Chemistry Exemplars

About Chemistry Coursework Exemplars

The Coursework Exemplars section gives IB students (both SL and HL) access to real, high-quality samples of IB Chemistry Internal Assessments (IA) and Extended Essays (EE). Each exemplar is carefully selected to model top-scoring work, aligned with IB assessment rubrics and showcasing what examiners expect at different achievement levels.

On this page, you'll find full-length exemplars annotated with examiner commentary, highlighting strengths, weaknesses, and specific rubric-based insights. These samples demonstrate how ideas are structured, arguments developed, and criteria met to achieve high marks.

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About Chemistry Coursework Exemplars

How does the pH level affect the hydrolysis rate of an insulin-mimicking peptide, as measured by the reaction time required for complete purple color development in a ninhydrin-based colorimetric assay?

What is the mass content of acetylsalicylic acid in different types of commercially available tablets (Aspirin, Aspirin Pro, Maxipirin, Polopiryna, Polopiryna Max), as determined by the volume of 0.0800M hydrochloric acid (HCl) in back titration with excess 0.267M sodium hydroxide (NaOH)?

How does different types of solvents such as chloroform, diethyl ether, dichloromethane, ethyl acetate and hexane affect the efficiency of caffeine extraction using the method Liquid-Liquid Extraction by measuring the quantity of extracted caffeine crystals formed ?

How does the presence of the catalyst Copper (II) Sulfate and Iron (II) Sulfate affect the activation energy of the reaction Iron (III) Nitrate and Sodium Thiosulfate?

¿Cómo varía la velocidad enzimática de la amilasa en función de la temperatura y que relación tienen ambas variables?

How does different pH(2, 4, 6, 7, 8, 10) of buffer solutions affect the oxidation browning of apples, using uv spectrophotometry to observe its polyphenol oxidase(PPO) activity in intervals of 10 minutes (10, 20, 30)?

How does the change in temperature (25oC to 65oC) affect the concentration of hypochlorite ions in bleach solution, measured through redox titration?

How does varying the volume of orange peel solution (4 cm3 , 8 cm3, 12 cm3 , 16 cm3, 20 cm3 & 24 cm3) with a fixed concentration of 0.01 g cm-3 affect the pH and absorbance of the treated mine wastewater?

INVESTIGATING THE EFFECT OF TEMPERATURE ON THE CALCIUM CONTENT IN COW’S MILK

Investigating how the temperature change (30 °C, 40 °C, 50 °C, 60 °C and 70 °C) affect the solubility of 1.00 g of Potassium Chloride (KCl) using a chloride probe when dissolved in 100 cm3 of deionized water for 180 seconds.

The effect of changing the sugar concentration (25%, 17%, 13%, 8%, 4%, 0%) on the pressure of carbonated water.

To what extent does the thickness of an electrophoretically deposited (EPD) reduced graphene oxide (rGO) coating affect the electrical conductivity of copper (Cu) wire?

How does the absorption of light at specific wavelengths by beetroot juice change when it is mixed with solutions of varying concentrations of NaOH?

How does the concentration of hydrated CuSO4 (0.0 M, 0.2 M, 0.4 M, 0.6 M, 0.8 M, 1.0 M) in a voltaic cell with CuSO4 at a Cu electrode and ZnSO4 at a Zn electrode affect the voltage (V) produced?

“How do varying concentrations of eggshell powder adsorbent (1.00, 2.00, 3.00, 4.00, 5.00 grams) alongside the adsorption duration (5, 10, 15, 20, 25, 30 minutes) affect its efficacy on the concentration of manganese(VII) ions in wastewater?”

To what extent do different concentrations [10, 20, 30, 40, 50 (%)] of stearic acid (octadecanoic acid) in mixture with paraffin wax (hentriacontane) affect enthalpy change (ΔH) (kJ/mol) of combustion of candles (each 50 g) measured with use of calorimetry method?

To what extent do temperature, the availability of light, and the availability of oxygen relatively affect the rate of vitamin C degradation in 20 ml sample solutions prepared from vitamin C tablets during 2 weeks of storage?

What is the effect of aqueous NaCl concentration increase (0.5%, 1%, 3.5%, 5%, 10%) on the mass loss of iron?

How do different battery types (carbon-zinc, alkaline, or nickel-metal hydride) influence the rate of copper deposition over a 10-minute electroplating process?

What is the impact of increased storage temperature (ºC) on the rate of carbon dioxide loss (mol dm-3 s-1) in different carbonated beverages?

How does varying the concentration of Iron(III) chloride affect the rate of hydrogen peroxide decomposition?

To what extent are the synthetic food colorants Allura Red (CI 16035), Ponceau 4R (CI 16255), and Sunset Yellow FCF (CI 15985) present in tomato sauce samples from street food vendors in Lakarsantri, Surabaya analyzed through Paper Chromatography?

How does the bioethanol yield (ml) from the fermentation of 1.5kg of corn, potato, and sugarcane differ under controlled conditions, and what factors influence the efficiency of production?

How does 125ml solution of hydrochloric acid in varying concentrations (10%, 20%, 40%, 60%, 80%, 100%) affect the corrosion rate of different iron based alloy screws after 2 hours of submersion?

How does the duration of 800W microwave exposure affect the rate of acetaminophen hydrolysis in the presence of acidified iron(III) chloride (FeCl3)(aq), measured by quantifying the iron(III)+p-aminophenol complex ion in alkaline conditions?

How do varying water bath temperatures (15℃, 20℃, 25℃, 30℃, 35℃) influence the oxidation rate of ethanol by potassium permanganate in a basic medium, as measured by red light absorption at 650 nm?

How does the magnitude of ionic radii of cations, specifically Sodium (Na+), Magnesium (Mg2+), Calcium (Ca2+), and Potassium (K+), in chloride salts, affect the corrosion rate on an iron nail as measured through immersion tests and spectrophotometry over 6 days?

How does the accuracy of Redox Potential compare to Spectrophotometry for measuring concentration of copper ions in solution?

To what extent do lipase enzymes from different seeds (Sunflower kernel, Pumpkin, Sesame, Flax, Fenugreek) influence the antioxidant activity and the rate of NaOH neutralization by fatty acids during the hydrolysis of palm oil as a natural product?

How does the transmission of UV light through coloured light filters affect the concentration of linalool during the storage of extracted Basil oil, dissolved in ethanol, as measured by Gas Chromatography Mass Spectrometry?

How does pH (3, 5, 7, 9, 11) affect the equilibrium adsorption capacity of 10 ppm methylene blue onto 0.5g of granular activated carbon, and which kinetic model, pseudo-first-order or pseudo-second-order, best describes this process?

How does the mass of volatile organic compounds extracted from books by a distillation differ amongst books of different ages (24, 34, 44, 54, 64 years old) when 3 grams of paper from each book are left in 150cm3 of acetone for 15 days?

How do different peanut oil extraction conditions (drying, roasting, hydration) affect the free fatty acid content and rust-removal efficiency of biodiesel made from the peanut oil, determined by the change in mass (±0.0001 g) of rusted iron nail?

Investigating the effect of the chain length, position of the functional group and the calorimeter design on the enthalpy of combustion of alcohols

How does changing the time in 5 minute intervals (0, 5, 10, 15, 20, 25 minutes) for which 3 grams of Phaseolus vulgaris (Lightly speckled kidney beans) are simmered affect its iron content in milligrams as determined by spectrophotometric methods using a wavelength of 477.1 nm?

¿En qué medida afectan diferentes métodos de cocción como el hervido, el salteado y al vapor, y variaciones en el pH al contenido de clorofila en las espinacas, antocianinas en las remolachas y carotenoides en las zanahorias?

How does the polarity of the different solvents (hexane, dichloromethane, chloroform, diethyl ether, ethanol, ethyl acetate, acetone) affect the amount of extracted caffeine? A determination by iodometric titration.

What is the effect of diluting acetone and denatured alcohol mixtures obtained from acetone-based nail polish removers through distillation in dissolving nail polish from artificial nails?

To what extent does the unsaturation level of fats in Hokubee Meltique Meat, affect the cardiovascular health of an average adult?