Chemistry Lab Practice Tests
Free, AI-generated Chemistry Lab practice tests for Science Olympiad. Choose Invitational, Regional, State, or National difficulty, import past exam PDFs, and track your scores over time.
Chemistry Lab runs in Division C for the 2027 season. 2027 rules focus: Kinetics and Gases.
Indexed Chemistry Lab Practice Tests by Difficulty
Reviewed full-length Chemistry Lab practice tests, each with every question and answer choice listed on its own page.
Medium:10 questions · 2026
What Chemistry Lab Tests Cover
chemical reactions, stoichiometry, equilibrium, acid-base chemistry, redox reactions, lab safety, and analytical techniques.
Concentration formulas
- Molarity (M) = moles solute / liters solution. Units: mol/L
- Molality (m) = moles solute / kg solvent. Units: mol/kg
- Dilution: M₁V₁ = M₂V₂ (moles before = moles after)
- Mass percent = (mass solute / mass solution) × 100%
- Parts per million (ppm) = (mass solute / mass solution) × 10⁶
- Mole fraction: χA = nA / (nA + nB + ...)
Stoichiometry
- Moles = mass / molar mass = molecules / (6.022×10²³)
- At STP (0°C, 1 atm): 1 mole gas = 22.4 L
- Limiting reagent: Reagent that runs out first, determines max product
- % yield = (actual yield / theoretical yield) × 100%
- Molar mass from periodic table: Add atomic masses of all atoms
Acid-base chemistry
- pH = -log[H⁺], pOH = -log[OH⁻], pH + pOH = 14 (at 25°C)
- Kw = [H⁺][OH⁻] = 1×10⁻¹⁴ at 25°C
- Strong acids (completely dissociate): HCl, HBr, HI, HNO₃, H₂SO₄, HClO₄
- Strong bases: NaOH, KOH, Ca(OH)₂, Ba(OH)₂
- Weak acid: Ka = [H⁺][A⁻]/[HA], pKa = -log(Ka)
- Weak base: Kb = [BH⁺][OH⁻]/[B], pKb = -log(Kb)
- Ka × Kb = Kw for conjugate pairs
- Henderson-Hasselbalch: pH = pKa + log([A⁻]/[HA])
- Buffer: Weak acid + conjugate base, resists pH change
- Titration: Equivalence point when moles acid = moles base
Gas laws
- Ideal Gas Law: PV = nRT (R = 0.0821 L·atm/mol·K = 8.314 J/mol·K)
- Boyle's Law: P₁V₁ = P₂V₂ (constant T, n)
- Charles's Law: V₁/T₁ = V₂/T₂ (constant P, n)
- Avogadro's Law: V₁/n₁ = V₂/n₂ (constant P, T)
- Dalton's Law: Ptotal = P₁ + P₂ + P₃ + ... (partial pressures)
- Graham's Law: Rate₁/Rate₂ = √(M₂/M₁) (effusion/diffusion)
Equilibrium
- Keq = [products]^coefficients / [reactants]^coefficients (only gases and aqueous)
- Q < K: Forward reaction favored, Q > K: Reverse reaction favored
- Le Chatelier's Principle: System shifts to counteract stress
- Ksp = [ions]^coefficients (solubility product)
Redox reactions
- Oxidation: Loss of electrons, increase in oxidation number
- Reduction: Gain of electrons, decrease in oxidation number
- OIL RIG: Oxidation Is Loss, Reduction Is Gain
- Oxidizing agent: Gets reduced, causes oxidation
- Reducing agent: Gets oxidized, causes reduction
- Balancing: Balance atoms, then charges with electrons
Thermochemistry
- ΔH = Hproducts - Hreactants (negative = exothermic, positive = endothermic)
- q = mcΔT (specific heat), q = nCΔT (molar heat capacity)
- Hess's Law: ΔH total = sum of ΔH for each step
- Bond energy: Energy required to break bonds
Lab safety & techniques
- Always add acid to water (never water to acid) - "Do as you oughta, add acid to water"
- Meniscus: Read at bottom of curve for most liquids
- Significant figures: Measurement uncertainty, trailing zeros matter
- Burette: 0.01 mL precision, used for titrations
- Graduated cylinder: ~1% precision, better than beakers
Common mistakes
- Forgetting to convert temperature to Kelvin for gas laws
- Using wrong R value for units
- Confusing molarity vs molality
- Adding water to acid instead of acid to water
How SciolyPrep Helps You Practice
AI Test Generator
Generate original Chemistry Lab questions at your chosen difficulty. AI-generated questions and answers can contain mistakes, so check them against reliable sources.
Real Exam Structures
Import past Chemistry Lab exam PDFs, or use the Exam-Inspired Generator to get new questions modeled on real exam formats.
Progress Tracking
Scores, timing, and weak-area insights for every attempt, so you know exactly what to review before competition day.
Frequently Asked Questions About Chemistry Lab
How do I practice for Chemistry Lab in Science Olympiad?
Start with the current year's rules manual for Chemistry Lab, then drill practice tests in increasing difficulty: Invitational, then Regional, then State and National level. SciolyPrep generates unlimited original Chemistry Lab practice tests at each difficulty level, so you can target your weak areas instead of hunting for scarce past exams.
Are the practice tests free?
Yes - you get 5 free AI test generations every month, forever, no credit card needed. Paid plans unlock unlimited generations for the full season if you need more volume.
What difficulty Chemistry Lab test should I start with?
Start at the Invitational or Regional level to build fundamentals, then move up to State and National difficulty as competition approaches. Regional tests mix recall with application; State and National tests add multi-step reasoning and data interpretation.
Can I practice with real past Science Olympiad exams?
Yes. You can import a past exam PDF from your computer or a Google Drive link, and the app parses every question into an interactive test. There is also an Exam-Inspired Generator that analyzes real exam structures (topic mix, format, difficulty) and writes 100% original new questions in that style.