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IB Chemistry EE Exemplars

View exemplars for IB Chemistry EE coursework, verified with scores by IB examiners.

Showing 31 of 31 exemplars

To what extent do the steeping temperature (50℃, 60℃, 70℃, 80℃, 90℃) and
tea processing category (black, white, green) affect the Total Phenolic Content
(mg g-1) of the tea (Camellia sinensis var. sinensis) beverage obtained at standardised
conditions (1.00 g leaves/100 cm3 water, 5 min brewing time), determined by the
Folin-Ciocalteu assay? - Chemistry EE exemplar scored A

To what extent do the steeping temperature (50℃, 60℃, 70℃, 80℃, 90℃) and tea processing category (black, white, green) affect the Total Phenolic Content (mg g-1) of the tea (Camellia sinensis var. sinensis) beverage obtained at standardised conditions (1.00 g leaves/100 cm3 water, 5 min brewing time), determined by the Folin-Ciocalteu assay?

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

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

What are the potential cardiovascular health implications of the change in iodine values ( 𝐼₂𝑔/100𝑔 𝑜𝑖𝑙) after refrying oils at 175°C for three one hour cycles asmeasured by titration in 15𝑐𝑚³ 𝑜𝑓 99. 5% cyclohexane with 0. 1 𝑚𝑜𝑙/𝐿Sodium thiosulphate (Na2S2O3) ? - Chemistry EE exemplar scored A

What are the potential cardiovascular health implications of the change in iodine values ( 𝐼₂𝑔/100𝑔 𝑜𝑖𝑙) after refrying oils at 175°C for three one hour cycles asmeasured by titration in 15𝑐𝑚³ 𝑜𝑓 99. 5% cyclohexane with 0. 1 𝑚𝑜𝑙/𝐿Sodium thiosulphate (Na2S2O3) ?

“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?” - Chemistry EE exemplar scored A

“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 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? - Chemistry EE exemplar scored A

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 impact of increased storage temperature (ºC) on the rate of carbon dioxide loss (mol dm-3 s-1) in different carbonated beverages? - Chemistry EE exemplar scored B

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?

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? - Chemistry EE exemplar scored B

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? - Chemistry EE exemplar scored B

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? - Chemistry EE exemplar scored B

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? - Chemistry EE exemplar scored B

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 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? - Chemistry EE exemplar scored B

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? - Chemistry EE exemplar scored B

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? - Chemistry EE exemplar scored B

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? - Chemistry EE exemplar scored B

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? - Chemistry EE exemplar scored B

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? - Chemistry EE exemplar scored B

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? - Chemistry EE exemplar scored B

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 - Chemistry EE exemplar scored C

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? - Chemistry EE exemplar scored C

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?

To what extent does the concentration of ethanol (0-50%) affect the rate of hydrolysis of aspirin, as determined via visible spectrophotometry. Furthermore, investigate the effect of molecular structure in terms of the number and position of hydroxyl groups of 3 carbon chain alcohols (propan-1-ol, propan-2ol, propylene glycol and glycerol) at 50% concentration on the above. - Chemistry EE exemplar scored C

To what extent does the concentration of ethanol (0-50%) affect the rate of hydrolysis of aspirin, as determined via visible spectrophotometry. Furthermore, investigate the effect of molecular structure in terms of the number and position of hydroxyl groups of 3 carbon chain alcohols (propan-1-ol, propan-2ol, propylene glycol and glycerol) at 50% concentration on the above.

¿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? - Chemistry EE exemplar scored C

¿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. - Chemistry EE exemplar scored C

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? - Chemistry EE exemplar scored C

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 do 100.00g of different types of oils (sunflower oil, palm oil, peanut oil, coconut oil, and olive oil) with their saponification values affect the pH, being closest to 7, and rate of curing of soap after 3 weeks of curing during the saponification process, conducted at a constant temperature of 50°C for 30 minutes? - Chemistry EE exemplar scored C

“To what extent do 100.00g of different types of oils (sunflower oil, palm oil, peanut oil, coconut oil, and olive oil) with their saponification values affect the pH, being closest to 7, and rate of curing of soap after 3 weeks of curing during the saponification process, conducted at a constant temperature of 50°C for 30 minutes?

To what extent does the brand of acetaminophen pills (Amazon, Walgreens, and Tylenol) affect the accuracy of the acetaminophen content label by determining the concentration (mol dm-3) of acetaminophen when neutralized using a standard 0.015M sodium hydroxide solution by the method of acid-base titration?

To what extent does the unsaturation level of fats in Hokubee Meltique Meat, affect the cardiovascular health of an average adult? - Chemistry EE exemplar scored C

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

What is the effect of the chain length and structure of alcohols on the mass of carbon from incomplete
combustion? - Chemistry EE exemplar scored C

What is the effect of the chain length and structure of alcohols on the mass of carbon from incomplete combustion?

How successful is ZnO as a photocatalyst at removing C13H18O2, Ibuprofen from wastewater, with the greatest efficiency, within the range? - Chemistry EE exemplar scored C

How successful is ZnO as a photocatalyst at removing C13H18O2, Ibuprofen from wastewater, with the greatest efficiency, within the range?

To what extent can various analytical methods, such as Spectrophotometry, Gravimetry, and Iodometric Titration, accurately measure copper content in brass alloys, and what are the implications of their respective strengths and limitations on the accuracy and precision of the obtained results? - Chemistry EE exemplar scored C

To what extent can various analytical methods, such as Spectrophotometry, Gravimetry, and Iodometric Titration, accurately measure copper content in brass alloys, and what are the implications of their respective strengths and limitations on the accuracy and precision of the obtained results?

n What Ways does Brewing Time Variation (1 Minute
Variation) Affect the Physical, Chemical, and Antioxidant Properties of Teas (1.00 gram), Considering Changes in Gallic Acid Concentration, pH, and Colour? - Chemistry EE exemplar scored C

n What Ways does Brewing Time Variation (1 Minute Variation) Affect the Physical, Chemical, and Antioxidant Properties of Teas (1.00 gram), Considering Changes in Gallic Acid Concentration, pH, and Colour?

How Does the Temperature and Pressure of Water Used to Brew Ground Coffee Affect the Caffeine Concentration in the Final Product? - Chemistry EE exemplar scored D

How Does the Temperature and Pressure of Water Used to Brew Ground Coffee Affect the Caffeine Concentration in the Final Product?