Chemistry Regents worksheets

Use proton and neutron counts to identify elements and distinguish their isotopes.

Explain periodic radius trends and distinguish supplied numerical comparisons from qualitative predictions.

Identify outermost electrons and connect main-group valence patterns to likely ion charges.

Find ion charge from proton and electron counts and distinguish ion formation from isotope differences.

Use fractional abundances to find weighted atomic masses and check whether an answer is plausible.

Compare the energy needed to remove an electron and identify exceptions to a periodic trend.

Compare an atom’s attraction for shared electrons using periodic position and supplied electronegativity values.

Match a model emission spectrum and relate line wavelength to the energy released in a transition.

Use isotope signals and ion measurements to decide whether two fragments contain the same element.

Use gas mass and electron shell evidence to identify the contents of a sealed sign tube.

Use shell occupancy and proton counts to evaluate two claims about the sizes of atoms and ions.

Use successive energy requirements to predict which ions form and explain why removing an additional electron differs.

Use ion charges to write neutral formulas and explain the attraction in an ionic solid.

Identify shared and unshared electron pairs, and connect covalent bond models to chemical formulas.

Connect delocalized electrons to metallic bonding and compare measured resistance under controlled conditions.

Distinguish ions in a lattice from discrete molecules and interpret conductivity measurements.

Use supplied bond energies to estimate reaction energy from bond breaking and bond formation.

Combine conductivity, melting behavior, and particle models to classify materials.

Compare extended covalent networks with individual molecules and connect structure to melting behavior.

Use signal patterns before and after rinsing to diagnose two charge carriers in a simulated theater sensor.

Use bonding arrangements to distinguish two solids with the same boron-to-nitrogen ratio.

Use composition and charge evidence to distinguish bonds within a phosphate ion from attractions in an ionic solid.

Use two bonding diagrams to distinguish atoms per molecule from a ratio in a network.

Count valence electrons and model single bonds and lone pairs in familiar molecules.

Read multiple bonds in structural formulas and check the bond count around carbon.

Distinguish the arrangement of electron domains from the shape defined by the bonded atoms.

Use electronegativity to assign partial charges and compare polarity in covalent bond models.

Use molecular shape and the directions of equal bond dipoles to decide whether a net dipole remains.

Translate particle pictures into formulas and account for all atoms during a modeled chemical change.

Compare atom counts and connections in molecular formulas, structural formulas, and particle diagrams.

Interpret two carbon dioxide models and explain how changing bond symmetry lets a gas absorb infrared light.

Translate two carbon bond drawings and decide which measurements can distinguish their molecular structures.

Use the hydronium and chloride products to update a molecular model and check charge balance.

Use linear and bent oxygen molecule models to account for atoms during a change in molecular arrangement.

Explain temporary dipoles and use boiling-point data to compare nonpolar substances.

Identify hydrogen-bond donors and acceptors and compare the boiling points of two molecular isomers.

Use partial charges and molecular orientation to explain attractions between permanent dipoles.

Explain evaporation and use vapor-pressure data to compare liquids and identify boiling conditions.

Compare boiling points under controlled pressure and explain what boiling changes at the particle level.

Use mixing results and a particle model to compare solute–solvent attractions.

Use water uptake and regeneration data to explain how a humidity buffer protects stored paper.

Use paper chromatography data to compare attraction, travel distance, and the evidence for an ink match.

Use condensed-water and image readings to explain how a surface can change droplet shape and visibility.

Use a head-and-tail model to explain how detergent can disperse oily droplets.

Use mass readings and a particle model to explain why frost can shrink at a temperature below freezing.

Download a free combined gas law worksheet and separate worked answer key. Practice Kelvin conversions, pressure units, calculations and a gas-sampling scenario, then try the same questions online.

Use pressure–volume data and a particle model to explain gas compression at constant temperature.

Compare volume and Kelvin temperature and calculate gas volumes at fixed pressure.

Relate gas pressure to Kelvin temperature in a sealed rigid container and explain the particle behavior.

Use the 2025 Reference Tables to relate ideal-gas volume and amount at standard temperature and pressure.

Explain gas spreading through random particle motion and compare diffusion measurements.

Use controlled gas-volume comparisons to distinguish the effects of temperature and pressure.

Use the pressure and volume of trapped air to explain a diving bell’s behavior and predict when its sensor stays dry.

Use absolute pressure and Kelvin temperature to distinguish warming a gas from losing some of the gas.

Follow a gas mixture through two replacement cycles and evaluate whether a pressure reading reveals its composition.

Use a water vapor correction to compare dry gas amounts in two collection vessels.

Use fractions of two gas tracers crossing a film to separate a material effect from a pressure difference.

Calculate molarity from moles and solution volume, and compare samples of different sizes.

Use conservation of solute to calculate dilution and distinguish final volume from added solvent.

Read solubility curves, compare dissolved amounts, and predict crystallization when a solution cools.

Calculate mass concentration in ppm and compare samples with different total masses.

Classify solutions at a stated temperature and use solute balance to predict crystal mass.

Use formula ratios to count dissolved ions and explain why aqueous solutions can conduct.

Use controlled trials to explain how stirring and particle size affect dissolving time.

Use a precipitation model and measured results to balance ions and compare treatment trials.

Use dye standards to test a rinsewater sample and interpret the effect of filtering it.

Track calcium removal and sodium release using an ion exchange model and a sequence of measured samples.

Compare dissolved particle counts and freezing measurements to interpret dilution in a model brine bath.

Use restored solution volume and light measurements to distinguish concentration changes from evidence of a new substance.

Compare dissolved marker concentration with total amount in two liquid layers.

Connect chain structure and cross-links to measured stiffness, extension, and material choice.

Use density, stiffness, and water uptake to compare candidate materials for a defined use.

Use a charge-layer model to explain why displacement can fracture an ionic crystal.

Connect alloy composition to deformation and use measured properties to select a material.

Select conductors and insulators from measured current and connect conductivity to mobile charge.

Use measured recovery, processing energy, and durability to compare model container materials.

Use water uptake and weathering results to explain salt buildup in porous tiles and choose a treatment under two classroom constraints.

Use a polymer network model and repeated compression measurements to decide which gel protects a model instrument.

Use measurements and a fiber model to explain why a paper panel expands differently along two directions.

Compare solid and foamed blocks made of the same resin and predict how compression changes the average density.

Use separation and composition data to distinguish recovering magnetic grains from producing a pure sample.

Use coefficients to find mole ratios and predict product amounts from balanced equations.

Balance formulas using coefficients and check the number of atoms on each side.

Calculate formula masses with the 2025 Reference Tables and convert between grams and moles.

Convert reactant mass to product mass using molar masses and balanced coefficients.

Convert between moles and particle counts and distinguish molecules, atoms, and formula units.

Use balanced coefficients to identify the limiting reactant and calculate product and leftovers.

Calculate percent yield and distinguish measured product mass from the theoretical amount.

Use formula subscripts and current atomic masses to calculate an element’s percentage of a compound’s mass.

Account for mass in a closed reaction and explain why an open container’s measured mass may change.

Use balanced coefficients to compare ideal-gas volumes measured at the same temperature and pressure.

Use a hydration equation and mass measurements to track the water that becomes part of a plaster casting.

Balance an oxide conversion, track oxygen mass, and interpret an incomplete change in a model pigment sample.

Use a hydrate’s mass loss and molar masses to infer how much water is in the crystal formula.

Use a reaction equation and a measured gas amount to identify the limiting reactant and plan a refill.

Use a balanced equation to account for solid in the filter and dissolved material in the clear liquid.

Explain how concentration and temperature change the number of successful collisions per unit time.

Compare reaction pathways, read activation energies, and distinguish the barrier from the net energy change.

Use forward and reverse rates to identify dynamic equilibrium in a closed system.

Predict the net direction after a concentration change and distinguish immediate changes from a new equilibrium.

Use time to a fixed endpoint to compare rates and explain the effect of temperature on collisions.

Compare exposed area for equal amounts of solid and connect surface area to reaction rate.

Connect concentration to collision frequency and use controlled rate measurements to evaluate a claim.

Use the direction of heat transfer and measured compositions to explain a temperature shift at equilibrium.

Read fade data from a reversible color change and decide how to test whether temperature changes the rate.

Compare how fast dye leaves solution and use a rinse step to reason about reversible binding.

Use early gas readings and final amounts to evaluate whether rinsing restores a solid catalyst’s effect.

Use a stable isotope tracer and unchanged crystal mass to test whether salt continues to exchange at saturation.

Use calcium readings and a balanced equation to evaluate how a model limestone sample reacts with an acidic solution.

Classify aqueous samples, compare hydronium concentrations, and constrain pH using indicator colors.

Interpret hydronium and hydroxide particle counts and distinguish acid strength from concentration.

Use formula and charge to assign oxidation numbers and track changes in iron compounds.

Calculate amounts of acid and base for neutralization using balanced equations and solution concentration.

Distinguish acid ionization from concentration and interpret conductivity using mobile ions.

Use half reactions to identify electron loss and gain and account for every transferred electron.

Track electron transfer, electrode changes, and charge balance in a model electrochemical cell.

Explain barrier and sacrificial protection and compare corrosion measurements for coated steel.

Use an iodine indicator and balanced half-reactions to compare how much vitamin C remains in three model juice samples.

Use equal pH readings and a base challenge to distinguish initial acidity from resistance to pH change.

Compare hydrogen ion amounts in two rain samples and explain why equal-volume mixing requires concentration arithmetic.

Balance electron transfer and distinguish copper lost from silver gained in a metal strip model.

Use ion counts and an electron balance to interpret forward and reverse changes in an iron model.

Compare pH and conductivity measurements to explain why a neutral solution can still contain mobile ions.

Use an electron balance and measured metal amounts to find where a deposition model misses part of the current.

Calculate heat and temperature change from mass, specific heat capacity, and measured temperatures.

Read temperature plateaus and connect warming and phase changes to particle energy.

Explain the direction of heat transfer and use measured temperatures to identify thermal equilibrium.

Calculate the energy needed to melt a sample and separate melting energy from warming energy.

Calculate heat and mass for vaporization and account separately for warming and phase change.

Use heat flow and water-bath temperatures to determine the sign of reaction heat.

Use heat balance and measured temperatures to calculate energy transfer and a sample’s specific heat.

Trace heat flow as a rink freezes and test whether an added insulation panel meets two design limits.

Use warm and cool water measurements to separate the heat gained by the liquid from heat gained by a calorimeter cup.

Read a warming graph to explain how melting keeps a model sample below its temperature limit.

Compare energy per gram in a warming model and use it to estimate how much liquid can evaporate.

Follow water between gas and liquid in a sealed model and connect condensation to energy transfer.

Use a temperature graph to distinguish a steady reading from a stop in heat transfer.

Use wave speed and frequency to find wavelength and interpret electromagnetic spectrum data.

Use the 2025 reference spectrum to classify radiation and select sources by wavelength.

Compare energy per photon by frequency and wavelength and calculate it using Planck’s constant.

Read a model energy-level diagram and relate electron transitions to absorbed or emitted photon energies.

Compare photon energies to a model molecular threshold and interpret wavelength evidence.

Compare light transmission and absorption to explain why an inspection can miss a swapped glass panel.

Use source and detector readings to distinguish fluorescence from light scattered by paper.

Use contact temperatures and detector readings to distinguish infrared emission from reflection.

Use three energy levels and two photon readings to distinguish a direct transition from a two-step return.

Use wavelength-specific calibration to compare two components of a mixed beam.

Trace atoms through a photosynthesis model and connect light input to stored chemical energy.

Trace carbon from carbon dioxide into plant compounds and interpret carbon-label evidence.

Trace atoms through a cellular respiration model and explain how cells obtain usable energy.

Compare matter and energy in the two net processes and interpret net oxygen change.

Interpret a carbon dioxide exchange experiment and separate net uptake from gross photosynthesis in model leaves.

Use a blank chamber and paired carbon dioxide readings to test a claim about photosynthesis.

Combine dissolved and collected oxygen measurements to evaluate a photosynthesis claim.

Use a net carbon dioxide graph to choose a lighting schedule in a classroom model.

Use two stable-isotope label trials to determine the source of the oxygen gas released in a model of photosynthesis.

Balance mass and atomic numbers to identify emitted particles and daughter nuclei.

Read a half-life from measurements and predict the remaining amount after repeated half-lives.

Complete alpha-decay balances and identify how the daughter nucleus changes.

Balance beta-minus decay and distinguish a change in the nucleus from a change in an atom’s electrons.

Distinguish types of nuclear radiation and use a shielding model to interpret penetration.

Distinguish nuclear splitting from joining and check mass-number and atomic-number balances.

Read a carbon-14 decay graph, estimate an age for buried wood, and explain how a modern fiber changes that estimate.

Subtract a constant background from detector counts and use the corrected data to compare half-life estimates.

Use mass-number and charge balances to distinguish two decay paths that produce the same daughter nuclide.

Use half-lives to explain why the total signal from a mixed sample does not fall by the same fraction each interval.

Use parent and daughter amounts to estimate age and identify what happens if daughter atoms were present at the start.

Combine two decay records and evaluate what the endpoints can reveal about an intermediate nucleus.

Identify manipulated and measured variables, and design a controlled comparison from trial records.

Use minimum requirements and ranked preferences to justify a design choice from test data.

Compare repeated measurements and investigate an unusually different result before using it in a conclusion.

Use matched conditions to isolate a test factor and design a comparison from model data.

Select a feasible design using measured heat loss, mass, and cost.

Use simulated particle counts and airflow measurements to choose a filter and test the effect of changing fan settings.

Use matched tracer tests to distinguish movement through a pouch seam from movement through the film.

Use blank readings and a known sample to distinguish contamination from sensor performance.

Use two measured solutes to choose a membrane that removes salt while retaining a colored polymer.

Use a reference mass, a timing limit, and repeat measurements to evaluate a drying method.