HESI A2 section
Chemistry
Matter, atoms and the periodic table, bonding, equations and reactions, solutions, acids and bases, nuclear chemistry and biochemistry.
- 30 questions (25 scored)
- 25 minutes
- 15 topics
Measurement & matter
- Scientific Notation, SI Units & Temperature ScalesWriting and working with scientific notation, SI base units and prefixes in science, and converting among °F, °C and kelvin.
- Matter, States & Phase ChangesPure substances vs mixtures, physical vs chemical properties and changes, the states of matter and the phase changes between them (owns which absorb or release heat).
Atoms & the periodic table
- Atomic Structure, Isotopes & IonsProtons, neutrons and electrons, atomic number and mass, isotopes, ions, and electron shells and valence electrons.
- The Periodic Table & Its TrendsGroups and periods, metals, nonmetals and metalloids, the named families, and trends in size, electronegativity and reactivity.
Bonding
Chemical reactions
- Chemical Equations & BalancingReading an equation (reactants, products, coefficients, states), conservation of mass, and balancing equations.
- Types of Chemical ReactionsSynthesis, decomposition, single and double replacement and combustion — recognizing each from its equation (neutralization detail: Acids, Bases & pH).
- The Mole & StoichiometryThe mole and Avogadro's number, molar mass, and using mole ratios from a balanced equation to find amounts.
- Reaction Rates, Catalysts & EquilibriumReaction speed (temperature, concentration, surface area, catalysts), activation energy, energy diagrams and endo/exothermic reactions (owns them), equilibrium, Le Chatelier.
- Oxidation-ReductionOxidation as electron loss and reduction as gain, oxidation numbers, and identifying oxidizing and reducing agents.
- Energy in Chemistry: Heat & Energy ChangesKinetic, potential and field energy in matter, heat versus temperature, and the sun as the source (endo/exothermic reactions: Reaction Rates; phase-change heat: States).
Solutions, acids & bases
Nuclear chemistry & biochemistry
- Nuclear ChemistryAlpha, beta and gamma radiation, balancing nuclear equations, half-life, and fission versus fusion.
- Organic Chemistry & Biochemistry BasicsWhy carbon forms chains, hydrocarbons and functional groups, dehydration synthesis and hydrolysis, and enzymes as proteins (catalysis itself: Reaction Rates).
Study Chemistry topic by topic, then take the timed section test.
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