WGU D425 INTRODUCTION TO
CHEMISTRY -PA AND OA ACTUAL
EXAM(2026) 100%VERIFIED |COMPLETE
QUESTIONS AND ANSWERS | GRADED
A+.
Question 1
What is chemistry?
A. The study of living organisms
B. The study of matter and its interactions
C. The study of energy and motion
D. The study of Earth's structure
Correct Answer: B
Rationale: Chemistry is the study of matter (anything that has mass and takes up
space) and its interactions, including composition, properties, and transformations.
Question 2
What is matter?
A. Anything that has mass and takes up physical space
B. Anything that can be seen
C. Anything that has energy
D. Anything that can be measured
,Correct Answer: A
Rationale: Matter is anything that has mass and takes up physical space. It is
everywhere around us and is composed of atoms.
Question 3
What is an atom?
A. A subatomic particle with a positive charge
B. The smallest unit of matter that retains chemical properties
C. A group of molecules bonded together
D. A type of chemical bond
Correct Answer: B
Rationale: Matter is composed of atoms, which are the smallest units of matter
that retain their chemical properties.
Question 4
How is matter classified?
A. Living and non-living
B. Pure substances and mixtures
C. Organic and inorganic
D. Solid and liquid
Correct Answer: B
,Rationale: Matter is classified into two broad categories: pure substances
(elements and compounds) and mixtures (homogeneous and heterogeneous).
Question 5
What is a pure substance?
A. A substance with variable composition
B. A substance with fixed composition and distinct properties
C. A mixture of two or more elements
D. Any substance found in nature
Correct Answer: B
Rationale: Pure substances have a fixed composition and distinct chemical
properties. Examples include elements and compounds.
Question 6
What is an element?
A. A pure substance made of two or more atom types
B. A pure substance made of one type of atom
C. A mixture of different atoms
D. A compound of different elements
Correct Answer: B
Rationale: An element is a pure substance composed of one type of atom. It
cannot be broken down chemically. There are 118 known elements.
, Question 7
What is a compound?
A. A pure substance of two or more elements chemically bonded
B. A mixture of elements physically combined
C. A single element
D. A solution of different substances
Correct Answer: A
Rationale: A compound is a pure substance composed of two or more elements
chemically bonded in a fixed ratio, such as H₂O.
Question 8
What is a mixture?
A. Two or more substances chemically bonded
B. Two or more substances physically combined in variable ratios
C. A single pure substance
D. A compound with fixed composition
Correct Answer: B
Rationale: A mixture consists of two or more substances physically combined in
variable ratios. Mixtures can be separated by physical means.
CHEMISTRY -PA AND OA ACTUAL
EXAM(2026) 100%VERIFIED |COMPLETE
QUESTIONS AND ANSWERS | GRADED
A+.
Question 1
What is chemistry?
A. The study of living organisms
B. The study of matter and its interactions
C. The study of energy and motion
D. The study of Earth's structure
Correct Answer: B
Rationale: Chemistry is the study of matter (anything that has mass and takes up
space) and its interactions, including composition, properties, and transformations.
Question 2
What is matter?
A. Anything that has mass and takes up physical space
B. Anything that can be seen
C. Anything that has energy
D. Anything that can be measured
,Correct Answer: A
Rationale: Matter is anything that has mass and takes up physical space. It is
everywhere around us and is composed of atoms.
Question 3
What is an atom?
A. A subatomic particle with a positive charge
B. The smallest unit of matter that retains chemical properties
C. A group of molecules bonded together
D. A type of chemical bond
Correct Answer: B
Rationale: Matter is composed of atoms, which are the smallest units of matter
that retain their chemical properties.
Question 4
How is matter classified?
A. Living and non-living
B. Pure substances and mixtures
C. Organic and inorganic
D. Solid and liquid
Correct Answer: B
,Rationale: Matter is classified into two broad categories: pure substances
(elements and compounds) and mixtures (homogeneous and heterogeneous).
Question 5
What is a pure substance?
A. A substance with variable composition
B. A substance with fixed composition and distinct properties
C. A mixture of two or more elements
D. Any substance found in nature
Correct Answer: B
Rationale: Pure substances have a fixed composition and distinct chemical
properties. Examples include elements and compounds.
Question 6
What is an element?
A. A pure substance made of two or more atom types
B. A pure substance made of one type of atom
C. A mixture of different atoms
D. A compound of different elements
Correct Answer: B
Rationale: An element is a pure substance composed of one type of atom. It
cannot be broken down chemically. There are 118 known elements.
, Question 7
What is a compound?
A. A pure substance of two or more elements chemically bonded
B. A mixture of elements physically combined
C. A single element
D. A solution of different substances
Correct Answer: A
Rationale: A compound is a pure substance composed of two or more elements
chemically bonded in a fixed ratio, such as H₂O.
Question 8
What is a mixture?
A. Two or more substances chemically bonded
B. Two or more substances physically combined in variable ratios
C. A single pure substance
D. A compound with fixed composition
Correct Answer: B
Rationale: A mixture consists of two or more substances physically combined in
variable ratios. Mixtures can be separated by physical means.
