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Use your knowledge of changes of state to explain the following: a) why is spray that evaporates quickly, such as ethyl chloride, used to numb a sports injury during a game? b) why does water in a wide, flat shallow dish evaporate more quickly than the same amount of water in a tall, narrow vase? c) why does a sandwich on a plate dry out faster than a sandwich in plastic wrap?
Explain how a calibration curve could be used to determine an unknown quantity
When o-phthaladehyde is treated with base, o-(hydroxymethyl)benzoic acid is formed. Show the mechanism of this reaction.
Write a net ionic equation for the neutralization reaction of CH3CO2H(aq) with CsOH(aq). 2. Which of the following compounds is an Arrhenius base in water?
Radioactive nitrogen-13 has a half-life of 10 minutes. After 40 minutes, how much of this isotope would remain in a sample that originally contained 96 mg?
How many grams of dry NH4Cl need to be added to 1.80L of a 0.400M solution of ammonia, NH3 , to prepare a buffer solution that has a pH of 8.90? Kb for ammonia is 1.8*10^-5.
At a constant pressure of 1.50 atm what is the enthalpy change delta H for a reaction where the internal eneergy change delta E is 58.0 kJ
Magnesium nitride reacts with liquid water to form insoluble magnesium hyrdroxide and ammonia. What is the balanced equation for such?
After you determine the concentration of the unknown stock solution, you will need to use the density to calculate the % mass of thymol
A compound of a transition metal and iodine is 65.1% metal by mass. How many grams of iodine is present in 859 g of this compound?
calculate the molecular mass of a solute with 8.02 grams of solute in 861 grams of water lower the freezing point to -.430 degree Celsius
a sample of gas has a mass of 38.8 mg. it's volume is 224 mL at a temperature of 55 degrees C and a pressure of 886 torr. Find the molar mass of the gas.
A compound that contains only C and H was burned in excess O2 to give CO2 and H2O. When 0.270 g of the compound was burned, the amount of CO2 formed reacted completely with 20.0 mL of 2.00 M NaOH solution according to the equation:
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