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IB Chemistry IA Exemplars

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

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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? - Chemistry IA exemplar scored 7

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?

How does temperature (40.0°C, 50.0°C, 60.0°C, 70.0°C, 80.0°C) of the reaction mixture affect the time taken (s) for the cobalt (II) chloride complex’s color change pink to green to pink) as it catalyses the oxidation of tartaric acid by hydrogen peroxide and thus what is the activation energy (kJmol-1) of the reaction? - Chemistry IA exemplar scored 7

How does temperature (40.0°C, 50.0°C, 60.0°C, 70.0°C, 80.0°C) of the reaction mixture affect the time taken (s) for the cobalt (II) chloride complex’s color change pink to green to pink) as it catalyses the oxidation of tartaric acid by hydrogen peroxide and thus what is the activation energy (kJmol-1) of the reaction?

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)? - Chemistry IA exemplar scored 7

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 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? - Chemistry IA exemplar scored 7

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 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 ? - Chemistry IA exemplar scored 6

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? - Chemistry IA exemplar scored 6

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?

“What is the effect of temperature (40.0°C, 50.0°C, 60.0°C, 70.0°C, 80.0°C) on the electroplating of copper in a 0.500 mol dm-3 CuSO4 solution, determined by the change in mass of the carbon cathode, change in absorbance of the electrolyte before and after electrolysis, where theoretical yield was calculated using Faraday’s Law and the non-standard potential was determined using Nernst’s Equation?” - Chemistry IA exemplar scored 6

“What is the effect of temperature (40.0°C, 50.0°C, 60.0°C, 70.0°C, 80.0°C) on the electroplating of copper in a 0.500 mol dm-3 CuSO4 solution, determined by the change in mass of the carbon cathode, change in absorbance of the electrolyte before and after electrolysis, where theoretical yield was calculated using Faraday’s Law and the non-standard potential was determined using Nernst’s Equation?”

¿Cómo varía la velocidad enzimática de la amilasa en función de la temperatura y que relación tienen ambas variables? - Chemistry IA exemplar scored 6

¿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)? - Chemistry IA exemplar scored 6

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? - Chemistry IA exemplar scored 6

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? - Chemistry IA exemplar scored 6

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 - Chemistry IA exemplar scored 6

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. - Chemistry IA exemplar scored 6

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. - Chemistry IA exemplar scored 5

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

How does the absorption of light at specific wavelengths by beetroot juice change when it is mixed with solutions of varying concentrations of NaOH? - Chemistry IA exemplar scored 5

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? - Chemistry IA exemplar scored 5

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?

Investigating the relationship between various catalyst masses and volume of
oxygen gas produced.

How does varying the mass of manganese oxide catalyst (0.05,
0.10, 0.15, 0.20 and 0.25 g) affect the decomposition of 7.5% hydrogen peroxide as
measured by the volume of oxygen gas produced in a time of 30 seconds? - Chemistry IA exemplar scored 5

Investigating the relationship between various catalyst masses and volume of oxygen gas produced. How does varying the mass of manganese oxide catalyst (0.05, 0.10, 0.15, 0.20 and 0.25 g) affect the decomposition of 7.5% hydrogen peroxide as measured by the volume of oxygen gas produced in a time of 30 seconds?

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? - Chemistry IA exemplar scored 5

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?

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

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? - Chemistry IA exemplar scored 5

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

How does varying the concentration of Iron(III) chloride affect the rate of hydrogen peroxide decomposition? - Chemistry IA exemplar scored 4

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

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? - Chemistry IA exemplar scored 4

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 varying wavelengths (nm) emitted by Lumica bracelet glowsticks (380-450 nm (violet), 450-495 nm (blue), 520-530 nm (green), 570-590 nm (yellow), 620-750 nm (red)) affect the activation energy (kJ mol-1) of the chemiluminescent reaction between 0.05 mol dm-3 hydrogen peroxide (H2O2) and 0.08 mol dm-3 phenyl oxalate ester (C14H10O4), determined by plotting the light intensity (lux) of a glowstick 10 minutes after activation as it cools down (348K to 303K), using a light sensor and temperature probe? - Chemistry IA exemplar scored 7

How does varying wavelengths (nm) emitted by Lumica bracelet glowsticks (380-450 nm (violet), 450-495 nm (blue), 520-530 nm (green), 570-590 nm (yellow), 620-750 nm (red)) affect the activation energy (kJ mol-1) of the chemiluminescent reaction between 0.05 mol dm-3 hydrogen peroxide (H2O2) and 0.08 mol dm-3 phenyl oxalate ester (C14H10O4), determined by plotting the light intensity (lux) of a glowstick 10 minutes after activation as it cools down (348K to 303K), using a light sensor and temperature probe?

How does zinc nitrate concentration (Zn (NO3)2), affect instantaneous cell potential (V) of a copper-zinc voltaic cell, according to the Nernst equation? - Chemistry IA exemplar scored 6

How does zinc nitrate concentration (Zn (NO3)2), affect instantaneous cell potential (V) of a copper-zinc voltaic cell, according to the Nernst equation?

Which transition metal catalysts, Copper(II) Sulfate (CuSO4) and Manganese(II) Sulfate (MnSO4), will lower the activation energy (kJ/mol) most for the reaction between Sodium Thiosulfate (Na2S2O3) and Iron(III) Chloride (FeCl3), by measuring the time taken (s) for the reaction to complete and performing Arrhenius plotting analysis at different temperatures of 25°C, 30°C, 35°C, 40°C, and 45°C? - Chemistry IA exemplar scored 6

Which transition metal catalysts, Copper(II) Sulfate (CuSO4) and Manganese(II) Sulfate (MnSO4), will lower the activation energy (kJ/mol) most for the reaction between Sodium Thiosulfate (Na2S2O3) and Iron(III) Chloride (FeCl3), by measuring the time taken (s) for the reaction to complete and performing Arrhenius plotting analysis at different temperatures of 25°C, 30°C, 35°C, 40°C, and 45°C?

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? - Chemistry IA exemplar scored 6

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?

Investigating the Reaction Order of Magnesium and Hydrochloric Acid: Effect of HCl Concentration on Reaction Rate - Chemistry IA exemplar scored 4

Investigating the Reaction Order of Magnesium and Hydrochloric Acid: Effect of HCl Concentration on Reaction Rate

Deducing the order of reaction of degradation of vitamin C/ascorbic acid in Lemon - Chemistry IA exemplar scored 6

Deducing the order of reaction of degradation of vitamin C/ascorbic acid in Lemon

How does the pH of a soft drink (3.05, 2.91, 2.67, 2.79, 2.59) of a phosphoric acid content impact
its de-corrosive abilities on steel, as measured by a pH meter and mass change? - Chemistry IA exemplar scored 6

How does the pH of a soft drink (3.05, 2.91, 2.67, 2.79, 2.59) of a phosphoric acid content impact its de-corrosive abilities on steel, as measured by a pH meter and mass change?

Examining the effect of temperature on the rate of reaction and determining activation energy using the Arrhenius Plot. - Chemistry IA exemplar scored 4

Examining the effect of temperature on the rate of reaction and determining activation energy using the Arrhenius Plot.

Investigating The Content of Tannin in Tea Affected by Steeping Time Using a Colorimeter - Chemistry IA exemplar scored 3

Investigating The Content of Tannin in Tea Affected by Steeping Time Using a Colorimeter

What is the impact of increasing reactant concentrations (mol dm-3) on the rate of light production of luminol? (lx s-1)? - Chemistry IA exemplar scored 5

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

Investigating the effects of temperature on the fading of phenolphthalein in extremely alkaline conditions - Chemistry IA exemplar scored 6

Investigating the effects of temperature on the fading of phenolphthalein in extremely alkaline conditions

How does the temperature of the water affect the solubilities of magnesium salts magnesium dichloride hexahydrate and magnesium nitrate hexahydrate, as measured by the crystallisation temperatures of the solution at manipulated concentrations? - Chemistry IA exemplar scored 6

How does the temperature of the water affect the solubilities of magnesium salts magnesium dichloride hexahydrate and magnesium nitrate hexahydrate, as measured by the crystallisation temperatures of the solution at manipulated concentrations?

How does the volume ratio of ethanol to hexane (1:9, 2:8, 3:7, 4:6, and 5:5) in a mixture affect the amount of energy released per unit mass in combustion? - Chemistry IA exemplar scored 6

How does the volume ratio of ethanol to hexane (1:9, 2:8, 3:7, 4:6, and 5:5) in a mixture affect the amount of energy released per unit mass in combustion?

What is the relationship between the length of a carbon chain of ethanol,
propan-2-ol, butanol and its enthalpy of combustion? - Chemistry IA exemplar scored 5

What is the relationship between the length of a carbon chain of ethanol, propan-2-ol, butanol and its enthalpy of combustion?

$Investigating, how time of ripening (0, 1, 2, 3, 4 days) and external factors (SATP surrounding, wrapping stems in aluminum foil, putting objects in closed paper bag) affect the glucose concentration in bananas (Musa acuminata), using refractometry as a method - Chemistry IA exemplar scored 6$

Investigating, how time of ripening (0, 1, 2, 3, 4 days) and external factors (SATP surrounding, wrapping stems in aluminum foil, putting objects in closed paper bag) affect the glucose concentration in bananas (Musa acuminata), using refractometry as a method

Investigating effect of using different feedstock on the percentage yields and characteristics of biodiesel produced through transesterification of oils and fats - Chemistry IA exemplar scored 4

Investigating effect of using different feedstock on the percentage yields and characteristics of biodiesel produced through transesterification of oils and fats

Determining the rate order of copper sulphate during the oxidation of luminol by
hydrogen peroxide. - Chemistry IA exemplar scored 6

Determining the rate order of copper sulphate during the oxidation of luminol by hydrogen peroxide.

What is the effect of the time of cooking on vitamin C content of potatoes (Solanum tuberosum), measured by titration against an iodine solution? - Chemistry IA exemplar scored 4

What is the effect of the time of cooking on vitamin C content of potatoes (Solanum tuberosum), measured by titration against an iodine solution?

Investigating How Apple Juice Brand Selection Affects Vitamin C Concentration Intake in Relation to Meeting Daily Nutritional Requirements

Investigating the varying temperatures (298.05K, 300.95K, 303.15K, 305.5K, 310.15K, 313.15K) on the rate of reaction of decomposition of sodium thiosulfate with hydrochloric acid by measuring the time (in seconds) taken for formation of a yellow precipitate. - Chemistry IA exemplar scored 5

Investigating the varying temperatures (298.05K, 300.95K, 303.15K, 305.5K, 310.15K, 313.15K) on the rate of reaction of decomposition of sodium thiosulfate with hydrochloric acid by measuring the time (in seconds) taken for formation of a yellow precipitate.

Investigating the decomposition rate of aspirin in different pH environments (pH 2, pH 5, pH 7, pH 9, and pH 12) and its effect on aspirin content using spectrophotometry - Chemistry IA exemplar scored 6

Investigating the decomposition rate of aspirin in different pH environments (pH 2, pH 5, pH 7, pH 9, and pH 12) and its effect on aspirin content using spectrophotometry

To what extent does temperature (10 oC, 25 oC, 50 oC, 80 oC) affect vitamin C (ascorbic acid) concentration in orange juice measured by redox titration - Chemistry IA exemplar scored 5

To what extent does temperature (10 oC, 25 oC, 50 oC, 80 oC) affect vitamin C (ascorbic acid) concentration in orange juice measured by redox titration

What is the effect of temperature on the rate of oxidation of ethanol? - Chemistry IA exemplar scored 5

What is the effect of temperature on the rate of oxidation of ethanol?

Investigating the impact of varying amounts of CaCO3 on the effective removal of Cu2+ ions in solution - Chemistry IA exemplar scored 7

Investigating the impact of varying amounts of CaCO3 on the effective removal of Cu2+ ions in solution

What is the order of reaction with respect to sodium thiosulfate and hydrochloric acid in their reaction, as determined by varying concentrations of each reactant(while the other is kept consistent) and measuring the time taken for sulfur to precipitate, changing the solution from clear to opaque? - Chemistry IA exemplar scored 4

What is the order of reaction with respect to sodium thiosulfate and hydrochloric acid in their reaction, as determined by varying concentrations of each reactant(while the other is kept consistent) and measuring the time taken for sulfur to precipitate, changing the solution from clear to opaque?

What is the relationship between the rate constant (k) and the temperature (293.0, 298.0, 303.0, 308.0, 313.0, 318.0 K) of the reaction between sodium bicarbonate and hydrochloric acid (0.5 moldm-3), and hence, what is the activation energy (kJmol-1) of the reaction? - Chemistry IA exemplar scored 7

What is the relationship between the rate constant (k) and the temperature (293.0, 298.0, 303.0, 308.0, 313.0, 318.0 K) of the reaction between sodium bicarbonate and hydrochloric acid (0.5 moldm-3), and hence, what is the activation energy (kJmol-1) of the reaction?

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