IB Chemistry Grade A EE examples

What is the effect of using 5 g of different oils - palm oil, avocado oil, castor oil, and olive oil -on the production of soap bars with a pH closest to 7, when measured after saponification under constant conditions of 50°C and 30 minutes of reflux?

What is the effect of varying temperatures (50°C, 60°C, 70°C, 80°C, 90°C) and processing types (black, white, green) on the total phenolic content (mg g⁻¹) of tea (Camellia sinensis var. sinensis) infusions prepared under standardised conditions (1.00 g of leaves per 100 cm³ of water, 5-minute brewing time), as measured using the Folin-Ciocalteu method?

: What is the effect of different corrosion inhibitors (green tea extract, acrylic paint, and chrome plating) on the rate of corrosion and the amount of rust formed on an iron nail in a 3.5% NaCl solution, as measured using spectrophotometric and mass-loss methods?

How do the different solvent types (ethanol or propanone) and the solvent-water ratios (20%, 40%, 60%, 80%, and 100% v/v) used in Ultrasound-Assisted Extraction (UAE) impact the total phenolic content obtained from rosemary, as measured by the Folin-Ciocalteu assay?

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?

How do methanol, acetone, and ethyl acetate compare in their effectiveness for extracting vanillin from vanilla sugar, based on the purity of the crystals assessed through melting points and TLC analysis?

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 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 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?

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.

How do phenolic acid derivatives obtained from pomegranate peel interact with copper (II) ions as investigated using UV-Visible Spectroscopy?

To what extent do the botanical origin of starch (Potato, Wheat, Rice, Cassava and Corn) and different concentrations of glycerol (5.6×10-5 , 1.7×10- 4 and 2.8×10-4 in moldm-3) contribute to improving the tensile strength (calculated through Young’s Modulus) and biodegradability (tested through soil burial test) of the biodegradable plastic produced?

How does varying the adsorption duration (5, 10, 15, 20, 25, 30 minutes) and eggshell powder adsorbent dosage (0.10, 0.15, 0.20, 0.25, 0.30, 0.35 grams) affect the manganese(VII) ions concentration in wastewater?

How does the amount of bioavailable lycopene in mg per 100 g of tomato pulp change with heat treatment for 15 minutes in 40, 60, 80, and 100 degrees Celsius, investigated with spectrophotometry using wavelengths of length 503 nm?

How does varying steamed or non-steamed vegetables affect the content of iron present, including the effect on an anemic individual’s diet?

How does the concentration of harpagoside, which is identified by the surface area of the spot on the chromatography paper, changes in the equine mane over the period of one month after gradual consumption of the supplement “Devil’s claw”?

Determining the Total Mass Phenolic and the Total Mass Flavonoid Contents of 5 Different Apple Varieties

Which method of determination of the amount of copper in brass yields the most accurate result: iodometric titration, spectrophotometry or potentiometry?

How does 5g of different types of oils (palm oil, avocado oil, castor oil, and olive oil) contribute to the production of soap bars with a pH level closest to 7 measured at constant temperature (50°C) and after constant time of refluxing (30 minutes) through the saponification process?

To what extent does the type of alcohol used in the Fischer-Speier esterification reaction affect the average rate of reaction as measured through back titration.

To What Extent Does The pKa Of Natural Indicators, Isobestic Points And Transmittance Patterns Vary From The pKa Of The Universal Indicator? Analysis By A Spectrophotometer For Finding The Ideal Indicator By Prioritising Its Accessibility (Cost Of Vegetables) And Effectiveness For Agricultural Usage.

How does the type of solvent (ethanol, propanone) and its solvent to water ratio (20%, 40%, 60%, 80%, 100% v/v) in the extraction of polyphenols via Ultrasound-Assisted Extraction (UAE), affect the total phenolic content extracted from rosemary (Rosmarinus officinalis), quantified by Folin-Ciocalteu Assay?

How does the application of different corrosion inhibitors (green tea extract, acrylic paint, chrome plating) on iron affect the amount of rust produced and the rate of corrosion of an iron nail in a 3.5% NaCl solution as measured through spectrophotometric and mass-loss methods?

To what extent does the concentration of sulfuric acid in a lead-acid cell affect the voltage at the end of a discharge cycle and the accumulation of lead sulfate on a lead electrode at standard thermodynamic conditions?

How does varying the solution pH and sodium ethanoate concentration affect the rate and yield of ethane production from its electrolysis?

What effect does changing the concentration of the reagent, Chitosan Glycolate solution, have on the formation rate and the di↵usion coecient observed in the formation of Liesegang rings in the reaction of the Polymer-Analogous Transformation, from salt to base, of Chitosan?

“How quick is the rate of neutralization of 5 cm3, 1 M sodium hydroxide by fatty acids, produced through the hydrolysis of milk fat, catalyzed by lipase enzyme from different seeds?”

Effect of storage temperature and time on the Vitamin C concnetration in citrus fruit juices

How does the concentration of PEG-MME (0, 0.125, 0.25, 0.5, 1.0, 2.0 mg/mL) used to PEGylate AuNPs subjected to equal concentrations of BSA affect the characteristics of the SPR peak (position, height, and width)?

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

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?

How do benzodiazepine chemicals temazepam, triazolam, flurazepam, estazolam and midazolam, in certain anxiolytic and sleep-inducing pills, manipulate neurochemistry and metabolic rates to induce sleepiness and reduce insomnia?

How does the storing time (8 years, 7 months, 5 months, 3 months, 1 month, 1 day) affect the composition of Coca-Cola drinks, considering H3PO4 concentration and sugar content?

How does the yield of synthesis gas obtained from pyrolysis compare to gasification in the chemical recycling of polyethene and polypropene?

What effects does varying the identity and concentration of cation in salt solutions; Sodium chloride, Potassium chloride and Lithium chloride, have on aggregation of silver nanoparticles manufactured through a reduction reaction?

Is the amount of sulfur dioxide in disposable chopsticks a potential health hazard?

Comparison Between the Effects of the Addition of Various Cations via Salt Solution on the Aggregation of Silver Nanoparticles Synthesized via the Reduction Method

an investigation into the chemiluminescence of luminol

To what extent does the Iodine value, and the acid value of the oil, and oxidative stability affect the hydrolysis rate of fatty acids in oil?

What is the effect of varying the amount of CaC03 needed to reverse the effects of acid rain the acidity of soil?"