Loading 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
A
Pro
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
A
“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
C
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
B
Pro
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
C
Pro
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
B
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
C
Pro
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
C
Pro
What is the effect of the chain length and structure of alcohols on the mass of carbon from incomplete combustion?
Chemistry
EE
C
Pro
¿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
C
Pro