P R O F E S S I O N A L P R A C T I C E M AT E R I A L S
EPA 608 Core Certification
Exam Questions & Answers
2026/2027 Exam-Ready
Edition (Rationales)
Verified Answers Exam Ready With Rationales 56 QUESTIONS
DOCUMENT OVERVIEW
This document provides 56 EPA 608 Core Certification exam-ready questions with pre-
filled correct answers and detailed rationales for HVAC/R professionals. It covers
fundamental refrigerant knowledge and system principles essential for environmental
compliance. This resource is ideal for study, review, and comprehensive preparation for the
EPA 608 Core certification exam.
TOPICS
Refrigerant Properties & Classifications Q1–Q24
Refrigerant Handling & Regulations Q25–Q44
System Components & Operation Q45–Q47
Ozone Depletion & Environmental Impact Q48–Q56
Page 1
, E XA M Q U EST I O N S
Q1 QUESTION 1 OF 56
Which of the following refrigerant has a GWP of "1"?
A) R-22
B) R-1233zd
C) R-410A
D) R-134a
ANSWER
B) R-1233zd
RATIONALE
Refrigerants are classified by their Global Warming Potential (GWP), a measure of their contribution
to global warming. A GWP of "1" indicates a baseline value, typically associated with refrigerants
that have minimal or no direct impact on global warming relative to other substances. This specific
classification is critical for environmental regulations and refrigerant selection.
Q2 QUESTION 2 OF 56
The molecule found in CFCs and HCFCs that depletes O-Zone is:
A) Fluorine
B) Chlorine
C) Hydrogen
D) Carbon
ANSWER
B) Chlorine
RATIONALE
The stratospheric ozone layer is depleted by specific atoms that are released from refrigerants.
When CFCs and HCFCs break down in the upper atmosphere, the atom that catalyzes the
destruction of ozone molecules is released. This catalytic atom is responsible for a chain reaction
that breaks apart ozone.
Page 2
, Q3 QUESTION 3 OF 56
An ozone molecule contains;
A) Four oxygen atoms
B) Three oxygen atoms
C) Two oxygen atoms
D) One oxygen atom
ANSWER
B) Three oxygen atoms.
RATIONALE
Ozone is an allotrope of oxygen, meaning it is a form of oxygen with a different molecular structure
than diatomic oxygen (O₂). This specific allotrope consists of three oxygen atoms bonded together.
Therefore, an ozone molecule is chemically represented as O₃.
Q4 QUESTION 4 OF 56
HCFCs contain;
A) hydrogen, fluorine, and olefin
B) hydrogen, chlorine, fluorine, and carbon
C) chlorine, fluorine, and carbon
D) hydrogen, fluorine, and carbon
ANSWER
B) hydrogen, chlorine, fluorine, and carbon.
RATIONALE
Hydrochlorofluorocarbons (HCFCs) are a class of refrigerants whose chemical composition
includes hydrogen, chlorine, fluorine, and carbon atoms. This molecular structure distinguishes
them from other refrigerant groups, such as CFCs which lack hydrogen.
Page 3
EPA 608 Core Certification
Exam Questions & Answers
2026/2027 Exam-Ready
Edition (Rationales)
Verified Answers Exam Ready With Rationales 56 QUESTIONS
DOCUMENT OVERVIEW
This document provides 56 EPA 608 Core Certification exam-ready questions with pre-
filled correct answers and detailed rationales for HVAC/R professionals. It covers
fundamental refrigerant knowledge and system principles essential for environmental
compliance. This resource is ideal for study, review, and comprehensive preparation for the
EPA 608 Core certification exam.
TOPICS
Refrigerant Properties & Classifications Q1–Q24
Refrigerant Handling & Regulations Q25–Q44
System Components & Operation Q45–Q47
Ozone Depletion & Environmental Impact Q48–Q56
Page 1
, E XA M Q U EST I O N S
Q1 QUESTION 1 OF 56
Which of the following refrigerant has a GWP of "1"?
A) R-22
B) R-1233zd
C) R-410A
D) R-134a
ANSWER
B) R-1233zd
RATIONALE
Refrigerants are classified by their Global Warming Potential (GWP), a measure of their contribution
to global warming. A GWP of "1" indicates a baseline value, typically associated with refrigerants
that have minimal or no direct impact on global warming relative to other substances. This specific
classification is critical for environmental regulations and refrigerant selection.
Q2 QUESTION 2 OF 56
The molecule found in CFCs and HCFCs that depletes O-Zone is:
A) Fluorine
B) Chlorine
C) Hydrogen
D) Carbon
ANSWER
B) Chlorine
RATIONALE
The stratospheric ozone layer is depleted by specific atoms that are released from refrigerants.
When CFCs and HCFCs break down in the upper atmosphere, the atom that catalyzes the
destruction of ozone molecules is released. This catalytic atom is responsible for a chain reaction
that breaks apart ozone.
Page 2
, Q3 QUESTION 3 OF 56
An ozone molecule contains;
A) Four oxygen atoms
B) Three oxygen atoms
C) Two oxygen atoms
D) One oxygen atom
ANSWER
B) Three oxygen atoms.
RATIONALE
Ozone is an allotrope of oxygen, meaning it is a form of oxygen with a different molecular structure
than diatomic oxygen (O₂). This specific allotrope consists of three oxygen atoms bonded together.
Therefore, an ozone molecule is chemically represented as O₃.
Q4 QUESTION 4 OF 56
HCFCs contain;
A) hydrogen, fluorine, and olefin
B) hydrogen, chlorine, fluorine, and carbon
C) chlorine, fluorine, and carbon
D) hydrogen, fluorine, and carbon
ANSWER
B) hydrogen, chlorine, fluorine, and carbon.
RATIONALE
Hydrochlorofluorocarbons (HCFCs) are a class of refrigerants whose chemical composition
includes hydrogen, chlorine, fluorine, and carbon atoms. This molecular structure distinguishes
them from other refrigerant groups, such as CFCs which lack hydrogen.
Page 3
