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How do the steeping times (30, 60, 90, 120 and 150 seconds) of tea affect its caffeine content using dichloromethane in a separating funnel?
Chemistry
IA
7
SL
Pro
How does varying the concentration of Iron(III) chloride affect the rate of hydrogen peroxide decomposition?
Chemistry
IA
4
SL
Pro
How will heating lemon juice to different temperatures (60, 70, 80, 90, 100 degrees celsius) affect its concentration of ascorbic acid (vitamin C)?
Chemistry
IA
4
SL
Pro
As determined by the reaction rate constant, which catalyst from baker’s yeast, baking powder, and manganese (IV) oxide is the most effective at catalyzing the decomposition of 3% hydrogen peroxide?
Chemistry
IA
7
HL
Pro
How does temperature (ranging from 10℃ to 50℃) affect the rate of the iodine clock reaction, and what is the relationship between temperature and reaction rate? Specifically, how can the reaction rate be determined from the time taken to reach the blue-black endpoint, and how can this data be analysed using the Arrhenius equation to estimate the activation energy of the reaction?
Chemistry
IA
5
HL
Pro
Investigating The Content of Tannin in Tea Affected by Steeping Time Using a Colorimeter
Chemistry
IA
3
HL
Investigating the Effect of Ionic Charge of Cation towards the Enthalpy of Solution of Salts
Chemistry
IA
5
SL
Pro
Measuring water hardness from different sources of water using EDTA complexation titration
Chemistry
IA
4
SL
Pro
"How does the temperature change (20°C, 40°C, 60°C, 80°C and 100°C) affect calcium concentration (mg) in soya milk, measured by using Ethylenediaminetetraacetic acid (EDTA) Complexometric titration?”
Chemistry
IA
6
SL
Pro
Investigation into how varied temperature (20℃, 30℃, 40℃, 50℃, 60℃, 70℃) affect the bleaching capacity of sodium hypochlorite in removing protein-based stains (egg-yolk) from 100% cotton fabric, measured by the ΔE value obtained using the Color Identifier Colorimeter app?
Chemistry
IA
6
SL
Pro