Investigation of the effect of different types of bread on their standard combustion enthalpy

Finding the rate of the neutralization reaction between 0.5M hydrochloric acid and two different concentrations of sodium bicarbonate (0.23M, 0.46M) at different temperatures (27°C, 32°C, 37°C, 42°C, 47°C) by pH metry, hence determining activation energy in kJ mol-1

How does different current flow in the circuit (0.04, 0.06, 0.08, 0.14, 0.20, 0.24 A) affect the mass of silver metal deposited after 10 minutes using the same 0.250 mol dm-3 concentration of AgNO3 solution in electrolysis process?

How does the different concentration (0.1, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0 M) of 50 mL of Copper(II) Nitrate soluton, Cu(NO3)2 affect the copper, Cu mass deposited on the graphite cathode during 10 minutes of electroplating process for 6 V of power supply.

How does increasing the temperature of water at intervals of 20°C, 40°C, 60°C, 80°C, 100°C affect the amount of caffeine able to be extracted from black tea leaves, measured by mass after undergoing an ethanol based solvent extraction ?

How does steeping green tea leaves at different temperatures (50, 60, 70, 80, 90, 100 °𝐶) for 3 minutes influence its flavonoid concentration (𝑖𝑛 𝑚𝑜𝑙 𝑑𝑚−3), as measured by spectrophotometric analysis, and which temperature achieves the optimal flavonoid extraction?

How does the concentration of C2H5OH(aq) affect its molar enthalpy of combustion?

How does heating different cooking oils (olive oil, sunflower oil, and canola oil) at temperatures of (40°C, 60°C and 80°C) for 30 minutes affect their acid value and free fatty acid content, as determined by acid-base titration?

How does the concentration of acetic acid using titration method in different types of vinegar (balsamic vinegar, apple cider vinegar, guava cider vinegar, pomegranate cider vinegar, rice vinegar, and white vinegar) affect the rate of enamel erosion, as modeled by the dissolution of eggshells?

How does the varying temperature (10°C, 20°C, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C) affect the concentration (mol/L) of citric acid (C6H8O7) in 25ml of store-bought apple juice by acid-base titration with sodium hydroxide (NaOH), by measuring the change in burette reading of sodium hydroxide (NaOH) used for neutralisation of citric acid?

How do different temperatures (20℃, 40℃, 60℃, 80℃, 100℃ ± 0.5℃) affect the relative absorbance of natural fruit dye extracted from frozen blueberries, measured with a spectrometer?

How does the reaction between yeast and different concentrations of sucrose (10%, 20%, 30%, 40%, 50%) affect the rate of carbon dioxide produced which will be measured using gas syringe at regular intervals (10 minutes) over a fixed period (1 hour).

How does the activation energy for the decomposition of hydrogen peroxide vary when using catalase from two different animal livers, as determined from the rate of oxygen gas evolved at temperatures between 20°C and 40°C?

How does varying the concentration of hydrogen peroxide affect the time taken for the iodine clock reaction mixture to turn blue?

How does increasing the concentration of sulfuric acid (0.000 (control), 0.250, 0.500, 0.750, 1.00)M affect the rate of calcium carbonate decomposition (g/s) through measuring the mass loss using a digital balance ±0.005g for 900.00s with a digital stopwatch ±0.01s?

How does varying the concentration of sodium thiosulphate (0.1 M, 0.2 M, 0.3 M, 0.4 M, 0.5 M) affect the rate of reaction in the reaction between sodium thiosulphate and hydrochloric acid, as measured using a spectrophotometer?

What is the effect of change in temperatures (20°C, 30°C, 40°C, 50°C and 60°C (±0.5°C) on the rate constant(k) of a neutralization reaction between hydrochloric acid(HCl) of 1M (±0.05M) and sodium hydroxide (NaOH) of 0.5M (±0.01M), at a constant volume (±0.05cm³), by titration, and calculating the activation energy (E°) kJmol21 of the reaction using Arrhenius' plot?

How does changing the salinity of water by adding 0%, 10%, 20%, 30%, 40%, and 50% of Sodium Chloride affect the amount of dissolved oxygen in water, measured by Winkler's method?

How do different temperatures affect the adsorption of heavy metals ion in a solution by eggshells powder given that the mass of eggshells used, type of egg and concentration of copper ion solution is constant?

To what extent does the average bond length between the central copper atom in complexes with ligands Cl-, OH-, H2O and NH3+ measured in picometres (pm), affect the energy difference of d-orbital splitting (in kJ mol-1), as collected using a Uv-vis spectrophotometer to determine the wavelength at highest absorbance?

How do different temperatures (10℃, 20℃, 30℃, 40℃, 50℃, 60℃) influence the rate of reaction in the iodine clock reaction, as measured by the rate constant (k, in s⁻¹), and how can the activation energy (𝐸a, in J/mol) be determined using the Arrhenius equation?

How does changing the pH (pH 2.34, pH 4.32, pH 7.06, pH 9.98, pH 12.23) of the solution affect the rate of carbon dioxide produced for the breakdown of Corn Starch while using Amylase as a catalyst, determined by the volume (cm3) of carbon dioxide produced?

How does the temperature (8°C, 10°C, 12°C, 14°C, and 16°C) affect the total light output between hydrogen peroxide and luminol measured through the LUX meter over a 25-second period?

How does the concentration of sodium sulfate, a source of a common ion 𝑆𝑂4^2- (0.000, 0.005, 0.010, 0.015, 0.020, 0.025 𝑚𝑜𝑙 𝑑𝑚^-3 ), affect the solubility of calcium (II) sulfate, a sparingly soluble salt, in an aqueous solution due to the Common Ion Effect, as determined by complexometric titration with 0.01 𝑚𝑜𝑙 𝑑𝑚^-3 𝐸𝐷𝑇𝐴?

How does the hardness of water vary among different sources of water as determined by EDTA complexometric titration?

How do different concentration (0.0000 M as control, 0.5000M, 1.0000M, 1.5000M, 2.0000M) values of Carbonic acid, H2CO3, affect the rate of 8-gram Calcium Carbonate, CaCO3, dissolved by measuring the changes in the mass of CaCO3 using digital measuring scale and record the change in turbidity value of the solution using Turbidity metre after 6 days?

How does temperature affect reaction rate for the reaction between sodium bicarbonate and ethanoic acid measured from the rate of change of pressure inside a flask, and what is the activation energy for the reaction?

How do different ratios of Ethanol and 2-Propanol (2%, 20%, 40%, 60% and 80% 2-Propanol) in an Ethanol-2-Propanol mixture affect the enthalpy of combustion as determined by calorimetry?

To what extent does altering the concentration of active ingredient Zinc oxide (9%, 13%, 17%, 21%, 25%) affect the Sun Protection Factor (SPF) of Mineral Sunscreen determined using UV - Visible Spectrophotometry

How do different concentrations of Zinc Sulfate (0.05, 0.10, 0.15, 0.20, 0.25 mol dm-3) at the anode affect the voltage of an electrochemical cell, as predicted by the Nernst equation, when paired with a constant Copper Sulfate concentration (0.05 mol dm-3) at the cathode and connected by a 0.05 mol dm-3 KNO₃ salt bridge?

How does increasing storage time (1, 2, 3, 4, and 5 hours) at room temperature and limited light exposure affect the vitamin C concentration of lemon juice in mol dm-³ as determined by iodometric titration, and what is the order of reaction for degradation of vitamin C that can be deduced from the results?

What is the impact of increasing reactant concentrations (mol dm-3 ) on the rate of light production of luminol? (lx s -1 )

Which one of the following soft drinks: Coca Cola, Pepsi, Cherry Cola, Mirinda, Dr Pepper, is characterised by the highest concentration of phosphoric acid?

How the concentration (mol/dm ) of Ascorbic Acid (Vitamin C) vary in the different types of Citrus fruits of 0.01 dm3 of Citrus limon (Lemons), Citrus reticulata (Mandarins), and Citrus sinensis (Oranges) juices through the Iodometry Method

How do different volumes of 1 mol/dm3 Copper (II) sulfate (CuSO4) solution (0,1,2,3,4 cm3) added to milk affect the fermentation of lactic acid (mol/dm3) over 5 days, as measured by the volume of NaOH solution (mL) required to neutralize the lactic acid produced?

To what extent does the presence of a catalyst (Iron(II) Sulfate, FeSO¤) influence the activation energy (kJ mol{¹) of the iodate variation of the iodine clock reaction, measured by the time taken (s) for blue complex formation across various temperatures (20.0°C, 30.0°C, 40.0°C, 50.0°C, 60.0°C)?

How does the amount of calcium carbonate (CaCO3) in Colgate Maximum Cavity Protection at different temperatures (21°C, 30°C, 40°C, 50°C, 60°C), determined by back titration using HCl and NaOH, vary, and what does this indicate about the thermal stability of CaCO3?

To what extent does MgCl2(aq) concentration (0.1 mol dm-3, 0.05 mol dm-3, 0.01 mol dm-3, 0.001 mol dm-3 , 0 mol dm-3) affect the amount of caffeine (in µg) extracted from 0.500 g coffee (Coffea arabica) grounds extracted with 50.00 g of the solution at 100.0℃ for 120 seconds, determined by UV-Vis spectrophotometry at 277.0 nm of samples prepared using liquid-liquid extraction of 10.00 cm3 coffee solution with ethyl acetate?

To what extent does changing the temperature affect the equilibrium constant between water and cyclohexane and how does it affect the equilibrium constant.

How do different concentrations (0.0500 M, 0.100 M, 0.250 M, 0.500 M, 1.00 M) of NaOH(aq) affect the temperature change of the neutralisation reaction with excess 0.500 M HCl(aq) at room temperature using calorimetry, which was then used to determine the amount of Gibbs free energy in kJ mol-1?