HESI A2 Exam 2026: Sections, Scores & Study Plan
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What subatomic particle has a positive electrical charge and is located in the nucleus of an atom?
Atomic Structure
Question · Easy
The HESI A2 is modular with up to 10 sections and no universal pass mark. See scored vs. pilot question counts, 2026 score requirements by school, and a free study plan.
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What does the atomic number of an element represent?
Two atoms are isotopes of each other if they have the same number of ____ but different numbers of ____.
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How many electrons can the second electron shell (n=2) hold at maximum?
Question · Medium
An atom of sodium (Na) has an atomic number of 11 and a mass number of 23. How many neutrons does this atom contain?
Which of the following is the correct electron configuration for a neutral oxygen atom (atomic number 8)?
Which group on the periodic table contains the noble gases?
What is the term for the horizontal rows of the periodic table?
Which element has the highest electronegativity?
As you move down a group on the periodic table, the atomic radius of the elements generally:
How many valence electrons does a neutral atom of magnesium (Mg, atomic number 12) have?
Which of the following best describes a cation?
What is the average atomic mass of an element based on?
Which property of an element is determined primarily by its number of valence electrons?
In a covalent bond, atoms are held together by:
Chemical Bonding
Which of the following compounds contains an ionic bond?
A bond between two atoms with a large difference in electronegativity (greater than approximately 1.7) is best classified as:
Which type of intermolecular force is responsible for the unusually high boiling point of water?
Which molecule is nonpolar overall despite containing polar bonds?
Question · Hard
What is the strongest of the typical intermolecular forces listed below?
In the compound MgCl2, what is the charge on the magnesium ion?
Which of the following describes a double covalent bond?
Which reaction type is represented by the equation 2H2 + O2 -> 2H2O?
Chemical Reactions
Which type of reaction is represented by 2H2O2 -> 2H2O + O2?
Balance the equation: __ Al + __ O2 -> __ Al2O3. What are the correct coefficients?
In the reaction Zn + 2HCl -> ZnCl2 + H2, which type of reaction is taking place?
What type of reaction is represented by AgNO3 + NaCl -> AgCl + NaNO3?
Which law states that mass is neither created nor destroyed in a chemical reaction?
In the balanced equation 2 Na + 2 H2O -> 2 NaOH + H2, how many moles of hydrogen gas are produced per mole of sodium reacted?
Which of the following is a sign that a chemical reaction has occurred?
What is the molar mass of calcium carbonate (CaCO3)? Use Ca = 40.08, C = 12.01, O = 16.00.
Stoichiometry
How many molecules are present in 1 mole of glucose (C6H12O6)?
How many moles are in 36.0 g of water (H2O)? Use H = 1.008 and O = 16.00.
In the reaction N2 + 3 H2 -> 2 NH3, if 2 moles of N2 react with 9 moles of H2, which is the limiting reagent?
How many grams are in 0.50 mol of sodium chloride (NaCl)? Use Na = 22.99 and Cl = 35.45.
Which state of matter has a definite volume but no definite shape?
States Of Matter
According to Boyle's Law, what happens to the pressure of a gas when its volume is decreased at constant temperature?
Charles's Law describes the relationship between which two variables for a fixed amount of gas at constant pressure?
In the ideal gas law PV = nRT, the variable T must be expressed in which unit?
What is the term for the direct change from solid to gas without passing through the liquid phase?
At standard temperature and pressure (STP), what is the molar volume of an ideal gas?
A gas occupies 4.0 L at 1.0 atm. If the temperature is held constant and the pressure increases to 2.0 atm, what is the new volume?
Which of the following best describes a homogeneous mixture?
Solutions
In a saltwater solution, which is the solute and which is the solvent?
What is the molarity of a solution that contains 2.0 moles of solute dissolved in 4.0 L of solution?
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