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Handmade comic of metal transferring 250 joules to water: metal heat is negative and water heat positive in an isolated model with container heat neglected.

Calorimetry and Heat: Calculate q and Choose Its Sign

Use calorimetry to calculate heat from mass, specific heat, and temperature change. Follow a water example, choose heat signs, and review six questions.

Hand-drawn toy factory analogy for limiting reactants: three car bodies and eight wheels make two four-wheel cars, leaving one unused body and no wheels.

Stoichiometry and Limiting Reactants: Calculate Yield

Use stoichiometry to find the limiting reactant, theoretical yield, and percent yield. Follow mole-ratio examples and check six review questions.

Hand-drawn reaction card with the balanced magnesium-oxygen equation holds combination and redox badges, showing that classifications describe different features.

Reaction Types and Redox: Oxidation, Reduction and Agents

Hand-painted owl compares empirical CH2O with molecular C6H12O6; the molar-mass ratio 180.18 divided by 30.03 gives a subscript multiplier of six.

Empirical and Molecular Formulas: Calculate Atom Ratios

Hand-drawn mole chemist magnifies one carbon dioxide molecule containing one carbon and two oxygen atoms; CO2 has molar mass 44.01 g/mol.

The Mole and Molar Mass: Convert Grams to Molecules

Hand-painted comic kettle releases two intact bent H2O molecules: boiling separates water molecules while their oxygen-hydrogen covalent bonds stay intact.

Molecular Shape and Polarity: Why Bond Dipoles May Cancel

Hand-sketched tailor compares sodium and potassium atom-cloud cartoons: potassium has outer shell four, a larger radius and lower first ionization energy than sodium with outer shell three.

Electrons and Periodic Trends: Explaining Atomic Size and Ionization Energy

$Hand-lettered calculator and cricket comic shows 4.5 times ten to the negative third equals positive 0.0045, distinguishing a negative exponent from a negative number.$