g of carbon monoxide?
2Co+ O2 -> 2CO2
1. g CO -> 2. mol CO2 -> molecules CO2
1. molar mass of CO 2. mol:mol 3. Avogadro's number---
correct precise answer --- 174g CO (1mol CO/28.01g CO) (2
mol CO2/ 2mol CO) (6.022x 10^23 molecules /1 mol CO2)=
3.74x10^24 molecules CO2
97.which would be investigated in reaction stoichiometry---
correct precise answer --- the mass of potassium required to
produce an unknown mass of potassium chloride
98.given the balance equation, how many moles of water H2O
are produced by the complete reaction of 4.0 moles C2H6?
2CH6+ 7O2-> 6H2O+ 4CO2--- correct precise answer ---
99.given the balanced equation how many grams of water
(H2O=18.015g/mol) are produced by the complete reaction of
5.22 moles O2
, Page 4 of 52
2C2H6+ 7O2-> 6H2O + 4CO2--- correct precise answer ---
100.given the balanced equation how many grams of hydrogen
gas
(H2= 2.016 g/mol) are produced by the complete reaction of
489.2 g of hy-drochloric acid (HCL= 36.458 g/mol)
2Na (s) + 2HCl (aq) -> 2NaCl (aq) + H2 (g)--- correct precise
answer ---
101.given the balanced equation how many moles of hydrogen
gas (H2) are produced by the complete reaction of 2.11 x
10^22 atoms of Na
2Na (s) + 2HCl (aq) -> 2NaCl (aq) + H2 (g)--- correct precise
answer ---
102.what happens to a reaction when a limiting reactant in a
chemical reaction is completely used up--- correct precise
answer --- the reaction stops
103.how many moles of potassium chloride are required to
yield 250g of oxygen in the reaction
2KClO3 -> 2KCl+ 3O2--- correct precise answer --- 5.2 mol
convert 250.0 grams to moles:moles=mass/ molar mass,
moles = 250.0/32= 7.81 mol molar ratio btwn KClO3 and O2 is
2:3
