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In an TLC experiment with paprika, which red spot is capsanthi9n and which is capsorbin? Is it the one that travels the farthest or least? How can You tell?
Why are the paprika pigments colored, while common analgesics, such as aspirin, ibuprofen, acetaminophen, and caffeine, are colorless?
If you were to test racemic ibuprofen by tlc, how many spots would you get after developing the plate? why?
What is the purpose of the gas trap in the reaction set-up? (Hint: What gas(es) are present?What are their safety issues?)
Calculate the amount of heat liberated (in kJ) from 355 g of mercury when it cools from 76.0°C to 13.0°C.
metal was heated to 105.45 °C and then plunged into 100.0 g of water at 23.89 °C. The temperature of the resulting mixture became 27.44 °C.
If 60.0 g of H3PO4 is dissolved in enough water to form 175 mL of solution, what is the molarity (M) of the solution?
How many grams of CH3OH must be added to water to prepare 150mL of a solution that is 2.0 M CH3OH?
The density of lead is 11.3 g/mL. The water level in a graduated cylinder initially at 216 mL rises to 292 mL after a piece of lead is submerged. What is the mass in grams of the lead?
a metal object with a mass of 19g is heated to 96 degrees Celsius, then transferred to a calorimeter containing 75g of water a1 18 degrees Celsius. The water and metal object reach a final temperature of 22 degrees Celsius. What is the specific he..
a titration required 18.38 ml of 0.1574 M NaOH solution. How many moles of NaOH were in this volume?
A mixture of 0.1079 M CO (g) and 0.1079 M H2O(g) was allowed to react and come to equilibrium at some temperature. If Kc = 5.668, what is the equilibrium molar concentration of H2 for the reaction.
If 975g of copper is heated from 20 degrees C to 80 degrees C what amount of heat is absorbed?
Preparing solutions for biochemical experiments, In preparation for a protein purification experiment, you have been asked to prepare 100 mL of an aqueous solution of Tween20
How many grams of copper are in the necklace? 3. If 18-karat gold has a density of 15.5 , what is the volume in cubic centimeters?
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