HESI A2 Chemistry Practice Questions 2025–
2026 – Complete Exam Review with Detailed
Answers
What are all metric measurements composed of? -
Correct Answer-Metric prefix and a basic unit of
measure
What is the most commonly used temperature scale
in the scientific community? - Correct Answer-Celsius
or centigrade
The nucleus of an atom contains or is made up of: -
Correct Answer-protons and neutrons
What is an atom that has a positive charge? - Correct
Answer-Cathode
In the periodic table, what are the rows called? -
Correct Answer-Periods
1
, 2
What is the Atomic number? - Correct Answer-
number of protons
What is the atomic mass? - Correct Answer-Average
mass of that elements isotopes
Chemical equations are written in which matter? -
Correct Answer-Reactants → Products
What is the charge on potassium in the compound
KCl - Correct Answer-+1
A catalyst is a substance that accelerates a reaction
by which of the following? - Correct Answer-Finding
an alternate pathway for a reaction that requires less
energy.
Percent concentration of a solution is expressed: -
Correct Answer-parts per 100 parts
What will 1 Liter of a 1 molar solution of any element
contain: - Correct Answer-The atomic mass in grams
of that element
2