CHEM 219 Modules 1–8 Exams &
Final Exam – Principles of Organic
Chemistry (2026/2027) | Portage
Learning – Verified Q&A
1. What is the definition of resonance in the context of molecular chemistry?
A phenomenon where electrons are shared equally between atoms.
A concept describing the delocalization of electrons in molecules.
A type of chemical bond formed between two atoms.
A method for calculating molecular weights.
2. What is the SI prefix that represents a factor of 10^3?
Milli-
Centi-
Kilo-
Mega-
3. Given the element magnesium (Mg) with a +2 charge, what would be the
correct way to write its ion symbol, and how would this affect its behavior
in a chemical reaction?
Mg2+; it will act as a reducing agent.
Mg2+; it will act as an oxidizing agent.
Mg; it will not participate in reactions.
Mg2+; it will bond with two anions.
,4. A chemical reaction occurs in a beaker, resulting in a temperature drop.
Based on this observation, what type of process is likely taking place, and
what implications does this have for the surrounding environment?
An endothermic process is occurring, which will cool the
surrounding environment.
, An exothermic process is occurring, which will cool the
surrounding environment.
An endothermic process is occurring, which will heat the
surrounding environment.
An exothermic process is occurring, which will heat the surrounding
environment.
5. You can determine the number and types of atoms in a molecule using
the periodic table.
the molecular formula.
the Internet.
6. What is the general formula for writing the dissociation equation of sodium
chloride (NaCl) in water?
NaCl(s) → Na⁺(aq) + Cl⁻(aq)
NaCl(aq) → Na⁺(s) + Cl⁻(s)
NaCl(s) + H₂O(l) → Na⁺(aq) + Cl⁻(aq)
NaCl(aq) + H₂O(l) → Na⁺(aq) + Cl⁻(aq)
7. Predict the name of the ionic compound that forms from strontium and
oxygen
strontium oxide
strontium peroxide
strontium hydroxide
strontium monoxide
8. What is the primary effect of temperature on the solubility of substances in
water?
, It decreases solubility
It has no effect
It increases solubility
It varies randomly
9. Given the elements sodium (Na) and chlorine (Cl), how would the octet
rule predict their interaction in forming a compound?
Sodium will share its electrons with chlorine to form a covalent
bond.
Chlorine will lose an electron to sodium to achieve a full outer shell.
Sodium will lose one electron to achieve a stable configuration,
while chlorine will gain that electron.
Both sodium and chlorine will remain as individual atoms without
bonding.
10. If you were to mix hydrochloric acid (HCl) with sodium hydroxide (NaOH),
what type of chemical reaction would occur, and what would be the
expected products?
Synthesis reaction producing sodium chloride and water
Decomposition reaction producing hydrogen gas and chlorine gas
Double replacement reaction producing sodium chloride and
water
Single replacement reaction producing sodium and hydrochloric
acid
11. Explain why the pressure of 1 atm is commonly expressed in both torr and
mmHg. What is the relationship between these two units?
They are completely different units with no relation.
They are equivalent, as 1 torr equals 1 mmHg.
Final Exam – Principles of Organic
Chemistry (2026/2027) | Portage
Learning – Verified Q&A
1. What is the definition of resonance in the context of molecular chemistry?
A phenomenon where electrons are shared equally between atoms.
A concept describing the delocalization of electrons in molecules.
A type of chemical bond formed between two atoms.
A method for calculating molecular weights.
2. What is the SI prefix that represents a factor of 10^3?
Milli-
Centi-
Kilo-
Mega-
3. Given the element magnesium (Mg) with a +2 charge, what would be the
correct way to write its ion symbol, and how would this affect its behavior
in a chemical reaction?
Mg2+; it will act as a reducing agent.
Mg2+; it will act as an oxidizing agent.
Mg; it will not participate in reactions.
Mg2+; it will bond with two anions.
,4. A chemical reaction occurs in a beaker, resulting in a temperature drop.
Based on this observation, what type of process is likely taking place, and
what implications does this have for the surrounding environment?
An endothermic process is occurring, which will cool the
surrounding environment.
, An exothermic process is occurring, which will cool the
surrounding environment.
An endothermic process is occurring, which will heat the
surrounding environment.
An exothermic process is occurring, which will heat the surrounding
environment.
5. You can determine the number and types of atoms in a molecule using
the periodic table.
the molecular formula.
the Internet.
6. What is the general formula for writing the dissociation equation of sodium
chloride (NaCl) in water?
NaCl(s) → Na⁺(aq) + Cl⁻(aq)
NaCl(aq) → Na⁺(s) + Cl⁻(s)
NaCl(s) + H₂O(l) → Na⁺(aq) + Cl⁻(aq)
NaCl(aq) + H₂O(l) → Na⁺(aq) + Cl⁻(aq)
7. Predict the name of the ionic compound that forms from strontium and
oxygen
strontium oxide
strontium peroxide
strontium hydroxide
strontium monoxide
8. What is the primary effect of temperature on the solubility of substances in
water?
, It decreases solubility
It has no effect
It increases solubility
It varies randomly
9. Given the elements sodium (Na) and chlorine (Cl), how would the octet
rule predict their interaction in forming a compound?
Sodium will share its electrons with chlorine to form a covalent
bond.
Chlorine will lose an electron to sodium to achieve a full outer shell.
Sodium will lose one electron to achieve a stable configuration,
while chlorine will gain that electron.
Both sodium and chlorine will remain as individual atoms without
bonding.
10. If you were to mix hydrochloric acid (HCl) with sodium hydroxide (NaOH),
what type of chemical reaction would occur, and what would be the
expected products?
Synthesis reaction producing sodium chloride and water
Decomposition reaction producing hydrogen gas and chlorine gas
Double replacement reaction producing sodium chloride and
water
Single replacement reaction producing sodium and hydrochloric
acid
11. Explain why the pressure of 1 atm is commonly expressed in both torr and
mmHg. What is the relationship between these two units?
They are completely different units with no relation.
They are equivalent, as 1 torr equals 1 mmHg.
