Exam portage learning chem 103 general chemistry i module 7 exam 2026
updated edition with 100% verified answers
Portage Learning CHEM 103 General Chemistry I Module 7 Exam
2026 Updated Edition | 180 Practice Questions with Answers, Rationales, and
Multiple Choice
SECTION 1: THERMOCHEMISTRY FUNDAMENTALS (Questions 1-30)
QUESTION 1
Where does 90% of the energy we use originally come from?
A) Fossil fuels
B) The sun
C) Nuclear reactions
D) Geothermal energy
Correct Answer: B) The sun
Rationale: Approximately 90% of the energy we use ultimately originates from the
sun. Solar energy is captured through photosynthesis by plants and bacteria,
forming the basis of the food chain and fossil fuel formation .
QUESTION 2
,Plants and many bacteria capture solar energy through what process?
A) Cellular respiration
B) Photosynthesis
C) Fermentation
D) Chemosynthesis
Correct Answer: B) Photosynthesis
Rationale: Photosynthesis is the process by which plants, algae, and some
bacteria capture solar energy and convert it into chemical energy stored in
glucose and other organic molecules .
QUESTION 3
What is thermochemistry?
A) The study of temperature changes in chemical reactions
B) The amount of heat absorbed or released during chemical and physical changes
C) The study of thermodynamics in biological systems
D) The measurement of chemical reaction rates
,Correct Answer: B) The amount of heat absorbed or released during chemical and
physical changes
Rationale: Thermochemistry is specifically defined as the amount of heat
absorbed or released during chemical and physical changes .
QUESTION 4
The law of conservation of energy states that:
A) Energy can be created and destroyed in chemical reactions
B) Energy can be converted from one form to another but cannot be created or
destroyed
C) Energy is only conserved in chemical reactions
D) Heat is the only form of energy
Correct Answer: B) Energy can be converted from one form to another but cannot
be created or destroyed
Rationale: The law of conservation of energy (first law of thermodynamics) states
that energy cannot be created or destroyed, only converted from one form to
another .
, QUESTION 5
What is the SI unit of energy?
A) Calorie (cal)
B) Joule (J)
C) Kelvin (K)
D) Watt (W)
Correct Answer: B) Joule (J)
Rationale: The joule (J) is the SI unit of energy. The calorie is also a unit of energy
but is not the SI unit .
QUESTION 6
One calorie is equal to how many joules?
A) 1.000 J
B) 4.184 J
C) 4.184 kJ
D) 0.239 J
updated edition with 100% verified answers
Portage Learning CHEM 103 General Chemistry I Module 7 Exam
2026 Updated Edition | 180 Practice Questions with Answers, Rationales, and
Multiple Choice
SECTION 1: THERMOCHEMISTRY FUNDAMENTALS (Questions 1-30)
QUESTION 1
Where does 90% of the energy we use originally come from?
A) Fossil fuels
B) The sun
C) Nuclear reactions
D) Geothermal energy
Correct Answer: B) The sun
Rationale: Approximately 90% of the energy we use ultimately originates from the
sun. Solar energy is captured through photosynthesis by plants and bacteria,
forming the basis of the food chain and fossil fuel formation .
QUESTION 2
,Plants and many bacteria capture solar energy through what process?
A) Cellular respiration
B) Photosynthesis
C) Fermentation
D) Chemosynthesis
Correct Answer: B) Photosynthesis
Rationale: Photosynthesis is the process by which plants, algae, and some
bacteria capture solar energy and convert it into chemical energy stored in
glucose and other organic molecules .
QUESTION 3
What is thermochemistry?
A) The study of temperature changes in chemical reactions
B) The amount of heat absorbed or released during chemical and physical changes
C) The study of thermodynamics in biological systems
D) The measurement of chemical reaction rates
,Correct Answer: B) The amount of heat absorbed or released during chemical and
physical changes
Rationale: Thermochemistry is specifically defined as the amount of heat
absorbed or released during chemical and physical changes .
QUESTION 4
The law of conservation of energy states that:
A) Energy can be created and destroyed in chemical reactions
B) Energy can be converted from one form to another but cannot be created or
destroyed
C) Energy is only conserved in chemical reactions
D) Heat is the only form of energy
Correct Answer: B) Energy can be converted from one form to another but cannot
be created or destroyed
Rationale: The law of conservation of energy (first law of thermodynamics) states
that energy cannot be created or destroyed, only converted from one form to
another .
, QUESTION 5
What is the SI unit of energy?
A) Calorie (cal)
B) Joule (J)
C) Kelvin (K)
D) Watt (W)
Correct Answer: B) Joule (J)
Rationale: The joule (J) is the SI unit of energy. The calorie is also a unit of energy
but is not the SI unit .
QUESTION 6
One calorie is equal to how many joules?
A) 1.000 J
B) 4.184 J
C) 4.184 kJ
D) 0.239 J
