HESI A2 Chemistry study plan

Classify matter by state and composition (element, compound, homogeneous/heterogeneous mixture) using particle-level reasoning

Convert between metric prefixes and SI units for mass, length, volume, and temperature

Apply significant-figure rules and dimensional analysis to multi-step unit conversions

Distinguish physical from chemical changes and intensive from extensive properties

Calculate density, mass, and volume from experimental data and use density as a conversion factor

Interpret heating/cooling curves and phase-change energy in terms of kinetic and potential energy

Describe the historical experiments (Thomson, Rutherford, Millikan) that shaped atomic models

Define atomic number, mass number, and isotope notation and compute subatomic particle counts

Write electron configurations and orbital diagrams for main-group elements using the Aufbau principle, Hund's rule, and Pauli exclusion

Relate valence-electron count to group number and predict common ion charges

Explain periodic trends (atomic radius, ionization energy, electronegativity) across periods and down groups

Identify s-, p-, d-, and f-block elements and locate metals, nonmetals, and metalloids on a blank periodic table

Predict ionic versus covalent bonding from element position and electronegativity difference

Draw Lewis structures for simple molecules and polyatomic ions, including resonance and octet exceptions

Use VSEPR to assign molecular geometry and approximate bond angles for 2- to 4-electron-domain species

Classify bond polarity and molecular polarity from geometry and dipole vectors

Name and write formulas for ionic compounds, including transition metals with Roman-numeral charges and polyatomic ions

Name and write formulas for binary covalent compounds and common acids

Calculate molar mass from chemical formulas and convert among mass, moles, and particles

Determine empirical and molecular formulas from percent composition or combustion-style mass data

Balance chemical equations and identify synthesis, decomposition, single-replacement, double-replacement, and combustion reactions

Predict products of double-replacement and combustion reactions and check solubility rules for precipitates

Perform mole-mole and mass-mass stoichiometric calculations from a balanced equation

Identify limiting reactants and calculate theoretical and percent yield

Calculate molarity from mass and volume and perform dilution calculations using M1V1 = M2V2

Describe how ionic solutes dissociate and distinguish electrolytes from nonelectrolytes

Solve solution stoichiometry problems that combine molarity with reaction mole ratios

Interpret solubility curves and predict saturation, unsaturation, and supersaturation at a given temperature

Integrate all four domains by solving mixed-topic practice sets under timed conditions

Re-teach the three weakest objectives from the error logs of weeks 1-7 using original worked examples

Memorize high-yield constants, polyatomic ions, solubility rules, and periodic trends through spaced retrieval

Simulate the exam with a full-length practice test and analyze item-level errors by domain